ECRIS2016 - List of Authors (Muramatsu, M.)

Paper	Title	Page
WEAO03	Practical Comparison of Two-Frequency Heating Phenomena in Different ECR Ion Sources	55
	A. Kitagawa NIRS, Chiba-shi, Japan S. Biri, R. Rácz ATOMKI, Debrecen, Hungary Y. Kato Osaka University, Graduate School of Engineering, Osaka, Japan M. Muramatsu National Institute of Radiological Sciences, Chiba, Japan W. Takasugi AEC, Chiba, Japan
	In order to improve highly-charged ion production from the 18GHz NIRS-HEC ECRIS, our group has studied the mixture of two microwaves of which the frequencies were close together each. Our conclusion was that when an additional microwave is added to the primary microwave, the plasma stability is improved. The output current of the highly charged ion beam was proportional to the total power of both microwaves. The dependence on the additional frequency showed the fine structure. Since this structure depended on the magnetic field, vacuum pressure, and so on, the precise frequency adjustment for maximum output was required under each condition. Our interest is whether the above-mentioned phenomenon can be demonstrated using a different ion source where the two frequencies are even far from each other. We installed a 17.75-18.25 GHz microwave system in addition to the 14.3 GHz klystron amplifier of the ATOMKI ECRIS. Argon output currents at various values of the microwave power and frequency were studied. The dependence on the total power shows the similar tendency as at NIRS. The dependence on the additional frequency also shows the fine structure. Detailed data will be presented.
	Slides WEAO03 [4.648 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-WEAO03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEBO02	Design of Compact ECR Ion Source for C⁵⁺ Production	64
	M. Muramatsu, Y. Iwata, A. Kitagawa, E. Noda, M. Sekiguchi NIRS, Chiba-shi, Japan K. Fukushima, T. Sasano, T. Suzuki, K. Takahashi AEC, Chiba, Japan H. Murata, T. Takahashi SHI, Kanagawa, Japan
	The Heavy Ion Medical Accelerator in Chiba (HIMAC) was constructed as the first medical dedicated heavy ion accelerator facility at National Institute of Radiological Sciences (NIRS). Over 9000 cancer patients have been treated with 140-430 MeV/u carbon beams since 1994. Compact ECR ion source with all permanent magnets, named Kei2, was developed for production of C⁴⁺ ions for medical treatment at NIRS. A compact ECR ion source for Gunma University (Gunma University Heavy Ion Medical Center: GHMC), Saga carbon-ion radiotherapy (Saga Heavy Ion Medical Accelerator in Tosu: SAGA HIMAT) and Kanagawa carbon-ion radiotherapy (Ion-beam Radiation Oncology Center in Kanagawa: i-ROCK) facility has been operated for medical use. It is a copy of the Kei2 which was developed by NIRS. In order to reduce operation cost of the injector for next designed carbon ion facility, we start design of new compact ECR ion source for C⁵⁺ production. Some dependence (mirror field, microwave power and frequency) were checked for optimal parameter of C⁵⁺ production at 18 GHz NIRS-HEC source. Results of experiments and specification of new compact source are described in this presentation.
	Slides WEBO02 [4.046 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-WEBO02
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Practical Comparison of Two-Frequency Heating Phenomena in Different ECR Ion Sources

55

A. Kitagawa
NIRS, Chiba-shi, Japan
S. Biri, R. Rácz
ATOMKI, Debrecen, Hungary
Y. Kato
Osaka University, Graduate School of Engineering, Osaka, Japan
M. Muramatsu
National Institute of Radiological Sciences, Chiba, Japan
W. Takasugi
AEC, Chiba, Japan

In order to improve highly-charged ion production from the 18GHz NIRS-HEC ECRIS, our group has studied the mixture of two microwaves of which the frequencies were close together each. Our conclusion was that when an additional microwave is added to the primary microwave, the plasma stability is improved. The output current of the highly charged ion beam was proportional to the total power of both microwaves. The dependence on the additional frequency showed the fine structure. Since this structure depended on the magnetic field, vacuum pressure, and so on, the precise frequency adjustment for maximum output was required under each condition. Our interest is whether the above-mentioned phenomenon can be demonstrated using a different ion source where the two frequencies are even far from each other. We installed a 17.75-18.25 GHz microwave system in addition to the 14.3 GHz klystron amplifier of the ATOMKI ECRIS. Argon output currents at various values of the microwave power and frequency were studied. The dependence on the total power shows the similar tendency as at NIRS. The dependence on the additional frequency also shows the fine structure. Detailed data will be presented.

Slides WEAO03 [4.648 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-WEAO03

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEBO02

Design of Compact ECR Ion Source for C⁵⁺ Production

64

M. Muramatsu, Y. Iwata, A. Kitagawa, E. Noda, M. Sekiguchi
NIRS, Chiba-shi, Japan
K. Fukushima, T. Sasano, T. Suzuki, K. Takahashi
AEC, Chiba, Japan
H. Murata, T. Takahashi
SHI, Kanagawa, Japan

The Heavy Ion Medical Accelerator in Chiba (HIMAC) was constructed as the first medical dedicated heavy ion accelerator facility at National Institute of Radiological Sciences (NIRS). Over 9000 cancer patients have been treated with 140-430 MeV/u carbon beams since 1994. Compact ECR ion source with all permanent magnets, named Kei2, was developed for production of C⁴⁺ ions for medical treatment at NIRS. A compact ECR ion source for Gunma University (Gunma University Heavy Ion Medical Center: GHMC), Saga carbon-ion radiotherapy (Saga Heavy Ion Medical Accelerator in Tosu: SAGA HIMAT) and Kanagawa carbon-ion radiotherapy (Ion-beam Radiation Oncology Center in Kanagawa: i-ROCK) facility has been operated for medical use. It is a copy of the Kei2 which was developed by NIRS. In order to reduce operation cost of the injector for next designed carbon ion facility, we start design of new compact ECR ion source for C⁵⁺ production. Some dependence (mirror field, microwave power and frequency) were checked for optimal parameter of C⁵⁺ production at 18 GHz NIRS-HEC source. Results of experiments and specification of new compact source are described in this presentation.

Slides WEBO02 [4.046 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-WEBO02

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)