COOL2013 - List of Authors (Osaki, K.)

Paper

Title

Page

Latest Results of Experimental Approach to Ultra-cold Beam at S-LSR

157

A. Noda, M. Nakao, H. Souda, H. Tongu
Kyoto ICR, Uji, Kyoto, Japan
M. Grieser
MPI-K, Heidelberg, Germany
Z.Q. He
TUB, Beijing, People's Republic of China
K. Jimbo
Kyoto University, Institute for Advanced Energy, Kyoto, Japan
H. Okamoto, K. Osaki
HU/AdSM, Higashi-Hiroshima, Japan
Y. Yuri
JAEA/TARRI, Gunma-ken, Japan

Funding: This work was supported by Advanced Compact Accelerator Development project by MEXT. It is also supported by GCOE program at Department of Physics and Collaborative program of ICR, Kyoto University
Utilizing S-LSR which has a super-periodicity of 6 and is designed to be tough against resonant perturbation to the circulating beam, we have tried to realize as low as possible temperatures with a laser cooled 40keV 24Mg+ ion beam. With the proposed theoretical Synchro-Betatron Resonance Coupling scheme*, we have experimentally demonstrated the capability of active indirect transverse laser cooling*, which is limited by heating due to intra-beam scattering (IBS). In order to redece the heating by IBS, we have established a scheme to control the circulating ion beam intensity down to ~10⁴ by scraping the outskirt of the beam with a horizontally moving scraper, which enabled us to cool down the transverse beam temperature down to ~ 20 K and ~30 K for the horizontal and vertical directions, respectively for the operation tune without H-V coupling***. In the present paper I would like to present our recent results with H-V coupling in addition to longitudinal and horizontal coupling aiming at a further reduction of the beam transverse temperature.
* H. Okamoto, A.M. Sessler and D. Möhl, Phys. Rev. Lett. 72, 3977(1994).
** M. Nakao et al., Phys. Rev. ST-AB, 15 (2012) 110102.
*** H. Souda et al., Jpan. J. Appl. Phys. in print.

Slides THAM1HA02 [6.120 MB]

THAM1HA03

Simulation Study on Transverse Laser Cooling and Crystallization of Heavy-Ion Beams at the Cooler Storage Ring S-LSR

162

Y. Yuri
JAEA/TARRI, Gunma-ken, Japan
Z.Q. He
Tsinghua University, Beijing, People's Republic of China
K. Jimbo
Kyoto University, Institute for Advanced Energy, Kyoto, Japan
M. Nakao, A. Noda, H. Souda, H. Tongu
Kyoto ICR, Uji, Kyoto, Japan
H. Okamoto, K. Osaki
HU/AdSM, Higashi-Hiroshima, Japan

Recently, efficient transverse laser cooling of a low-intensity heavy-ion beam has been accomplished experimentally by means of the resonant coupling method at the cooler storage ring S-LSR in Kyoto University [1]. In parallel with the experimental effort, multi-dimensional laser cooling of the ion beam has been studied also numerically using the molecular dynamics (MD) simulation code that incorporates the stochastic interaction between ions and laser photons in order to search optimum laser-cooling conditions and verify the observation result in the experiment. In this presentation, the latest MD simulation result is reported on the characteristics of 40 keV ²⁴Mg⁺ ion beams laser-cooled in S-LSR. It is shown that, in spite of the limited experimental conditions of the cooling laser such as low power, fixed frequency, and short cooling section, the three-dimensionally low-temperature ion beam is obtained.
[1] H. Souda, et al., Jpn. J. Appl. Phys., in press

Slides THAM1HA03 [5.578 MB]

Paper	Title	Page
THAM1HA02	Latest Results of Experimental Approach to Ultra-cold Beam at S-LSR	157
	A. Noda, M. Nakao, H. Souda, H. Tongu Kyoto ICR, Uji, Kyoto, Japan M. Grieser MPI-K, Heidelberg, Germany Z.Q. He TUB, Beijing, People's Republic of China K. Jimbo Kyoto University, Institute for Advanced Energy, Kyoto, Japan H. Okamoto, K. Osaki HU/AdSM, Higashi-Hiroshima, Japan Y. Yuri JAEA/TARRI, Gunma-ken, Japan
	Funding: This work was supported by Advanced Compact Accelerator Development project by MEXT. It is also supported by GCOE program at Department of Physics and Collaborative program of ICR, Kyoto University Utilizing S-LSR which has a super-periodicity of 6 and is designed to be tough against resonant perturbation to the circulating beam, we have tried to realize as low as possible temperatures with a laser cooled 40keV 24Mg+ ion beam. With the proposed theoretical Synchro-Betatron Resonance Coupling scheme, we have experimentally demonstrated the capability of active indirect transverse laser cooling, which is limited by heating due to intra-beam scattering (IBS). In order to redece the heating by IBS, we have established a scheme to control the circulating ion beam intensity down to ~10⁴ by scraping the outskirt of the beam with a horizontally moving scraper, which enabled us to cool down the transverse beam temperature down to ~ 20 K and ~30 K for the horizontal and vertical directions, respectively for the operation tune without H-V coupling**. In the present paper I would like to present our recent results with H-V coupling in addition to longitudinal and horizontal coupling aiming at a further reduction of the beam transverse temperature. H. Okamoto, A.M. Sessler and D. Möhl, Phys. Rev. Lett. 72, 3977(1994). M. Nakao et al., Phys. Rev. ST-AB, 15 (2012) 110102. * H. Souda et al., Jpan. J. Appl. Phys. in print.
	Slides THAM1HA02 [6.120 MB]

THAM1HA03	Simulation Study on Transverse Laser Cooling and Crystallization of Heavy-Ion Beams at the Cooler Storage Ring S-LSR	162
	Y. Yuri JAEA/TARRI, Gunma-ken, Japan Z.Q. He Tsinghua University, Beijing, People's Republic of China K. Jimbo Kyoto University, Institute for Advanced Energy, Kyoto, Japan M. Nakao, A. Noda, H. Souda, H. Tongu Kyoto ICR, Uji, Kyoto, Japan H. Okamoto, K. Osaki HU/AdSM, Higashi-Hiroshima, Japan
	Recently, efficient transverse laser cooling of a low-intensity heavy-ion beam has been accomplished experimentally by means of the resonant coupling method at the cooler storage ring S-LSR in Kyoto University [1]. In parallel with the experimental effort, multi-dimensional laser cooling of the ion beam has been studied also numerically using the molecular dynamics (MD) simulation code that incorporates the stochastic interaction between ions and laser photons in order to search optimum laser-cooling conditions and verify the observation result in the experiment. In this presentation, the latest MD simulation result is reported on the characteristics of 40 keV ²⁴Mg⁺ ion beams laser-cooled in S-LSR. It is shown that, in spite of the limited experimental conditions of the cooling laser such as low power, fixed frequency, and short cooling section, the three-dimensionally low-temperature ion beam is obtained. [1] H. Souda, et al., Jpn. J. Appl. Phys., in press
	Slides THAM1HA03 [5.578 MB]