Pump Port Calculations for the VHF Photoinjector Cavity

Technical Report · Fri Jul 27 00:00:00 EDT 2007

DOI:https://doi.org/10.2172/1235576· OSTI ID:1235576

Staples, John ^[1]; Huang, Gang ^[1]; Wells, Russell ^[1]

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

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.

• 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: 1235576
• Report Number(s): LBNL-1003795; ir:1003795; TRN: US1600255
• Resource Relation: Related Information: CBP Tech. Note 378
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
VACUUM PUMPS
MHZ RANGE
CAVITY RESONATORS
PHOTOCATHODES
COMPARATIVE EVALUATIONS
WALLS
POWER DENSITY
LINEAR ACCELERATORS
DESIGN
ELECTROMAGNETIC FIELDS
SPATIAL DISTRIBUTION