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Title: Correlation of CsK2Sb photocathode lifetime with antimony thickness

CsK2Sb photocathodes with quantum efficiency on the order of 10% at 532 nm, and lifetime greater than 90 days at low voltage, were successfully manufactured via co-deposition of alkali species emanating from an effusion source. Photocathodes were characterized as a function of antimony layer thickness and alkali consumption, inside a vacuum chamber that was initially baked, but frequently vented without re-baking. Photocathode lifetime measured at low voltage is correlated with the antimony layer thickness. Photocathodes manufactured with comparatively thick antimony layers exhibited the best lifetime. We speculate that the antimony layer serves as a reservoir, or sponge, for the alkali.
Authors:
 [1] ;  [2] ;  [2] ;  [1]
  1. Department of Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, Virginia 23529, USA; The Applied Research Center, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
  2. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
Publication Date:
OSTI Identifier:
1223490
Report Number(s):
JLAB-ACC-15-1947; DOE/OR/23177-3582
Journal ID: ISSN 2166-532X: AMPADS
DOE Contract Number:
DMR-0420304; FG02-97ER45625
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL Materials; Journal Volume: 3; Journal Issue: 6
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English