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

Technical Report · Mon Dec 01 00:00:00 EST 2008

DOI:https://doi.org/10.2172/1235575· OSTI ID:1235575

Huang, Tong-Ming ^[1]

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

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.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Fusion Energy Sciences (FES)
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 1235575
• Report Number(s): LBNL-1003794; ir:1003794; TRN: US1600254
• Resource Relation: Related Information: CBP Tech. Note 393
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
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