LCLS II HE项目的SRF修整腔体/调谐器系统的加速寿命试验
Accelerated Lifetime Test of The SRF Dressed Cavity/Tuner System for LCLS II HE Project
摘要：
离频失谐方法正在考虑应用于LCLS-II-HE超导直线加速器中，以产生用于同时支持多个波荡器线的多能量电子束[1]。调谐器的设计已经改变，以提供大约3倍的频率调谐范围。离频操作（OFO）的工作要求规定腔室每月至少调谐两次。该规范要求调谐器的寿命比LCLS-II要求增加20倍。在FNAL的HTS上对带有调谐器的LCLS-II HE装饰腔进行了加速寿命测试。将详细分析调谐器的压电和步进电机致动器的磨损和性能的影响。此外，还将提供冷却至2 K并压缩2.6 mm约2000次循环时，经修整的腔波纹管的寿命测试结果。
英文摘要：
The off-frequency detune method is being considered for application in the LCLS-II-HE superconducting linac to produce multi-energy electron beams for supporting multiple undulator lines simultaneously [1]. Design of the tuner has been changed to deliver roughly 3 times larger frequency tuning range. Working requirements for off-frequency operation (OFO) state that cavities be tuned at least twice a month. This specification requires the in-crease of the tuner longevity by 20 times compared with LCLS-II demands. Accelerated longevity tests of the LCLS-II HE dressed cavity with tuner were conducted at FNAL's HTS. Detail analysis of wearing and impacts on performances of the tuner's piezo and stepper motor actuators will be presented. Additionally, results of longevity testing of the dressed cavity bellow, when cooled down to 2 K and compressed by 2.6 mm for roughly 2000 cycles, will be presented.
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