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为了引出更高强度、更高亮度的铀离子束,以满足重离子研究中心(Gesellschaft fur Schwerionenforschung mbH,GSI)重离子同步加速器的需求,本文用三维的计算机程序KOBRA3-INP对金属真空弧离子源(Metal vapor vacuum arc ion source,MEVVA)引出强流铀离子束在引出系统和后加速系统中的动力学特性进行了研究,讨论了离子源发射束流密度对引出束性能的影响。结果表明,束流损失主要发生在引出系统和后加速系统之间的漂移区;在假设漂移区束流被空间电荷中和的情况下,模拟结果和实验结果符合;在发射束流密度为180-230 mA／cm2范围内,经后加速的束流强度变化不大。
In order to meet the demand of the heavy ion synchrotron by the Gesellschaft fur Schwerionenforschung mbH (GSI) in order to extract uranium ion beam with higher intensity and higher brightness, a three-dimensional computer program KOBRA3-INP (MEVVA) was used to study the dynamic characteristics of the strong uranium ion beam in the extraction system and the post-acceleration system. The effects of ion beam emission beam density on the performance of the extraction beam were discussed. The results show that the beam loss mainly occurs in the drift region between the outgoing system and the post-acceleration system. The simulation results are consistent with the experimental results under the assumption that the beam in the drift region is neutralized by space charge. When the beam current density is 180 In the range of -230 mA / cm2, the post-accelerated beam intensity did not change much.