Updated on 2026/08/07

写真a

 
OKAMURA MASAHIRO
 
Organization
Institute of Integrated Research Laboratory for Zero-Carbon Energy Specially Appointed Professor
Title
Specially Appointed Professor
External link

Papers

▼display all

MISC

  • 短パルスレーザー生成イオンのRF同期加速によるイオン源

    不破康裕, 岩下芳久, 頓宮拓, 井上峻介, 橋田昌樹, 阪部周二, 岡村昌宏, 山崎淳

    日本加速器学会年会(Web)   12th   2015

    　More details

  • 27pGB-1 An ion source using direct injection of short-pulse laser plasma to RF bucket

    Fuwa Yasuhiro, Iwashita Yoshihisa, Tongu Hiromu, Otani Kazuto, Sakabe Shuji, Okamura Masahiro

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   160 - 160   2012.3

    　More details

    Language：Japanese   Publisher：The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • Ion source using laser plasma induced from solid hydrogen

    Tamura Jun, Okamura Masahiro, Kondrashev Sergei, Hayashizaki Noriyosu, Ito Taku, Ishibashi Takuya, Matsunaga Naoko, Hattori Toshiyuki

    Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan   2006   123 - 123   2006

    　More details

    Publisher：Atomic Energy Society of Japan  

    DOI： 10.11561/aesj.2006f.0.123.0

    J-GLOBAL

    researchmap

Industrial property rights

  • イオンビーム引出加速方法及び装置

    柏木 啓次, 岡村 昌宏

    　More details

    Applicant：独立行政法人日本原子力研究開発機構

    Application no：特願2007-198996  Date applied：2007.7

    Announcement no：特開2009-037764  Date announced：2009.2

    Patent/Registration no：特許第4771230号  Date registered：2011.7 

    J-GLOBAL

    researchmap

  • コイルの製造方法及びM型電磁石

    岡村 昌宏, 高野 光司

    　More details

    Applicant：独立行政法人理化学研究所, 有限会社タカノ技研

    Application no：特願2003-358453  Date applied：2003.10

    Announcement no：特開2005-123480  Date announced：2005.5

    Patent/Registration no：特許第4295595号  Date registered：2009.4 

    J-GLOBAL

    researchmap

  • イオン加速装置

    岡村 昌宏, 竹内 猛, 服部 俊幸

    　More details

    Applicant：独立行政法人理化学研究所

    Application no：特願2001-241023  Date applied：2001.8

    Announcement no：特開2003-059699  Date announced：2003.2

    Patent/Registration no：特許第3713524号  Date registered：2005.9 

    J-GLOBAL

    researchmap

Research Projects

  • Neutron generator for BNCT using lithium driver beam

    Grant number：20K20404  2020.4 - 2022.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Pioneering)  Grant-in-Aid for Challenging Research (Pioneering)

    　 More details

    Grant amount：\25740000 （ Direct Cost: \19800000 、 Indirect Cost：\5940000 ）

    researchmap

  • Development of ion source for next generation cancer particle therapy accelearator

    Grant number：15K15215  2015.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    Okamura Masahiro, SAITO YOSHITO, Stifler Cayla, Kanesue Takeshi, Ikeda Shunsuke

    　 More details

    Grant amount：\3770000 （ Direct Cost: \2900000 、 Indirect Cost：\870000 ）

    For realize cancer therapy accelerator which could provide both carbon beam and proton beams, we have studied proton beam production using laser ion source. We had already established high brightness carbon beam production form laser ion source, however proton beam production needed further studies. We employed hydride metal targets. We have tested many material and laser irradiation condition to extract high purity proton beam from hydride metal plasma. Finally we successfully established intense proton beam from zirconium hydride target. We also tested robustness of the target and could measure material consumption rate. Based of the results from the basic experimental work, acceleration test was carried out at an existing user facility at Brookhaven National Laboratory. The performance of proton beam production was demonstrated and verified.

    researchmap

  • Novel Laser Ion Source by Synchronized Injection to RF Bucket

    Grant number：23654085  2011.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    IWASHITA Yoshihisa, SAKEBE Shuji, OKAMURA Masahiro, TONGU Hiromu, HASHIDA Masaki, TOKITA Shigeki, YAMAZAKI Atsushi, INOUE Shunsuke, FUWA Yasuhiro

    　 More details

    Grant amount：\3770000 （ Direct Cost: \2900000 、 Indirect Cost：\870000 ）

    Initially bunched ions extracted from short-pulse-laser induced plasma that is synchronized with the RF acceleration phase can eliminate the buncher section of an RFQ and useful for an advanced accelerator design.
    Among subjects to be solved, the selection of the irradiation target and R&D on the measurement method were the key issues. As to the irradiation target, solid targets, which are easy for handling, produced plasmas with too high densities and no useful results were obtained. Gas jet target was finally chosen and pulse gas valve using a piezoelectric element was fabricated for the experiments.
    With a proper phase relation between laser shot timing and the RF electric field phase, we could observed bunched ions with a probe located close to the production point and succeeded to prove the principle.

    researchmap

  • Demonstration of the next generation of cancer therapy driver

    Grant number：23240082  2011.4 - 2014.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)

    TAKAYAMA Ken, OKAMURA Masahiro, ADACHI Toshikazu, ARAKIDA Yoshio, TKAGI Akira, MATSUMURA Akira, HORIOKA Kazuhiko, OKAMURA Katsuya

    　 More details

    Grant amount：\49400000 （ Direct Cost: \38000000 、 Indirect Cost：\11400000 ）

    It was necessary to develop an fully stripped carbon ion source in order to realize the next generation of carbon therapy, where C-6+ delivered from the ion source are directly injected into an circular accelerator ring and quickly accelerated up to an desired energy. A laser ablation ion source has been successfully demonstrated with a sufficient ion beam quality in a collaboration between KEK and RIKEN BNL-branch. The KEK digital accelerator has been examined as a model accelerator ring to realize the next generation of carbon therapy driver, which does not require any injector system, such as an RFQ, ion linac, and carbon stripper. Tuning of the low energy beam transport, injection system, and ring magnet excitation, and induction acceleration system has been demonstrated from various aspects.
    All results have been published in refereed papers and presented at domestic and international conferences. Five master students have earned their thesis through the related activities.

    researchmap

  • 陽子線・炭素線共用がん治療用小型イオン発生装置の開発

    Grant number：18659356  2006

    日本学術振興会  科学研究費助成事業 萌芽研究  萌芽研究

    岡村 昌宏

    　 More details

    Grant amount：\2100000 （ Direct Cost: \2100000 ）

    researchmap

  • STUDY OF VERY SMALL INJECTOR LINEAR ACCELERATOR WITH DIRECT PLASMA INJECTION SCHEME FOR HEAVYION CANCER THERAPY

    Grant number：17390328  2005 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    HATTORI Toshiyuki, HAYASHIZAKI Noriyosu, OKAMURA Masahiro

    　 More details

    Grant amount：\15300000 （ Direct Cost: \15300000 ）

    An accelerator system of particle cancer therapy was constructed by the accelerator technology of the 20th century. Therefore, the system is large and complex. We tried new accelerator technology of the 21st century for accelerator system of cancer therapy. These new technologies are Direct Plasma Injection Scheme (DPIS), Alternating Phase Focusing (APF) method of drift tube acceleration structure and 3-dimensional analysis of acceleration cavity.
    A laser ion source was studied and developed for gas and solid target. We-succeeded product of high intensity ion by combining a cryogenic-cooler and a YAG laser. The results were contributed and published in international conference and international journal, respectively. We carried out the experiment with Direct Plasma Injection Scheme for APF Interdigital-H (IH) linear accelerator which was designed to accelerate ions with charge to mass ratio (q/A) of 1-1/3 from 40 keV/amu to 2 MeV/amu. We found that the improvement was necessary to realize large acceptance from the result of particle trajectory calculation. In order to decrease the cost of improvement, the liner accelerator cavity was modified as small as possible. In acceleration test in low energy injection, the APF-IH linear accelerator could not to get large acceptance by Direct Plasma Injection Scheme with laser ion source. Therefore, a hybrid single cavity linear accelerator was designed as new conception. A Radio Frequency Quadrupole (RFQ) type having good focusing performance in low energy region and a drift tube type having good acceleration performance in medium energy region were installed in a single cavity. Design study of the hybrid single cavity linear accelerator was contributed and published for International conference and International Journal, respectively.

    researchmap

  • STUDY OF THE APF TYPE COMPACT CANTHER THERAPY SYSTEM

    Grant number：15390358  2003 - 2004

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    HATTORI Toshiyuki, HAYASHIZAKI Noriyosu, KAWASAKI Katsunori, OKAMURA Masahiro, KITAGAWA Atsushi

    　 More details

    Grant amount：\14600000 （ Direct Cost: \14600000 ）

    A RFQ linear accelerator (linac) with Direct Plasma Injection Scheme(DPIS) has been studied to accelerate high intense heavy ion beam for injector of compact cancer therapy system. The DPIS-RFQ buncher linac was designed to confirm characteristics of carbon ions acceleration. Its operating frequency is 100 MHz. The beam test stand with the DPIS-RFQ linac and a CO2 laser ion source was fabricated at National Institute Radiological Science(NIRS). We succeeded to accelerate carbon ions beam of 50mA with the system and established an international record in July 2004. The results were reported in some conferences : International Linear Accelerator conference (Linac2004) in Germany and Particle Accelerator Society in Japan. In order to realize compact heavy ion cancer therapy system the production of full striped carbon ion (C6+) is important. High intense and higher charge state (5+,6+) carbon ions can be produced with a YAG laser ion source. Acceleration test of C6+ ion with the DPIS-RFQ buncher linac has been carried out.
    An APF-IH test linac of acceleration energy 2 MeV/u was developed as the 1/3 scale prototype of real system. The APF-IH linac was accelerated low current proton up to 2 MeV in October 2004. As a result, the combination of RFQ linac and APF-IH linac was adopted in popularization project of heavy ion cancer therapy system at NIRS. Similar project of is in progress at Heidelberg in Germany.

    researchmap

  • Capture of intense heavy ion beams with RFQ electrodes

    Grant number：15360041  2003 - 2004

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    OKAMURA Masahiro, KOSEKI Tadashi, HATTORI Toshiyuki

    　 More details

    Grant amount：\15200000 （ Direct Cost: \15200000 ）

    To capture intense heavy ions in laser plasmas up to a limit of space charge effect in RFQ electrode, experimental and simulation studies have been done. The results enabled us to design a new RFQ electrode which can handle intense carbon 4+ beam and an ion extraction devise from a laser plasma. We are currently in optimization process of the extraction devise and are still improving a maximum current of the highly charged heavy ion production. The latest result shows 65 mA of carbon beam. Our achievements was reported at "linear accelerator conference 2004" in Lubeck, Geramany last August. Our report was focused as new technique of high current heavy ion production at the summary talk in the conference.
    In the experiments, we examined the relationship between the strength of RFQ field and the captured ion current. This results were well explained by the simulations which took the space charge effect and the confinement force of the RFQ field into account. Both the experiment and the simulation showed that the carbon 4+ beam was captured by an inter-vane voltage of 120 kV most efficiently. Also it was found that the inter-vane voltage of 63 kV could only accelerated fully stripped carbon 6+ beam. We established the technique which could induce intense highly charged heavy ions at high purity.
    We also succeeded to extend pulse length of the beam from 1 micro s to 10 micro s using a variation of expanding velocities in the RFQ channel. The longer pulse length will fit to a large size synchrotron accelerators.

    researchmap

  • ガン治療加速器用超小型高出力線形加速器システムの開発

    Grant number：14390013  2002 - 2004

    日本学術振興会  科学研究費助成事業 基盤研究(B)  基盤研究(B)

    片山 武司, 服部 俊幸, 岡村 昌宏, 渡辺 伸一

    　 More details

    Grant amount：\13200000 （ Direct Cost: \13200000 ）

    本年度は、超小型高出力線型加速器システムの核となる、レーザープラズマ発生装置と高強度重イオンRFQ線型加速器用電極の設計・製作を中心として研究を行った。
    レーザープラズマ発生装置用ドライバーとしてヤグレーザーを用い、がん治療に適した炭素イオンビームを発生させる装置を開発した。昨年度行ったプラズマを成型せずRFQ方向への拡散速度を利用してイオンを運ぶ方法に加えて、プラズマに高電場勾配を印可することによって効率良くイオンを引き出す方法について実験を行った。また、新たに設計製作した引き出し電極では必要とされる60kVの絶縁性能を満たすことに成功した。プラズマ発生装置は対地絶縁を取った真空容器中に設置されており、高圧部分が露出しない構造となっている。このためさらに装置が小型化されており、治療装置としても保守容易性に優れている。
    加速電極の設計では、従来に無い低速領域からの高電流ビームを加速するため、最小ボア半径を7mmとし、最適化を行った。この結果、全長150cmの領域で核子当たり20keVから100KeVまで効率良く加速する構造となっている。この結果をもとに共振周波数が100MHzの加速電極を製作し、高周波特性を測定した。電圧分布特性は+-5%以内であり、クオリティーファクター値は約4000を達成した。
    現在、ヤグレーザーを用いたプラズマ発生装置とRFQ線形加速器を用いた加速実験に対する準備が進められている。

    researchmap

▼display all