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Title: Cathode R&D for Future Light Sources

This paper reviews the requirements and current status of cathodes for accelerator applications, and proposes a research and development plan for advancing cathode technology. Accelerator cathodes need to have long operational lifetimes and produce electron beams with a very low emittance. The two principal emission processes to be considered are thermionic and photoemission with the photocathodes being further subdivided into metal and semi-conductors. Field emission cathodes are not included in this analysis. The thermal emittance is derived and the formulas used to compare the various cathode materials. To date, there is no cathode which provides all the requirements needed for the proposed future light sources. Therefore a three part research plan is described to develop cathodes for these future light source applications.
Authors:
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Publication Date:
OSTI Identifier:
979945
Report Number(s):
SLAC-PUB-14002
Journal ID: ISSN 0168-9002; TRN: US1003414
DOE Contract Number:
AC02-76SF00515
Resource Type:
Journal Article
Resource Relation:
Journal Name: Submitted to Nuclear Instrumentation and Methods (NIM) A
Research Org:
SLAC National Accelerator Laboratory (SLAC)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; CATHODES; ELECTRON BEAMS; FIELD EMISSION; LIGHT SOURCES; PHOTOCATHODES; PHOTOEMISSION; THERMIONICS Accelerators,