RF Simulation of the 187 MHz CW Photo-RF Gun Cavity at LBNL

Huang, Tong-Ming¹ 

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

关键词: MHZ RANGE 100-1000;    CAVITY RESONATORS;    COMPUTERIZED SIMULATION;    ELECTRON GUNS;    LIGHT SOURCES;    POWER DENSITY;    CONFIGURATION;    VACUUM PUMPS;    ELECTRIC POTENTIAL;    THERMAL ANALYSIS;    ATTENUATION;    DESIGN;    OPTIMIZATION;    RADIOWAVE RADIATION;    PRESSURE RANGE NANO PA;    THREE-DIMENSIONAL CALCULATIONS;    LINEAR ACCELERATORS;   

DOI  :  10.2172/1235575
RP-ID  :  LBNL--1003794
PID  :  OSTI ID: 1235575
Others  :  Other: ir:1003794
Others  :  TRN: US1600254

学科分类：核物理和高能物理

美国|英语

来源: SciTech Connect

【 摘 要 】

A 187 MHz normal conducting Photo-RF gun cavity is designed for the next generation light sources. The cavity is capable of operating in CW mode. As high as 750 kV gap voltage can be achieved with a 20 MV/m acceleration gradient. The original cavity optimization is conducted using Superfish code (2D) by Staples. 104 vacuum pumping slots are added and evenly spaced over the cavity equator in order to achieve better than 10^-10-Tor of vacuum. Two loop couplers will be used to feed RF power into the cavity. 3D simulations are necessary to study effects from the vacuum pumping slots, couplers and possible multipactoring. The cavity geometry is optimized to minimize the power density and avoid multipactoring at operating field level. The vacuum slot dimensions are carefully chosen in consideration of both the vacuum conduction, local power density enhancement and the power attenuation at the getter pumps. This technical note gives a summary of 3D RF simulation results, multipactoring simulations (2D) and preliminary electromagnetic-thermal analysis using ANSYS code.