Abstract
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 language | English (US) |
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Pages (from-to) | 293-317 |
Number of pages | 25 |
Journal | Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |
Volume | 278 |
Issue number | 2 |
DOIs | |
State | Published - Jun 1 1989 |
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ASJC Scopus subject areas
- Instrumentation
- Nuclear and High Energy Physics
- Engineering(all)
Cite this
The bates polarized electron source. / Cates, G. D.; Hughes, V. W.; Michaels, R.; Schaefer, H. R.; Gay, T. J.; Lubell, M. S.; Wilson, R.; Dodson, G. W.; Dow, K. A.; Kowalski, S. B.; Isakovich, K.; Kumar, K. S.; Schulze, M. E.; Souder, Paul A; Kim, D. H.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 278, No. 2, 01.06.1989, p. 293-317.Research output: Contribution to journal › Article
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TY - JOUR
T1 - The bates polarized electron source
AU - Cates, G. D.
AU - Hughes, V. W.
AU - Michaels, R.
AU - Schaefer, H. R.
AU - Gay, T. J.
AU - Lubell, M. S.
AU - Wilson, R.
AU - Dodson, G. W.
AU - Dow, K. A.
AU - Kowalski, S. B.
AU - Isakovich, K.
AU - Kumar, K. S.
AU - Schulze, M. E.
AU - Souder, Paul A
AU - Kim, D. H.
PY - 1989/6/1
Y1 - 1989/6/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0024685429&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0024685429&partnerID=8YFLogxK
U2 - 10.1016/0168-9002(89)90846-2
DO - 10.1016/0168-9002(89)90846-2
M3 - Article
AN - SCOPUS:0024685429
VL - 278
SP - 293
EP - 317
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
SN - 0168-9002
IS - 2
ER -