Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

Abstract

In this work, we tested a setup of X-ray fluorescence (XRF) excited by proton-induced quasi-monochromatic X-rays (proton-induced XRF (PIXRF)) as a low-radiation dose analytical technique for precious cultural heritage samples. The low-dose performance of the PIXRF is experimentally assessed in comparison with the performance of a conventional XRF. For this assessment, we prepared test samples, which simulated original Japanese paintings with copper-bearing pigments. By introducing a figure-of-merit, the PIXRF is found to potentially give a better performance in terms of the radiation dose to the sample and the limit of detection, albeit the degraded multi-elemental analytical capability. PIXRF can be a cost-effective method to perform low dose measurements of precious samples, if introduced in an existing PIXE facility.

DOI： 10.1186/s40494-023-00946-z

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Other Link： https://www.nature.com/articles/s40494-023-00946-z

Authorship：Corresponding author   Language：English   Publishing type：Research paper (conference, symposium, etc.)  

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (conference, symposium, etc.)  

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Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

A compact inertial electrostatic confinement (IEC) fusion neutron source was developed. Imaging tests using the cylindrical IEC neutron source were conducted with the indirect imaging plate (IP) method using dysprosium foil and an imaging plate. An array of powder contained in a stainless-steel blade and Cd pins was successfully imaged. To calculate thermal neutron flux of the device, we tested multiple types of IP and IP scanners with the indirect IP method to create a calibration curve, and it was confirmed that dental IP scanners, which are more widely used than industrial ones, can be applied to the indirect IP method.

DOI： 10.1364/ao.447180

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Other Link： https://opg.optica.org/viewmedia.cfm?URI=ao-61-5-1238&seq=0

Authorship：Corresponding author   Language：English   Publishing type：Research paper (conference, symposium, etc.)  

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (conference, symposium, etc.)  

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.physleta.2020.126692

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Plasma Science and Nuclear Fusion Research  

DOI： 10.1585/pfr.15.1206070

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical Engineers of Japan (IEE Japan)  

DOI： 10.1541/ieejfms.140.464

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Cambridge University Press (CUP)  

Abstract

Flux waveforms of aluminum cluster beams supplied from a laser-ablation cluster source were precisely investigated under various source conditions such as background pressure, ablation laser intensity, and nozzle structure. A time-of-flight mass spectroscopy revealed that aluminum clusters with sizes up to 200 were generated and the amount of the clusters could be maximized by choosing a proper background pressure (~2 MPa) and an ablation laser fluence (~40 mJ/cm²). Flux waveforms of clusters having specific sizes were carefully reconstructed from the observed mass spectra. It is found that the pulse widths of the aluminum cluster beams were typically about 100 µs and much smaller than that of the monoatomic aluminum beam, indicating that the cluster formation was limited in a relatively small volume in the laser-ablated vapor. Introducing a conical nozzle having a large open angle was also found to enhance the cluster beam velocity and reduce its pulse width. A velocity measurement of particles in the cluster beam was conducted to examine the velocity spread of the supplied clusters. We found that the aluminum clusters were continuously released from the source for about 100 µs and this release time mainly determined the pulse width of the cluster beam, suggesting that controlling the behavior of an ablated vapor plume in the waiting room of the cluster source holds the key to drastically improving the cluster beam flux.

DOI： 10.1017/s0263034619000594

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (conference, symposium, etc.)  

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (conference, symposium, etc.)  

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (conference, symposium, etc.)  

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1585/pfr.13.2406075

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Language：Japanese   Publishing type：Research paper (scientific journal)  

J-GLOBAL

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Author(s)  

DOI： 10.1063/1.5053271

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.egypro.2017.09.458

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (conference, symposium, etc.)  

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (conference, symposium, etc.)  

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (conference, symposium, etc.)  

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1063/1.4986085

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Plasma Science and Nuclear Fusion Research  

DOI： 10.1585/pfr.12.1201014

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical Engineers of Japan  

DOI： 10.1541/ieejpes.137.344

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DOI： 10.1063/1.4955330

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DOI： 10.1088/1742-6596/717/1/012101

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Other Link： http://stacks.iop.org/1742-6596/717/i=1/a=012101?key=crossref.ff54d5080883c73a0656e490a473a57e

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DOI： 10.1088/1742-6596/688/1/012097

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Other Link： http://stacks.iop.org/1742-6596/688/i=1/a=012097?key=crossref.2908a9744dc23f83e4901d9fd829b55c

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DOI： 10.1109/tps.2015.2513016

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DOI： 10.1063/1.4927772

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical Engineers of Japan  

DOI： 10.1541/ieejfms.135.366

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DOI： 10.1016/j.egypro.2014.11.879

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DOI： 10.1016/j.egypro.2014.11.876

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DOI： 10.1016/j.egypro.2014.11.877

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Cambridge University Press (CUP)  

Abstract

As a method to evaluate high-temperature equation of state (EOS) data of fissile materials precisely and safely, we numerically examined an experimental setup based on a sub-range fissile target and a high-intensity short-pulsed heavy-ion beam. As an example, we calculated one-dimensional hydrodynamic motion of a uranium target with ρ = 0.03ρ_solid(ρ_solid ≡ solid density = 19.05 g/cm³) induced by a pulsed²³Na⁺beam with a duration of 2 ns and a peak power of 5 GW/mm². The projectile stopping power was calculated using a density- and temperature-dependent dielectric response function. To heat the target uniformly, we optimized the experimental condition so that the energy deposition could occur almost at the top of the Bragg peak. The energy deposition inhomogeneity could be reduced to ±5% by adjusting the incident energy and the target thickness to be 2.02 MeV/u and 180 μm, respectively. The target could be heated homogeneously up tokT=7 eV well before the arrival of the rarefaction waves at the center of the target. In principle, the EOS data can be evaluated by iteratively adjusting the data embedded in the hydro code until the measured hydrodynamic motion is reproduced by the calculation. This method is consistent with the conditions of nuclear nonproliferation, because a very small amount of fissile material is enough to perform the experiment, and no shock compression occurs in the target.

DOI： 10.1017/s0263034614000706

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.nimb.2013.12.043

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DOI： 10.1016/j.nima.2013.05.105

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.nima.2013.05.098

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DOI： 10.1016/j.nima.2013.05.088

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DOI： 10.1016/j.nima.2013.05.104

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Language：English   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

CiNii Books

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1063/1.4773102

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：World Scientific Pub Co Pte Lt  

Two different kinds of metallic plates on a rotating disk target were irradiated with a MeV proton beam, and quasi-monochromatic pulsed X-rays with different energies around the absorption edge of the contrast medium were alternately produced. By using these dual-energy X-rays and a high-sensitivity X-ray movie camera, we took a motion picture of the transmission image of a periodically moving phantom, which simulated a rat heart as a test animal. We found that the enhanced movie imaging of the contrast agent is available by subtraction between adjacent picture frames.

DOI： 10.1142/s0129083513400032

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

CiNii Books

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Language：Japanese  

CiNii Books

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：World Scientific Pub Co Pte Lt  

In this paper, we have proposed monochromatic X-ray microbeams, produced by a proton-induced X-ray technique and a polycapillary X-ray half lens, as a tool for micro-X-ray fluorescence (XRF) analysis. A 30 μm thick planar Cu target was irradiated by a 2.5 MeV proton beam to produce Cu Kα X-rays (8.0 keV), and a polycapillary X-ray half lens was utilized to focus the X-rays emitted behind the Cu target. The focal spot size of the focused X-ray beam was 250 μm at full width at half maximum, which was verified using a knife-edge scanning method. The output focal distance and the depth of focus of the optics were measured to be 47 mm and 1 mm, respectively. A square grid pattern of Co thin films, formed on a thick Cu substrate by thermal evaporation, was used as a test sample for evaluation of the analytical performance of the micro-XRF setup. Two-dimensional mapping of the Co distribution on the Cu substrate was successful, and the spatial resolution was consistent with the beam spot size. For this Co layer, a minimum detection limit of 2.3 ng was achieved.

DOI： 10.1142/s0129083513400019

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

CiNii Books

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1585/pfr.8.1206005

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.nimb.2011.10.008

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DOI： 10.1016/j.nimb.2011.04.083

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.nimb.2011.04.073

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1063/1.3624617

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/xrs.1329

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DOI： 10.2174/1876534301003010080

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Publishing type：Research paper (international conference proceedings)  

DOI： 10.1063/1.3399247

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：World Scientific Pub Co Pte Lt  

A precise target positioning system based on a laser position sensor was developed for a high-efficiency wavelength dispersive PIXE analysis. The absolute position and the target surface profile were clearly observed using this position sensor, which was rigidly connected to the target vacuum chamber. By using a thin proton beam ( width = 2 mm ) and a small target (width = 1 mm), the optimum target position for the measurement of chlorine ( Cl ) Kβ X-ray could be determined from X-ray detection yields measured at various target positions. We found that the relationship between the X-ray detection yield and the target position can be explained by the target size as well as the incident proton beam width. After precise adjustment of the target position using the above system, target samples with two different Cl compounds, NaCl and NH ₄ Cl , were successfully distinguished from the difference in the measured profiles of Kβ X-ray spectra.

DOI： 10.1142/s0129083510001902

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：World Scientific Pub Co Pte Lt  

A precise target positioning system based on a laser position sensor was developed for a high-efficiency wavelength dispersive PIXE analysis. The absolute position and the target surface profile were clearly observed using this position sensor, which was rigidly connected to the target vacuum chamber. By using a thin proton beam ( width = 2 mm ) and a small target (width = 1 mm), the optimum target position for the measurement of chlorine ( Cl ) Kβ X-ray could be determined from X-ray detection yields measured at various target positions. We found that the relationship between the X-ray detection yield and the target position can be explained by the target size as well as the incident proton beam width. After precise adjustment of the target position using the above system, target samples with two different Cl compounds, NaCl and NH ₄ Cl , were successfully distinguished from the difference in the measured profiles of Kβ X-ray spectra.

DOI： 10.1142/s0129083510001902

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.sab.2009.11.001

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DOI： 10.1016/j.nima.2009.03.227

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.nima.2009.03.102

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/xrs.1145

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DOI： 10.1002/xrs.1147

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：World Scientific Pub Co Pte Lt  

Concerning the PIXE analysis of Cr ( VI ) in water using ion-exchange filters, the limit of detection (LOD) and the influence of matrix anions were investigated. In order to look for the experimental condition for obtaining the minimum LOD, we measured the Cr - K α X-ray counts and background counts under the K α X-ray peak as a function of the incident proton energy and the thickness of the Mylar absorber foil in front of the detector. To investigate the interference by coexisting anions, each of PO ₄^3-, SO ₄^2-, NO ₃^-, Cl ^-, and F ^- ions and Cr ( VI ) ions were mixed in aqueous solutions and adsorbed on DE81-DEAE cellulose paper, a weakly basic anion exchanger with diethylaminoethyl functional groups. Then the filter samples were measured by PIXE using 2.5 MeV proton beams. We obtained a LOD of 0.16 µg or 8 ppb for 20 mL samples at a proton energy of 2.5 MeV and a Mylar film thickness of 50 or 100 µm. The experimental results on the mixed solutions indicated that NO ₃^-, Cl ^-, and F ^- as coexisting ions didn't interfere significantly with determination of a 50 µ g / L Cr ( VI ) concentration for 40 mL total solution volume, despite the total amount of anions was about 90% of ion exchange capacity of a filter. On the other hand, slight interferences by PO ₄^3- ions were observed. However, under the same condition, we found that if the total amount of SO ₄^2- ions was higher than 20% of ion exchange capacity, they induced significant interferences in determining Cr ( VI ).

DOI： 10.1142/s0129083509001680

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：World Scientific Pub Co Pte Lt  

Chemical state changes of phosphorus induced by proton irradiation were measured by a high-resolution wavelength-dispersive (WD) PIXE system. Six standard samples of phosphorus with different chemical states ( Ca ( H ₂ PO ₄)₂• H ₂ O ( P ⁵⁺), CaHPO ₄•2 H ₂ O ( P ⁵⁺), NaH ₂ PO ₄ ( P ⁵⁺), CaHPO ₃• H ₂ O ( P ³⁺), Ca ( H ₂ PO ₂)₂ ( P ¹⁺), and NaH ₂ PO ₂• H ₂ O ( P ¹⁺)) were prepared for the measurements. The P - K α₁ peak energy for the sample of P ³⁺ increased after the irradiation. The peak energy of the P ³⁺ sample became nearly same as that of P ⁵⁺ after irradiation with more than 2 ×10⁷ Gy . This result indicates that P ³⁺ in the sample has changed to P ⁵⁺ due to proton irradiation. On the other hand, the P - K α X-ray spectra for the samples of P ⁵⁺ didn't show any interesting changes even for much higher proton dose (3.4 × 10⁸ Gy ). Also, P - K α peaks which correspond to chemical states ( P ⁵⁺ and P ^3-) other than original state were observed for the sample of P ¹⁺ in the region of more than 10⁷ Gy .

DOI： 10.1142/s0129083509001692

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Other Link： http://orcid.org/0000-0002-0489-6065

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Informa UK Limited  

DOI： 10.1080/18811248.2008.9711458

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.nimb.2008.03.006

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DOI： 10.1016/j.nimb.2008.02.056

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.nimb.2008.02.051

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DOI： 10.1016/j.pnucene.2007.11.047

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：World Scientific Pub Co Pte Lt  

The most important species of chromium (VI) formed in water are anions such as CrO ₄^2-, whereas chromium (III) is mainly present in the form of cationic species such as Cr ( OH )₂⁺. Pure water and tap water samples were artificially contaminated with mixture of chromium (VI) and chromium (III) standard solutions. Sequential filtration through commercially available Whatman P81 cellulose phosphate paper and Whatman DE81 DEAE cellulose paper was employed for separation and preconcentration of chromium (III) and chromium (VI) in these water samples, respectively. The PIXE measurements of these filter paper samples were performed using 2-MeV proton beams delivered by a tandem pelletron accelerator at Research Laboratory for Nuclear Reactors, Tokyo Tech. The beam current and the measuring time for each sample were 1 nA and 10 minutes, respectively. Instrumental detection limits were 60 ng for chromium (VI) and 120 ng for chromium (III). Detectable range for chromium (VI) and chromium (III) in water were ≧ 10 ppb and ≧ 50 ppb, respectively. For chromium (VI), the detectable range was considerably lower than the maximum allowed concentration of 50 ppb for chromium (VI) in both the drinking water standards and the environmental quality standards in many countries.

DOI： 10.1142/s0129083508001296

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：AIP Publishing  

To observe nonlinearity in the stopping power of a nonideal plasma for heavy ions, we are planning a beam-plasma interaction experiment using 10−100 keV∕u projectiles. For the interaction experiment, a nonideal hydrogen plasma target was developed by means of a shock technique. Time-resolved spectroscopic measurements determined the temporal evolution of the electron density and temperature of the shock plasma. These data revealed that the structure behind the shock front has an appropriate spatial and temporal distribution to be used as a target. We also evaluated the temporal evolution of the Coulomb coupling constant and the degree of ionization at a fixed position where the projectiles are injected. We discuss the feasibility of the nonlinear stopping experiment by evaluating the beam-plasma coupling constant expected from the measured plasma parameters.

DOI： 10.1063/1.2812431

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：AIP Publishing  

We have developed a high-efficiency high-resolution particle-induced x-ray emission (PIXE) system employing a von Hamos–type crystal spectrometer for a chemical state identification of trace elements in environmental samples. The energy resolution of the system was determined to be about 0.05% through the observation of SiKα1,2 x rays (1.74keV) from elemental silicon. The throughput efficiency of the system was also evaluated quasitheoretically to be 1.6×10−7 counts/incident proton for SiKα1,2 emission. To demonstrate a chemical state analysis using the high-resolution PIXE system, SiKα1,2 and Kβ x-ray spectra for SiC, Si3N4, and SiO2 were measured and compared. The observed chemical shifts of the SiKα1,2 peaks for SiC, Si3N4, and SiO2 relative to elemental silicon were 0.20, 0.40, and 0.55eV, respectively. The tendency of these shifts were well explained by the effective charges of the silicon atoms calculated by a molecular orbital method.

DOI： 10.1063/1.2756623

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DOI： 10.1016/j.nima.2007.02.066

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DOI： 10.1016/j.nima.2007.02.065

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DOI： 10.1016/j.nima.2007.02.007

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DOI： 10.1016/j.nima.2007.02.009

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.nima.2007.02.034

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.nima.2007.02.067

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：World Scientific Pub Co Pte Lt  

Characteristic-line radiation from heavy metal targets bombarded by MeV proton beams has been tested as an X-ray source for dual-energy K-edge subtraction imaging for human angiography (blood vessel imaging) based on iodinated contrast media. To utilize the strong absorption by iodine (Z = 53) at its K-absorption edge (33.2 keV), we used K _α-line of La (lanthanum, Z = 57) at 33.4 keV. As a reference, also K _α X emission of Sn (tin, Z = 50) at 25.2 keV was employed. Metallic plates of La and Sn were irradiated by 7-MeV protons to produce these characteristic X-rays. Energy-subtraction method was tested using Lucite phantoms which contain aqueous solutions of KI (potassium iodide) with different concentrations. Also Ca ( H ₂ PO ₄)₂ powder was stuffed in these phantoms to simulate bones. The transmission images of the phantoms were recorded on imaging plates. During the exposure, the energy spectra of the X-rays were monitored by a CdTe detector. We found that the contrast of images of iodide solutions taken with La X-rays was higher than that with Sn X-rays. Also the energy subtraction procedure was successfully applied to reduce the graphical noise due to the bones and inhomogeneity of the soft tissue. However, to apply the present method to actual clinical use, the X-ray intensity must be increased by several orders of magnitude. Also the transmission of the “lower-energy” photons has to be a few orders higher for imaging of objects as thick as human chest.

DOI： 10.1142/s0129083507001058

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

DOI： 10.1103/physrevstab.8.060401

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Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevSTAB.8.060401/fulltext

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.nima.2005.01.196

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Informa UK Limited  

DOI： 10.1016/j.stam.2004.03.010

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：World Scientific Pub Co Pte Lt  

Thick-target PIXE analysis was applied to the study of electrokinetic soil remediation technique. In order to simulate radioactive soil contamination by ¹³⁷ Cs , salt of stable cesium was mixed with soil samples. These soil samples were subjected to electrolysis for up to 36 hours with a field gradient of ≈ 1-3 V/cm. After the electrolysis, we measured the distribution of Cs concentration in the soil along the electrolysis cell by PIXE analysis. LX-rays of cesium were used for the analysis. The Cs concentrations in the drain water sampled from the cathode well were also evaluated. After the electrolysis the migration of cesium from the anode to the cathode was clearly observed. Water supply into the anode well enhanced the removal rate. We found that the main driving force of the migration of Cs ⁺ observed in this work was not electrophoretic migration, but electroosmotic flow in the soil samples. Owing to the spectral interference by major metallic elements in the soil, the minimum detectable concentration of cesium by the present method was limited to ≈ 800 ppm.

DOI： 10.1142/s0129083504000094

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DOI： 10.1016/j.stam.2004.03.010

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

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DOI： 10.1143/jjap.42.5367

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1017/s0263034602211027

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DOI： 10.1017/S0263034603214233

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Cambridge University Press (CUP)  

Activities of research and development on repetitive induction voltage modulators in the Tokyo Institute of Technology–High Energy Accelerator Research Organization group are presented along with a discussion of the magnetic response of ferro-magnetic materials to fast magnetization and a transient beam loading in the modulators. The modulator is composed of independently driven modules switched by field effect transistors. To make waveform control, the induced voltages are stacked and synthesized in the induction unit. A proof-of-principle experiment shows that the module elements are successfully operated up to megahertz levels with good reproducibility. For the evaluation of magnetic core response, magnetic characteristics are investigated over a wide range of parameters, and an empirical core loss scaling is derived at minor-hysteresis loops. Using the prototype induction module, we have also investigated the effect of beam loading. Results indicate that the effect depends not only on the impedance of the driving circuit but on nonlinearity of the magnetic-core response. This means that the response of the induction modulator depends on the time scale of domain motion and operating point in the B-H plane of magnetic materials. Based on the progress of the component technology in the induction accelerator and database of magnetic materials, a system design has been developed.

DOI： 10.1017/s0263034602204243

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1017/s0263034602203237

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1063/1.1433175

Web of Science

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Language：English   Publishing type：Research paper (conference, symposium, etc.)  

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/s0168-9002(01)00039-0

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/s0168-9002(01)00038-9

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/s0168-9002(01)00046-8

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/s0168-9002(01)00145-0

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/s0168-9002(01)00040-7

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/s0168-9002(01)00010-9

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)  

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：World Scientific Pub Co Pte Lt  

In order to study the influence of motor vehicles on a local soil environment, depth profiles of elemental concentration of urban roadside soil were investigated by means of thick-target PIXE analysis. For comparison, we analyzed the soil sampled in a university campus with very low traffic intensity. From the measured depth profiles, it was found that the roadside surface layers up to the depth of approximately 5 cm from the ground level are highly polluted by S and Zn. According to cluster analysis this pollution can be attributed to the deposition of tire dust due to the heavy vehicular traffic volumes on the highways.

DOI： 10.1142/s0129083501000128

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1017/s0263034600184083

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/S0168-583X(99)00814-9

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/s0168-583x(99)00814-9

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/s0168-583x(99)00935-0

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Authorship：Lead author,　Corresponding author   Language：English   Publisher：Elsevier BV  

DOI： 10.1016/s0168-583x(99)00985-4

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：AIP Publishing  

We have developed a high-current laser ion source that can provide low-charge-state ions for induction accelerators. A frequency-doubled Nd:YAG laser (λ=532 nm) irradiated a copper target with relatively low intensities of 108–109 W/cm2. The laser-produced plasma supplied a large number of Cu+ and Cu2+ ions over 1014 ions/cm2 at a distance of 10 cm from the target. We have successfully extracted high-current copper beams over 0.1 A/cm2 using an inductive acceleration module. The beam emittance measured by a pepper-pot method was about 40 πmm mrad. © 2000 American Institute of Physics.

DOI： 10.1063/1.1150437

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

DOI： 10.1103/physrevlett.84.39

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Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.84.39/fulltext

Language：English   Publishing type：Research paper (scientific journal)   Publisher：World Scientific Pub Co Pte Lt  

In order to study influence of automobile traffic on a local urban atmospheric environment, we have investigated suspended particulate matter (SPM) collected at sampling sites in a region which includes a major highway and a residential area in the southern part of Tokyo during August - November 1999. The atomic composition of each sample was measured by means of PIXE analysis using a 2.0 MeV proton beam. Sixteen elements were quantitatively measured. The positional dependence of SPM loading was determined for each element using samples simultaneously collected at three different sites. For the experimental results obtained for downwind conditions, the measured concentration as a function of the distance from the highway was compared with a simple calculation based on the Gaussian plume model. The concentration distribution of some heavy elements in the fine fraction is well reproduced by this analysis. It has been found that for ordinary moderate downwind conditions the area within 300-400 m from the highway is directly affected by emission due to the automobile traffic.

DOI： 10.1142/s0129083500000183

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DOI： 10.1016/S0168-583X(99)00935-0

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Informa UK Limited  

DOI： 10.1080/18811248.1999.9726215

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/s0920-3796(98)00347-0

Web of Science

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DOI： 10.3327/jnst.36.326

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/s0168-9002(98)00397-0

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1143/jjap.37.3530

Web of Science

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Other Link： https://iopscience.iop.org/article/10.1143/JJAP.37.3530/pdf

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/beams.1998.817004

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Authorship：Lead author   Language：Japanese   Publishing type：Doctoral thesis  

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Authorship：Lead author   Language：English   Publishing type：Research paper (conference, symposium, etc.)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1063/1.50383

Web of Science

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Authorship：Lead author  

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Authorship：Lead author   Language：English   Publishing type：Research paper (conference, symposium, etc.)  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：The Japan Society of Plasma Science and Nuclear Fusion Research  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：プラズマ核融合学会  

J-GLOBAL

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Publishing type：Rapid communication, short report, research note, etc. (bulletin of university, research institution)  

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Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution)  

DOI： 10.11484/jaeri-review-2004-025

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Language：English   Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution)  

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Event date： 2025.12

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2025.9

Language：English   Presentation type：Poster presentation  

Venue：Oxford   Country：United Kingdom  

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Event date： 2025.6

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Sendai   Country：Japan  

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Event date： 2025.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：函館   Country：Japan  

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Event date： 2025.6

Presentation type：Oral presentation (general)  

Venue：函館   Country：Japan  

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Event date： 2025.1

Language：English   Presentation type：Poster presentation  

Venue：Tokyo   Country：Japan  

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Event date： 2025.1

Language：English   Presentation type：Poster presentation  

Venue：Tokyo   Country：Japan  

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Event date： 2025.1

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

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Event date： 2025.1

Presentation type：Oral presentation (general)  

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Event date： 2025.1

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2025.1

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2024.11

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2024.11

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2024.11

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2024.11

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2024.11

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2024.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2024.3

Presentation type：Oral presentation (general)  

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Event date： 2024.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2023.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2023.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2023.9

Language：English   Presentation type：Poster presentation  

Venue：Victoria   Country：Canada  

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Event date： 2023.3

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2023.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京  

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Event date： 2023.1

Language：English   Presentation type：Poster presentation  

Venue：Tokyo  

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Event date： 2023.1

Language：English   Presentation type：Poster presentation  

Venue：Tokyo   Country：Japan  

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Event date： 2022.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2022.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2022.11

Presentation type：Poster presentation  

Country：Japan  

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Event date： 2022.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2022.1

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2022.1

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2021.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2021.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2021.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2021.7

Language：English   Presentation type：Poster presentation  

A compact inertial electrostatic confinement (IEC) fusion neutron source was developed. Imaging tests using the novel IEC neutron source were conducted with the indirect method using dysprosium foil and an imaging plate.

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Event date： 2020.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2020.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2020.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2020.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2019.12

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Kyoto   Country：Japan  

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Event date： 2019.5

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2019.2

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：New Delhi   Country：India  

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Event date： 2019.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2019.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2018.12

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2018.12

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2018.12

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2018.12

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2018.8

Language：English   Presentation type：Poster presentation  

Venue：Daejeon   Country：Korea, Republic of  

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Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

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Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡  

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Event date： 2017.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2017.12

Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2017.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2017.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2017.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2017.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2017.10 - 2017.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

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Event date： 2017.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Osaka   Country：Japan  

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Event date： 2017.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Osaka   Country：Japan  

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Event date： 2017.10

Language：English   Presentation type：Poster presentation  

Venue：Geneva   Country：Switzerland  

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Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2017.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都   Country：Japan  

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Event date： 2017.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Yokohama   Country：Japan  

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Event date： 2017.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2017.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2017.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2017.1

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2016.11 - 2016.12

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2016.11 - 2016.12

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2016.11 - 2016.12

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2016.11 - 2016.12

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2016.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

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Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2016.9

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2016.7

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2016.7

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2016.3

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：つくば   Country：Japan  

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Event date： 2016.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2016.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2016.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2016.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2015.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2015.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2015.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2015.10

Language：English   Presentation type：Oral presentation (general)  

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Event date： 2015.10

Language：English   Presentation type：Oral presentation (general)  

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Event date： 2015.9

Language：English   Presentation type：Poster presentation  

Venue：Seattle   Country：United States  

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Event date： 2015.9

Language：English   Presentation type：Poster presentation  

Venue：Seatle   Country：United States  

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Event date： 2015.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2015.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2015.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2015.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2014.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2014.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：新潟   Country：Japan  

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Event date： 2014.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2014.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2014.9

Language：English   Presentation type：Poster presentation  

Venue：Kumamoto   Country：Japan  

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Event date： 2014.9

Language：English   Presentation type：Poster presentation  

Venue：Kumamoto   Country：Japan  

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Event date： 2014.9

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2014.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：平塚   Country：Japan  

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Event date： 2014.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：相模原   Country：Japan  

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Event date： 2014.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2014.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2013.11

Language：English   Presentation type：Poster presentation  

Venue：Tokyo  

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Event date： 2013.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

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Event date： 2013.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

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Event date： 2013.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

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Event date： 2013.9

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2013.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：八戸   Country：Japan  

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Event date： 2013.8

Language：Japanese  

Venue：神戸   Country：Japan  

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Event date： 2013.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：長岡   Country：Japan  

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Event date： 2013.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：長岡   Country：Japan  

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Event date： 2013.3

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2013.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐  

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Event date： 2013.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2013.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐  

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Event date： 2013.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐  

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Event date： 2013

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐  

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Event date： 2012.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

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Event date： 2012.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

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Event date： 2012.9

Language：Japanese  

Venue：東広島   Country：Japan  

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Event date： 2012.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2012.8

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Berkeley   Country：United States  

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Event date： 2012.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Berkeley   Country：United States  

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Event date： 2012.8

Language：English   Presentation type：Poster presentation  

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Event date： 2012.8

Language：English   Presentation type：Poster presentation  

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Event date： 2012.8

Language：English   Presentation type：Oral presentation (general)  

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Event date： 2012.8

Language：English   Presentation type：Poster presentation  

Venue：Berkeley   Country：United States  

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Event date： 2012.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：土岐   Country：Japan  

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Event date： 2012.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：西宮   Country：Japan  

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Event date： 2012.3

Language：English   Presentation type：Oral presentation (general)  

Venue：Fukui   Country：Japan  

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Event date： 2011.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2011.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：小倉   Country：Japan  

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Event date： 2011.7

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：奈良   Country：Japan  

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Event date： 2011.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2011.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

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Event date： 2010.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Uji   Country：Japan