PAC2013 - List of Authors (Souda, H.)

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.

THPHO01	Parameter Optimization for Multi-Dimensional Laser Cooling for an Ion Beam in the Storage Ring S-LSR	1298
	Z.Q. He TUB, Beijing, People's Republic of China K. Jimbo Kyoto University, Kyoto, Japan M. Nakao, A. Noda NIRS, Chiba-shi, Japan H. Okamoto, K. Osaki HU/AdSM, Higashi-Hiroshima, Japan H. Souda Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan J. Wei FRIB, East Lansing, USA Y. Yuri JAEA/TARRI, Gunma-ken, Japan
	Funding: Advanced Compact Accelerator Development project, MEXT, Japan. GCOE project, Kyoto University, Japan. Abstract: S-LSR is a compact ion cooler ring built in ICR, Kyoto University, aiming at creating ultra-low temperature ion beam by laser cooling. In order to approach lowest possible temperature at S-LSR in an experiment, parameters of laser cooling should be carefully chosen by simulation. This paper mainly concerns on optimization of laser cooling parameters and prediction of possible low limit of beam temperature at S-LSR. Firstly, the adiabatic capture process of ion beam is introduced and studied. Then, different laser profile parameters are compared and an optimized value is chosen. After that, optimized solenoid field strength for 3-D coupling is proposed. At last, by choosing the parameters proposed, the lowest beam temperature achievable for S-LSR is predicted to be 10K in horizontal direction and 0.05K in longitudinal direction.

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.

THPHO01

Parameter Optimization for Multi-Dimensional Laser Cooling for an Ion Beam in the Storage Ring S-LSR

1298

Z.Q. He
TUB, Beijing, People's Republic of China
K. Jimbo
Kyoto University, Kyoto, Japan
M. Nakao, A. Noda
NIRS, Chiba-shi, Japan
H. Okamoto, K. Osaki
HU/AdSM, Higashi-Hiroshima, Japan
H. Souda
Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan
J. Wei
FRIB, East Lansing, USA
Y. Yuri
JAEA/TARRI, Gunma-ken, Japan

Funding: Advanced Compact Accelerator Development project, MEXT, Japan. GCOE project, Kyoto University, Japan.
Abstract: S-LSR is a compact ion cooler ring built in ICR, Kyoto University, aiming at creating ultra-low temperature ion beam by laser cooling. In order to approach lowest possible temperature at S-LSR in an experiment, parameters of laser cooling should be carefully chosen by simulation. This paper mainly concerns on optimization of laser cooling parameters and prediction of possible low limit of beam temperature at S-LSR. Firstly, the adiabatic capture process of ion beam is introduced and studied. Then, different laser profile parameters are compared and an optimized value is chosen. After that, optimized solenoid field strength for 3-D coupling is proposed. At last, by choosing the parameters proposed, the lowest beam temperature achievable for S-LSR is predicted to be 10K in horizontal direction and 0.05K in longitudinal direction.