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Title: Vacuum Characterization and Improvement for the Jefferson Lab Polarized Electron Source

Operating the JLab polarized electron source with high reliability and long lifetime requires vacuum near the XHV level, defined as pressure below 7.5×10-13 Torr. This paper describes ongoing vacuum research at Jefferson Lab including characterization of outgassing rates for surface coatings and heat treatments, ultimate pressure measurements, investigation of pumping including an XHV cryopump, and characterization of ionization gauges in this pressure regime.
Authors:
 [1] ;  [1] ;  [1] ;  [2]
  1. Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
  2. Old Dominion Univ., Norfolk, VA (United States)
Publication Date:
OSTI Identifier:
1223477
Report Number(s):
JLAB-ACC--15-2024; DOE/OR/23177--3538
TRN: US1601443
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: IPAC 2015, Richmond, VA (United States), 3-8 May 2015
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; CEBAF ACCELERATOR; ELECTRON SOURCES; HEAT TREATMENTS; PRESSURE MEASUREMENT; DEGASSING; PUMPING; POLARIZED BEAMS; CRYOPUMPS; IONIZATION GAGES; COATINGS; PRESSURE RANGE BELOW 1 NANO PA