Bunch Shape Measurements at the GSI CW-Linac Prototype
Bunch Shape Measurements at the GSI CW-Linac Prototype
复制标题
GSI CW-Linac 原型上的束形状测量
DOI：
10.18429/jacow-ipac2018-wepak006
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
S. Yaramyshev
中科院分区：
文献类型：
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作者：
T. Sieber;W. Barth;F. Dziuba;A. Feschenko;P. Forck;S. Gavrilov;V. Gettmann;M. Heilmann;T. Kürzeder;M. Miski;H. Reeg;A. Reiter;S. Yaramyshev
现有的GSI加速器将成为FAIR的注入器[1-5]。为了保持和加强UNILAC目前的实验计划，一个新的直线加速器正在开发中，它将与FAIR注入器平行运行，提供能量为3.5 - 7.3 MeV/u的连续波离子束[6，7]。对于这种连续波直线加速器，已经开发了超导原型腔，并于2017年夏天首次使用束流运行[8]。谐振器是一个0.7米长的十字杆H型结构（CH），谐振频率为216.8 MHz。它被安装在GSI高电荷态注入器（HLI）后面，该注入器以25%的占空比提供1.4 MeV/u Ar 6 +/9+/11+离子的108 MHz束。由于CH的频率跳变和小的纵向接受度，需要HLI波束与原型适当匹配。利用在莫斯科INR制造的束团形状监测器（BSM）[9]详细测量了注入光束的束团特性以及腔体的不同相位和振幅设置的影响，同时通过相位探针的飞行时间方法分析了平均能量。在这方面的贡献，束团形状的测量和所使用的BSM测量原理的能力进行了讨论。
The existing GSI accelerator will become the injector for FAIR [1-5]. To preserve and enhance the current experimental program at UNILAC, a new Linac is under development, which shall run in parallel to the FAIR injector, providing cw-beams of ions at energies from 3.5 – 7.3 MeV/u [6, 7]. For this cw-Linac a superconducting prototype cavity has been developed and was first operated with beam in summer 2017 [8]. The resonator is a cross-bar H-structure (CH) of 0.7 m length, with a resonant frequency of 216.8 MHz. It has been installed behind the GSI High Charge State Injector (HLI), which provided 108 MHz bunches of 1.4 MeV/u Ar6+/9+/11+ ions at a duty cycle of 25%. Due to the frequency jump and small longitudinal acceptance of the CH, proper matching of the HLI beam to the prototype was required. The bunch properties of the injected beam as well as the effect of different phaseand amplitude-settings of the cavity were measured in detail with a bunch shape monitor (BSM) fabricated at INR, Moscow [9], while the mean energy was analyzed by time-of-flight method with phase probes. In this contribution, the bunch shape measurements are described and the capabilities of the used BSM measurement principle are discussed.