CONCEPTS FOR CAPACITIVELY RF-SHIELDED BELLOWS IN CRYOGENIC STRUCTURES.

ZHAO,Y. HAHN,H.

Brookhaven National Laboratory

关键词: Fingers;    43 Particle Accelerators;    Shields;    Accelerators;    Impedance;   

DOI  :  10.2172/15007382
RP-ID  :  BNL--72179-2004-IR
RP-ID  :  AC02-98CH10886
RP-ID  :  15007382

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来源: UNT Digital Library

【 摘 要 】

Bellows are frequently required in accelerators and colliders. Usually RF-shields with spring fingers are employed to screen the bellows. The lack of accessibility in cryogenic systems can be a problem and asks for alternate solutions to eliminate possible overheating, sparking, etc that occurred in intensive beams. This note addresses an alternate kind of RF shield, which uses capacitive contact instead of mechanical contact. The analysis, as well as numerical example of a superconducting cavity structure, shows that the capacitive RF shield satisfies the impedance requirements of both beam and HOMs. The capability of thermal isolation is also analyzed.