HIE-ISOLDE高β四分之一波长谐振器的调谐系统
The Tuning System for the HIE-ISOLDE High-Beta Quarter Wave Resonator
摘要：
一个使用超导四分之一波谐振器（QWR）的新型直线加速器正在欧洲核子研究中心（CERN）的HIE-ISOLDE项目框架内建造。QWR由溅射在块状铜衬底上的铌制成。在4.5K下的工作频率为101.28MHz，它们将在束轴上提供6 MV/m的加速梯度，在腔壁上的总最大功率耗散为10 W。需要一个调谐系统，以便最大限度地减少光束操作中的正向功率变化，并补偿冷却过程中频率偏移中不可避免的不确定性。调谐系统必须满足RF、结构和热要求的复杂组合。本文介绍了功能规格，并详细介绍了调谐系统的RF和机械设计和仿真。在原型系统上进行的测试的结果进行了讨论，并在最终生产的工业化战略。
英文摘要：
A new linac using superconducting quarter-wave resonators (QWR) is under construction at CERN in the framework of the HIE-ISOLDE project. The QWRs are made of niobium sputtered on a bulk copper substrate. The working frequency at 4.5 K is 101.28 MHz and they will provide 6 MV/m accelerating gradient on the beam axis with a total maximum power dissipation of 10 W on cavity walls. A tuning system is required in order to both minimize the forward power variation in beam operation and to compensate the unavoidable uncertainties in the frequency shift during the cool-down process. The tuning system has to fulfil a complex combination of RF, structural and thermal requirements. The paper presents the functional specifications and details the tuning system RF and mechanical design and simulations. The results of the tests performed on a prototype system are discussed and the industrialization strategy is presented in view of final production.
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