PAC2013 - List of Authors (Shirai, T.)

Paper

Title

Page

Possible Observation of Transverse Laser Cooled Ultimate Cold Ion Beam in S-LSR*

886

K. Jimbo
Kyoto University, Kyoto, Japan
M. Nakao, A. Noda, T. Shirai
NIRS, Chiba-shi, Japan
H. Souda
Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan
H. Tongu
Kyoto ICR, Uji, Kyoto, Japan
Y. Yuri
JAEA/TARRI, Gunma-ken, Japan

Transverse laser cooling is pursued at an ion storage/cooler ring, S-LSR, Kyoto University. An RF bunched Mg+ beam was cooled transversely through synchro-betatron resonance coupling by a co-propagating laser. We investigated peaks of the synchrotron oscillation spectroscopically so that we can observe it stably. Oscillation signals from a parallel-plate pickup were observed by a spectrum analyzer. We also observed the coherent synchrotron modes. As the beam temperature decreases, the ion beam would be in space charge limited region. According to the computer simulation, in the case the beam turns to be space charge limited, the disappearance of peaks of the synchrotron oscillation is expected. We would like to propose a capability of detecting space charge limited region by observation of such a frozen synchrotron oscillation.

FRXB1

Superconducting Gantry and Other Developments at HIMAC

1463

Y. Iwata, T. Furukawa, Y. Hara, K. Mizushima, T.M. Murakami, K. Noda, S. Sato, T. Shirai, K. Shoda, S.S. Suzuki
NIRS, Chiba-shi, Japan
N. Amemiya
Kyoto University, Kyoto, Japan
H. Arai, T. Fujimoto
AEC, Chiba, Japan
T.F. Fujita
National Institute of Radiological Sciences, Chiba, Japan
Y. Nagamoto, T. Orikasa, S. Takayama, T. Yazawa
Toshiba, Tokyo, Japan
T. Obana
NIFS, Gifu, Japan
T. Ogitsu
KEK, Ibaraki, Japan

New developments at HIMAC include a superconducting carbon gantry, a new therapy area with three new treatment rooms, and substantial enhancements to the synchrotron extraction system to enable energy-variation within a synchrotron cycle to match characteristics of the gantry and three-dimensional raster scanning. This carbon gantry equips ten combined-function superconducting magnets, allowing us to design the compact gantry; the length and the radius of the gantry will be approximately 13 and 5.5 m, respectively, which are comparable to those for the existing proton gantries. Further, these superconducting magnets were designed to provide the fast slew rate of the magnetic field for the energy-variation operation of the synchrotron. The fabrication of the superconducting magnets has been made, and field measurements of the several magnets were performed. In this talk, the design of the superconducting gantry including the magnet design and results of the field measurements will be presented.

Slides FRXB1 [42.104 MB]

Paper	Title	Page
WEPBA02	Possible Observation of Transverse Laser Cooled Ultimate Cold Ion Beam in S-LSR*	886
	K. Jimbo Kyoto University, Kyoto, Japan M. Nakao, A. Noda, T. Shirai NIRS, Chiba-shi, Japan H. Souda Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan H. Tongu Kyoto ICR, Uji, Kyoto, Japan Y. Yuri JAEA/TARRI, Gunma-ken, Japan
	Transverse laser cooling is pursued at an ion storage/cooler ring, S-LSR, Kyoto University. An RF bunched Mg+ beam was cooled transversely through synchro-betatron resonance coupling by a co-propagating laser. We investigated peaks of the synchrotron oscillation spectroscopically so that we can observe it stably. Oscillation signals from a parallel-plate pickup were observed by a spectrum analyzer. We also observed the coherent synchrotron modes. As the beam temperature decreases, the ion beam would be in space charge limited region. According to the computer simulation, in the case the beam turns to be space charge limited, the disappearance of peaks of the synchrotron oscillation is expected. We would like to propose a capability of detecting space charge limited region by observation of such a frozen synchrotron oscillation.

FRXB1	Superconducting Gantry and Other Developments at HIMAC	1463
	Y. Iwata, T. Furukawa, Y. Hara, K. Mizushima, T.M. Murakami, K. Noda, S. Sato, T. Shirai, K. Shoda, S.S. Suzuki NIRS, Chiba-shi, Japan N. Amemiya Kyoto University, Kyoto, Japan H. Arai, T. Fujimoto AEC, Chiba, Japan T.F. Fujita National Institute of Radiological Sciences, Chiba, Japan Y. Nagamoto, T. Orikasa, S. Takayama, T. Yazawa Toshiba, Tokyo, Japan T. Obana NIFS, Gifu, Japan T. Ogitsu KEK, Ibaraki, Japan
	New developments at HIMAC include a superconducting carbon gantry, a new therapy area with three new treatment rooms, and substantial enhancements to the synchrotron extraction system to enable energy-variation within a synchrotron cycle to match characteristics of the gantry and three-dimensional raster scanning. This carbon gantry equips ten combined-function superconducting magnets, allowing us to design the compact gantry; the length and the radius of the gantry will be approximately 13 and 5.5 m, respectively, which are comparable to those for the existing proton gantries. Further, these superconducting magnets were designed to provide the fast slew rate of the magnetic field for the energy-variation operation of the synchrotron. The fabrication of the superconducting magnets has been made, and field measurements of the several magnets were performed. In this talk, the design of the superconducting gantry including the magnet design and results of the field measurements will be presented.
	Slides FRXB1 [42.104 MB]