Design and construction of a high-energy photon polarimeter

Michael Dugger, Barry Ritchie, N. Sparks, K. Moriya, R. J. Tucker, R. J. Lee, B. N. Thorpe, T. Hodges, F. J. Barbosa, N. Sandoval, R. T. Jones

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

We report on the design and construction of a high-energy photon polarimeter for measuring the degree of polarization of a linearly-polarized photon beam. The photon polarimeter uses the process of pair production on an atomic electron (triplet production). The azimuthal distribution of scattered atomic electrons following triplet production yields information regarding the degree of linear polarization of the incident photon beam. The polarimeter, operated in conjunction with a pair spectrometer, uses a silicon strip detector to measure the recoil electron distribution resulting from triplet photoproduction in a beryllium target foil. The analyzing power ΣA for the device using a 75 μm beryllium converter foil is about 0.2, with a relative systematic uncertainty in ΣA of 1.5%.

Original languageEnglish (US)
Pages (from-to)115-127
Number of pages13
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume867
DOIs
StatePublished - Sep 21 2017

Keywords

  • Beam characteristics
  • Polarization measurement
  • Polarized photon beam
  • Triplet photoproduction

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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