VHF Injector Pumping Slot RF Shielding Effectiveness

Staples, John¹ 

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

关键词: RADIOWAVE RADIATION;    MHZ RANGE;    DEPTH;    PERFORMANCE;    SHIELDING;    COMPARATIVE EVALUATIONS;    ATTENUATION;    CAVITY RESONATORS;    SPUTTER-ION PUMPS;    CONFIGURATION;    LINEAR ACCELERATORS;    ELECTRON SOURCES;    ELECTRON GUNS;   

DOI  :  10.2172/1235577
RP-ID  :  LBNL--1003796
PID  :  OSTI ID: 1235577
Others  :  Other: ir:1003796
Others  :  TRN: US1600256

学科分类：核物理和高能物理

美国|英语

来源: SciTech Connect

【 摘 要 】

The effectiveness of the shielding of the pumping slots is calculated for two radial depths of the slots with Mafia-2 and compared to a simple recipe that calculates the RF attenuation in a slot. CBP Technical Note 378 describes the pumping configuration of the 100 MHz VHF photoinjector. The cavity is surrounded by 36 slots, 4.9 cm wide, separated by bars, also 4.9 cm wide. The radial depth of the bars controls the attenuation of the RF from the cavity proper to the annular plenum outside the bars where the getter pumps are located. This note describes calculations of the level of RF fields in the plenum for two different values of the radial depth of the bars and two different values of the spacing between the outer dimension of the bars and the outer plenum wall.