Review and demonstration of ultra-low-emittance photocathode measurements

Hyeri Lee, Siddharth Karkare, Luca Cultrera, Andrew Kim, Ivan V. Bazarov

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Abstract

This paper reports the development of a simple and reliable apparatus for measuring ultra-low emittance, or equivalently the mean transverse energy from cryogenically cooled photocathodes. The existing methods to measure ultra-low emittance from photocathodes are reviewed. Inspired by the available techniques, we have implemented two complementary methods, the waist scan and voltage scan, in one system giving consistent results. Additionally, this system is capable of measuring the emittance at electric fields comparable to those obtained in DC photoinjectors.

Original languageEnglish (US)
Article number073309
JournalReview of Scientific Instruments
Volume86
Issue number7
DOIs
StatePublished - Jul 1 2015
Externally publishedYes

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ASJC Scopus subject areas

  • Instrumentation

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