Due to high ramping rates on the Booster Ring (BRing), which is the key part of the high-intensity heavy-ion accelerator facility (HIAF) complex at the Institute of Modern Physics (IMP), thin-wall vacuum chambers are required for all magnets to maintain the eddy currents at a tolerable level. A novel thin-wall vacuum chamber supported by ceramic rings was discussed and evaluated for the HIAF at the IMP to reduce the manufacturing cost, reduce the difficulty, shorten the production cycle, and improve the quality. Because the beam coupling impedance aspects are highly important for beam stability, several approaches were used to evaluate the impedance on the ceramics-loaded tube. In this article, we describe the results from the single- and two-wire bench measurements and the numerical simulations. The simulated and measured impedance results are consistent with each other. Several effective methods to mitigate the impedance were proposed and investigated in detail. According to the simulation and measurement results of the beam coupling impedance mitigation, this novel ceramic-ring copper-coated thin-wall vacuum chamber structure will be considered for application to the HIAF project with the highest priority.

中文翻译：

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评估 HIAF BRing 陶瓷环加载薄壁真空室光束阻抗的纵向和横向测量

由于作为现代物理研究所 (IMP) 高强度重离子加速器设施 (HIAF) 综合体的关键部分的助推器环 (BRing) 的高斜坡率，需要薄壁真空室所有磁铁以将涡流保持在可接受的水平。为降低制造成本、降低难度、缩短生产周期、提高质量，对一种新型陶瓷环支撑的薄壁真空室进行了讨论和评估，以用于 IMP 的 HIAF。由于梁耦合阻抗方面对梁稳定性非常重要，因此使用了几种方法来评估陶瓷加载管的阻抗。在本文中，我们描述了单线和两线台架测量以及数值模拟的结果。模拟和测量的阻抗结果相互一致。提出并详细研究了几种减轻阻抗的有效方法。根据束耦合阻抗抑制的模拟和测量结果，这种新型陶瓷环镀铜薄壁真空室结构将被优先考虑应用于 HIAF 项目。