Pump Port Calculations for the VHF Photoinjector Cavity

Staples, John¹  Huang, Gang¹  Wells, Russell¹ 

[1] Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

关键词: VACUUM PUMPS;    MHZ RANGE;    CAVITY RESONATORS;    PHOTOCATHODES;    COMPARATIVE EVALUATIONS;    WALLS;    POWER DENSITY;    LINEAR ACCELERATORS;    DESIGN;    ELECTROMAGNETIC FIELDS;    SPATIAL DISTRIBUTION;   

DOI  :  10.2172/1235576
RP-ID  :  LBNL--1003795
PID  :  OSTI ID: 1235576
Others  :  Other: ir:1003795
Others  :  TRN: US1600255

学科分类：核物理和高能物理

美国|英语

来源: SciTech Connect

【 摘 要 】

The VHF photoinjector cavity requires a vacuum in the 10^-9 to 10^-11 Torr range, depending on the type of photocathode selected. One possible arrangement of the vacuum pumps replaces the outer cavity wall with a series of slots, and outside the slots, getter pumps are located in the region shielded from the RF fields. Calculations were carried out to determine the frequency shift due to the slots, compared to a solid outer wall, the power density on the bars, and the field drop-off to the outer plenum.