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非全裸离子在储存环内冷却储存时主要通过碰撞离化和辐射电子俘获进行损失。兰州重离子加速器(HIRFL)实验环(CSRe)调束发现,能量为122 MeV/u的~(12)C~(3+)离子束注入到CSRe后的存储寿命仅为6.6s,且电子冷却效果不明显。本文结合CSRe真空条件计算了~(12)C~(3+)离子束的存储寿命及其电子冷却时间,确定了CSRe平均真空度为10-8 Pa量级是导致非全裸的~(12)C~(3+)离子束存储寿命减小的主要原因,而电子冷却作用及辐射电子俘获引起的~(12)C~(3+)离子束损失被~(12)C~(3+)离子束与残余气体碰撞离化损失所掩盖,即~(12)C~(3+)离子束在未被完全冷却前便由于存储寿命过短而近乎全部损失。这解释了CSRe初步电子冷却调试中~(12)C~(3+)离子束快速损失的主要原因。
Partially non-fully charged ions are mainly lost through collision ionization and electron capture by radiation when they are stored in a storage ring for cooling. The HIRFL experimental ring (CSR) beam modulation showed that the lifetime of 12 C ~ (3+) ion beam with energy of 122 MeV / u was only 6.6s after CSRe injection, and the electronic cooling no significant effect. In this paper, the storage life and electronic cooling time of ~ (12) C ~ (3 +) ion beam were calculated based on the CSRe vacuum conditions. It was found that the average CSRe degree of vacuum was 10-8 Pa, However, the loss of ~ (12) C ~ (3 +) ion beam caused by the electron cooling and electron capture by the electrons is reduced by ~ (12) C ~ (3+) Ion beam and residual gas collision ionization loss to cover up, that is, ~ (12) C ~ (3+) ion beam before it is completely cooled due to storage life is too short and almost all losses. This explains the main reason for the rapid loss of ~ (12) C ~ (3+) ion beam during CSRC preliminary electronic cooling debugging.