The bates polarized electron source

G. D. Cates, V. W. Hughes, R. Michaels, H. R. Schaefer, T. J. Gay, M. S. Lubell, R. Wilson, G. W. Dodson, K. A. Dow, S. B. Kowalski, K. Isakovich, K. S. Kumar, M. E. Schulze, P. A. Souder, D. H. Kim

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


A polarized electron source, based on photoemission from GaAs, has been developed and installed at the MIT Bates Linear Accelerator Center. A multichamber vacuum system houses up to four GaAs crystals simultaneously, and is contained in a Faraday cage to provide about 300 keV in electrostatic acceleration. A modulated cw krypton ion laser is used to achieve stable operation during 15 μs pulses with a repetition rate of 600 Hz. The source has produced pre-injected peak currents in excess of 17 mA, and accelerated peak currents of 8 mA. The source has a calculated transverse phase space of 10-3 πmec - cm. Developed for initial us in a parity violation measurement in elastic polarized e-12C scattering, the first beam polarization measurement was 0.36 ± 0.04, as determined by Møller scattering at 250 MeV. Subsequent beam polarization measurements have yielded polarizations as high as 0.40 ± 0.03.

Original languageEnglish (US)
Pages (from-to)293-317
Number of pages25
JournalNuclear Inst. and Methods in Physics Research, A
Issue number2
StatePublished - Jun 1 1989

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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