R&D ERL: HOM Absorbers

Hahn, H. ; Ben-Zvi, I. ; Calaga, R. ; Hammons, L. ; Litvinenko, V.N. ; Xu, W.

Brookhaven National Laboratory. Collider-Accelerator Department.

关键词: Copper;    Superconducting Cavity Resonators Relativistic Heavy Ion Collider;    Energy Recovery;    43 Particle Accelerators;    Heavy Ions;   

DOI  :  10.2172/1013446
RP-ID  :  BNL--90923-2010-IR
RP-ID  :  DE-AC02-98CH10886
RP-ID  :  1013446

美国|英语

来源: UNT Digital Library

【 摘 要 】

Several future accelerator projects at the Relativistic Heavy Ion Collider (RHIC) are based on Energy Recovery Linacs (ERL) with high-charge high-current electron beams. Their stable operation mandates effective higher-order-mode (HOM) damping. The development of HOM dampers for these projects is pursued actively at this laboratory. A strong HOM damping was experimentally demonstrated both at room- and at superconducting- (SC) temperatures in a prototype R&D five-cell niobium SRF cavity with ferrite dampers. A novel type of ferrite damper over a ceramic break for a R&D SRF electron gun also was developed. For future SRF linacs longer cryomodules comprising of multiple superconducting cavities with reasonably short transitions between them are planned. In such a configuration, the dampers, located closer to the cavities, will be at cryogenic temperatures; this will impose additional constraints and complications. Two room-temperature mock-up five-cell copper cavities were used to study various damper configurations. This paper presents results of simulations and measurements for several configurations.