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Title: Cesium telluride cathodes for the next generation of high-average current high-brightness photoinjectors

We report on the performances of a Cs{sub 2}Te photocathode under extreme conditions of high peak time-dependent accelerating fields, continuous wave operations, and MHz pulse extraction with up to 0.3 mA average current. The measurements, performed in a normal conducting cavity, show extended lifetime and robustness, elucidate the main mechanisms for cathode degradation, and set the required system vacuum performance for compatibility with the operations of a high average power X-ray free electron laser user facility, opening the doors to the next generation of MHz-scale ultrafast scientific instruments.
Authors:
; ;  [1]
  1. Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720 (United States)
Publication Date:
OSTI Identifier:
22486380
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BRIGHTNESS; CESIUM; CESIUM TELLURIDES; CURRENTS; FREE ELECTRON LASERS; LIFETIME; MHZ RANGE; PEAKS; PERFORMANCE; PHOTOCATHODES; PULSES; TIME DEPENDENCE; X RADIATION