LCLS RF光电注入器的新设计研究及相关实验程序
New Design Study and Related Experimental Program for the LCLS RF Photoinjector
摘要：
我们报告的结果，最近的光束动力学研究，动机是需要重新设计的LCLS的光注入器，导致发现一个新的有效的工作点的分裂RF光注入器。我们考虑了空间电荷束的发射度补偿机制：通过增加螺线管强度，发射度在漂移区呈现双极小行为。如果助推器位于相对发射度最大值和包络腰部出现的地方，第二个发射度最小值可以被转移到助推器出口，并冻结在一个非常低的水平（0.3毫米mrad的1 nC平顶聚束），在一定程度上，不变的包络匹配条件得到满足。驻波结构或嵌入长螺线管的行波结构都是升压直线加速器的候选者。仔细测量的发射度的演变作为在漂移区的位置的函数是必要的，以验证计算和实验确定适当的位置的助推器腔。新的设计研究和支持的实验计划正在进行中的SLAC枪测试设备进行了讨论。
英文摘要：
We report the results of a recent beam dynamics study, motivated by the need to redesign the LCLS photoinjector, that lead to the discovery of a new effective working point for a split RF photoinjector. We consider the emittance compensation regime of a space charge beam: by increasing the solenoid strength, the emittance evolution shows a double minimum behavior in the drifting region. If the booster is located where the relative emittance maximum and the envelope waist occur, the second emittance minimum can be shifted to the booster exit and frozen at a very low level (0.3 mm-mrad for a 1 nC flat top bunch), to the extent that the invariant envelope matching conditions are satisfied. Standing Wave Structures or alternatively Traveling Wave Structures embedded in a Long Solenoid are both candidates as booster linac. A careful measurement of the emittance evolution as a function of position in the drifting region is necessary to verify the computation and to determine experimentally the proper position of the booster cavities. The new design study and supporting experimental program under way at the SLAC Gun Test Facility are discussed.
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