Approach to the low temperature state oriented for crystalline beam

野田 章*; 中尾 政夫*; 想田 光*; 頓宮 拓*; 神保 光一*; 岡本 宏巳*; 大崎 一哉*; 百合 庸介; Meshkov, I.*; Smirnov, A.*; et al.

Proceedings of 23rd Russian Particle Accelerator Conference (RuPAC 2012) (Internet), p.48 - 52, 2012/09

http://accelconf.web.cern.ch/AccelConf/rupac2012/papers/tuxch03.pdf

Various approaches to attaining low-temperature beams have been continued in the cooler storage ring S-LSR at Kyoto University. One-dimensional ordering of electron-cooled 7-MeV protons was realized with an abrupt longitudinal temperature jump from 2 K to 0.3 K at a particle number of around 2000. Laser cooling has been applied to 40-keV Mg beams toward the realization of crystalline beams. For a coasting beam, the lowest longitudinal temperature of 3.6 K was attained at ions. The temperature was limited due to intra-beam scattering (IBS). On the other hand, the transverse temperature of the beam indirectly cooled through IBS was saturated at 500 K for ions. In order to cool the transverse direction further, synchro-betatron resonance coupling has been applied to a bunched Mg beam. The transverse temperature has been reduced to the order of K at the beam intensity of ions by the reduction of the beam intensity using a scraper.