A low-voltage retarding-field Mott polarimeter for photocathode characterization

J. L. McCarter; M. L. Stutzman; K. W. Trantham; T. G. Anderson; A. M. Cook; T. J. Gay

doi:10.1016/j.nima.2010.02.123

A low-voltage retarding-field Mott polarimeter for photocathode characterization

J. L. McCarter, M. L. Stutzman, K. W. Trantham, T. G. Anderson, A. M. Cook, T. J. Gay

Physics & Physical Science

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13 Scopus citations

Abstract

Nuclear physics experiments at Thomas Jefferson National Accelerator Facility's CEBAF rely on high polarization electron beams. We describe a recently commissioned system for prequalifying and studying photocathodes for CEBAF with a load-locked, low-voltage polarized electron source coupled to a compact retarding-field Mott polarimeter. The polarimeter uses simplified electrode structures and operates from 5 to 30kV. The effective Sherman function for this device has been calibrated by comparison with the CEBAF 5 MeV Mott polarimeter. For elastic scattering from a thick gold target at 20keV, the effective Sherman function is 0.201(5). Its maximum efficiency at 20keV, defined as the detected count rate divided by the incident particle current, is 5.4(2) × 10^-4, yielding a figure-of-merit, or analyzing power squared times efficiency, of 1.0(1) × 10^-5. The operating parameters of this new polarimeter design are compared to previously published data for other compact Mott polarimeters of the retarding-field type.

Original language	English (US)
Pages (from-to)	30-36
Number of pages	7
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	618
Issue number	1-3
DOIs	https://doi.org/10.1016/j.nima.2010.02.123
State	Published - Jun 1 2010

Keywords

Mott
Polarimeter
Polarization
Source

ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation

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10.1016/j.nima.2010.02.123

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McCarter, J. L., Stutzman, M. L., Trantham, K. W., Anderson, T. G., Cook, A. M., & Gay, T. J. (2010). A low-voltage retarding-field Mott polarimeter for photocathode characterization. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 618(1-3), 30-36. https://doi.org/10.1016/j.nima.2010.02.123

A low-voltage retarding-field Mott polarimeter for photocathode characterization. / McCarter, J. L.; Stutzman, M. L.; Trantham, K. W. et al.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 618, No. 1-3, 01.06.2010, p. 30-36.

Research output: Contribution to journal › Article › peer-review

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abstract = "Nuclear physics experiments at Thomas Jefferson National Accelerator Facility's CEBAF rely on high polarization electron beams. We describe a recently commissioned system for prequalifying and studying photocathodes for CEBAF with a load-locked, low-voltage polarized electron source coupled to a compact retarding-field Mott polarimeter. The polarimeter uses simplified electrode structures and operates from 5 to 30kV. The effective Sherman function for this device has been calibrated by comparison with the CEBAF 5 MeV Mott polarimeter. For elastic scattering from a thick gold target at 20keV, the effective Sherman function is 0.201(5). Its maximum efficiency at 20keV, defined as the detected count rate divided by the incident particle current, is 5.4(2) × 10-4, yielding a figure-of-merit, or analyzing power squared times efficiency, of 1.0(1) × 10-5. The operating parameters of this new polarimeter design are compared to previously published data for other compact Mott polarimeters of the retarding-field type.",

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AB - Nuclear physics experiments at Thomas Jefferson National Accelerator Facility's CEBAF rely on high polarization electron beams. We describe a recently commissioned system for prequalifying and studying photocathodes for CEBAF with a load-locked, low-voltage polarized electron source coupled to a compact retarding-field Mott polarimeter. The polarimeter uses simplified electrode structures and operates from 5 to 30kV. The effective Sherman function for this device has been calibrated by comparison with the CEBAF 5 MeV Mott polarimeter. For elastic scattering from a thick gold target at 20keV, the effective Sherman function is 0.201(5). Its maximum efficiency at 20keV, defined as the detected count rate divided by the incident particle current, is 5.4(2) × 10-4, yielding a figure-of-merit, or analyzing power squared times efficiency, of 1.0(1) × 10-5. The operating parameters of this new polarimeter design are compared to previously published data for other compact Mott polarimeters of the retarding-field type.

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A low-voltage retarding-field Mott polarimeter for photocathode characterization

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