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Title: Ultrafast compact classical Mott polarimeter

Abstract

An ultrafast compact classical Mott detector is described. The efficiency of the polarimeter is {epsilon}{approx_equal}6x10{sup -4} and the maximum counting rate {approx}2000 kcps. The Mott polarimeter employs photomultipliers with scintillators as electron energy sensitive detectors with low dark noise. The photomultipliers and scintillators are placed in vacuum. With this choice of technology, it will be possible to build a classical Mott detector with a bulk size of cubic decimeter in the future.

Authors:
; ; ; ;  [1]
  1. St. Petersburg State Polytechnical University, 29 Polytechnicheskaya Street, 195251 St. Petersburg (Russian Federation)
Publication Date:
OSTI Identifier:
20953267
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 78; Journal Issue: 2; Other Information: DOI: 10.1063/1.2437112; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; COUNTING RATES; EFFICIENCY; ELECTRON DETECTION; ELECTRONS; NOISE; PHOSPHORS; PHOTOMULTIPLIERS; POLARIMETERS; SCINTILLATION COUNTERS

Citation Formats

Petrov, V. N., Grebenshikov, V. V., Andronov, A. N., Gabdullin, P. G., and Maslevtcov, A. V. Ultrafast compact classical Mott polarimeter. United States: N. p., 2007. Web. doi:10.1063/1.2437112.
Petrov, V. N., Grebenshikov, V. V., Andronov, A. N., Gabdullin, P. G., & Maslevtcov, A. V. Ultrafast compact classical Mott polarimeter. United States. doi:10.1063/1.2437112.
Petrov, V. N., Grebenshikov, V. V., Andronov, A. N., Gabdullin, P. G., and Maslevtcov, A. V. Thu . "Ultrafast compact classical Mott polarimeter". United States. doi:10.1063/1.2437112.
@article{osti_20953267,
title = {Ultrafast compact classical Mott polarimeter},
author = {Petrov, V. N. and Grebenshikov, V. V. and Andronov, A. N. and Gabdullin, P. G. and Maslevtcov, A. V.},
abstractNote = {An ultrafast compact classical Mott detector is described. The efficiency of the polarimeter is {epsilon}{approx_equal}6x10{sup -4} and the maximum counting rate {approx}2000 kcps. The Mott polarimeter employs photomultipliers with scintillators as electron energy sensitive detectors with low dark noise. The photomultipliers and scintillators are placed in vacuum. With this choice of technology, it will be possible to build a classical Mott detector with a bulk size of cubic decimeter in the future.},
doi = {10.1063/1.2437112},
journal = {Review of Scientific Instruments},
number = 2,
volume = 78,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}
  • No abstract prepared.
  • A simple low-voltage (20-kV) UHV-compatible Mott polarimeter is described that incorporates an in-line retarding potential energy analyzer that, at incident electron energies less than or equal to50 eV, provides an energy resolution of less than or equal to0.5 eV. The polarimeter is very compact and is suitable for use in a wide variety of applications requiring energy- and angle-resolved polarization measurements.
  • A compact retarding-potential Mott polarimeter combined with microsphere plates (MSP) as electron detectors was built to perform spin-resolved time-of-flight electron spectroscopy. The comparison of the performance of MSP and channeltron detectors shows that the MSP detector has a better time resolution but a lower efficiency. The overall time resolution of the system was determined to be 350 ps using synchrotron radiation pulses. (c) 2000 American Institute of Physics.
  • Low energy (E{sub k}=100thinspkeV) Mott scattering polarimeters are ill-suited to support operations foreseen for the polarized electron injector at Jefferson Lab. One solution is to measure the polarization at 5 MeV where multiple and plural scattering are unimportant and precision beam monitoring is straightforward. The higher injector beam current offsets the lower cross-sections. Recent improvements in the CEBAF injector polarimeter scattering chamber have improved signal to noise. {copyright} {ital 1998 American Institute of Physics.}
  • 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 30 kV. 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 20 keV, the effective Sherman function is 0.201(5). Its maximum efficiency at 20 keV, defined asmore » 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.« less