HIAT2015 - List of Authors (Muramatsu, M.)

Paper	Title	Page
WEPB23	Development of Electron Cyclotron Resonance Ion Sources for Carbon-Ion Radiotherapy	247
	M. Muramatsu National Institute of Radiological Sciences, Chiba, Japan A.G. Drentje, A. Kitagawa NIRS, Chiba-shi, Japan
	Compact ECR ion sources have been developed for high energy carbon-ion radiotherapy (C-ion RT). Three compact ECR ion sources have been developed as the prototype at NIRS. The first ion source was used the microwave of 2.45 GHz to reduce the construction cost of the source as much as possible. This ion source could not obtain enough intensity of C²⁺ because there were problems in microwave injection and beam extraction system. The second and third ion sources, named Kei and Kei2, solved these problems. The structure of Kei and Kei2 were similar, however Kei2 improved on the magnetic field configuration. The beam intensity of 0.26 mA and 0.78 mA for C⁴⁺ were obtained by Kei and by Kei2, respectively. All of later C-ion RT facilities in Japan, the Gunma University Heavy Ion Medical Center, the Saga Heavy Ion Medical Accelerator in Tosu, and the Ion-beam Radiation Oncology Center in Kanagawa, installed copies of Kei2 and named them KeiGM, KeiSA, and KeiGM3. On the other hand, the original Kei2 have been installed in the HIMAC at NIRS and produces carbon beams for experimental use. Developments and some improvements of these Kei-series ECR ion sources will be reported.
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FRM1C02	Research and Developments Toward Radioactive C-11 Ion Acceleration
	K. Katagiri, T. Hattori, S. Hojo, M. Muramatsu, M. Nakao, A. Noda, K. Noda, K. Suzuki, T. Wakui NIRS, Chiba-shi, Japan K. Nagatsu National Institute of Radiological Sciences, Inage, Chiba, Japan
	Funding: This study was partially supported by a JSPS KAKENHI Grant Number 25790090. An isotope Separation On-Line (ISOL) system for radioactive C-11 ion beam acceleration is expected to be realized for a PET imaging simultaneously with the heavy-ion cancer therapy. In the ISOL scheme, C-11 molecules are firstly produced by irradiating boron compound target with proton beams (20 MeV, ~30 μA) provided by a small cyclotron. The C-11 molecules are separated from impurity molecules mixed into the target chamber during the proton irradiation. Then, 1+ ions are firstly produced from the purified C-11 molecules with the singly charged ion source. Finally, after the isotope separation with an analyzing magnet, the C+ ions are further ionized by employing an EBIS as a charge breeder to obtain required charge state for the HIMAC injector.* We have been developed a C-11 molecular production/separation system to produce the C-11 molecules and separate it from the impurities. We have also been developed a new singly charged ion source to produce the 1+ ions. Moreover, a test irradiation port is being constructed at NIRS cyclotron facility for on-line experiments to produce C-11 ions. Latest results on those developments and prospects of our ISOL scheme are to be presented. *Akira Noda, et al., in these proceedings.
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Paper

Title

Page

Development of Electron Cyclotron Resonance Ion Sources for Carbon-Ion Radiotherapy

247

M. Muramatsu
National Institute of Radiological Sciences, Chiba, Japan
A.G. Drentje, A. Kitagawa
NIRS, Chiba-shi, Japan

Compact ECR ion sources have been developed for high energy carbon-ion radiotherapy (C-ion RT). Three compact ECR ion sources have been developed as the prototype at NIRS. The first ion source was used the microwave of 2.45 GHz to reduce the construction cost of the source as much as possible. This ion source could not obtain enough intensity of C²⁺ because there were problems in microwave injection and beam extraction system. The second and third ion sources, named Kei and Kei2, solved these problems. The structure of Kei and Kei2 were similar, however Kei2 improved on the magnetic field configuration. The beam intensity of 0.26 mA and 0.78 mA for C⁴⁺ were obtained by Kei and by Kei2, respectively. All of later C-ion RT facilities in Japan, the Gunma University Heavy Ion Medical Center, the Saga Heavy Ion Medical Accelerator in Tosu, and the Ion-beam Radiation Oncology Center in Kanagawa, installed copies of Kei2 and named them KeiGM, KeiSA, and KeiGM3. On the other hand, the original Kei2 have been installed in the HIMAC at NIRS and produces carbon beams for experimental use. Developments and some improvements of these Kei-series ECR ion sources will be reported.

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FRM1C02

Research and Developments Toward Radioactive C-11 Ion Acceleration

K. Katagiri, T. Hattori, S. Hojo, M. Muramatsu, M. Nakao, A. Noda, K. Noda, K. Suzuki, T. Wakui
NIRS, Chiba-shi, Japan
K. Nagatsu
National Institute of Radiological Sciences, Inage, Chiba, Japan

Funding: This study was partially supported by a JSPS KAKENHI Grant Number 25790090.
An isotope Separation On-Line (ISOL) system for radioactive C-11 ion beam acceleration is expected to be realized for a PET imaging simultaneously with the heavy-ion cancer therapy. In the ISOL scheme, C-11 molecules are firstly produced by irradiating boron compound target with proton beams (20 MeV, ~30 μA) provided by a small cyclotron. The C-11 molecules are separated from impurity molecules mixed into the target chamber during the proton irradiation. Then, 1+ ions are firstly produced from the purified C-11 molecules with the singly charged ion source. Finally, after the isotope separation with an analyzing magnet, the C+ ions are further ionized by employing an EBIS as a charge breeder to obtain required charge state for the HIMAC injector.* We have been developed a C-11 molecular production/separation system to produce the C-11 molecules and separate it from the impurities. We have also been developed a new singly charged ion source to produce the 1+ ions. Moreover, a test irradiation port is being constructed at NIRS cyclotron facility for on-line experiments to produce C-11 ions. Latest results on those developments and prospects of our ISOL scheme are to be presented.
*Akira Noda, et al., in these proceedings.

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)