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Title: Gamma ray imager on the DIII-D tokamak

Abstract

A gamma ray camera is built for the DIII-D tokamak [J. Luxon, Nucl. Fusion 42, 614 (2002)] that provides spatial localization and energy resolution of gamma flux by combining a lead pinhole camera with custom-built detectors and optimized viewing geometry. This diagnostic system is installed on the outer midplane of the tokamak such that its 123 collimated sightlines extend across the tokamak radius while also covering most of the vertical extent of the plasma volume. A set of 30 bismuth germanate detectors can be secured in any of the available sightlines, allowing for customizable coverage in experiments with runaway electrons in the energy range of 1- 60 MeV. Commissioning of the gamma ray imager includes the quantification of electromagnetic noise sources in the tokamak machine hall and a measurement of the energy spectrum of background gamma radiation. In conclusion, first measurements of gamma rays coming from the plasma provide a suitable testbed for implementing pulse height analysis that provides the energy of detected gamma photons.

Authors:
ORCiD logo [1];  [2];  [1];  [1];  [3];  [4];  [1];  [1]
  1. General Atomics, San Diego, CA (United States)
  2. Oak Ridge Associated Univ., Oak Ridge, TN (United States)
  3. Univ. of California, San Diego, CA (United States)
  4. State Univ. of New York (SUNY), Buffalo, NY (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS)
OSTI Identifier:
1371566
Alternate Identifier(s):
OSTI ID: 1247218
Grant/Contract Number:  
FC02-04ER54698; AC05-06OR23100; FG02-07ER54912
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 4; Related Information: D.C. Pace, C.M. Cooper, D. Taussig, N.W. Eidietis, E.M. Hollmann, V. Riso, M.A. Van Zeeland, M. Watkins, "Gamma Ray Imager on the DIII-D Tokamak", Rev. Sci. Instr. 87, 043507 (2016); Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Pace, D. C., Cooper, C. M., Taussig, D., Eidietis, N. W., Hollmann, E. M., Riso, V., Van Zeeland, M. A., and Watkins, M.. Gamma ray imager on the DIII-D tokamak. United States: N. p., 2016. Web. https://doi.org/10.1063/1.4945566.
Pace, D. C., Cooper, C. M., Taussig, D., Eidietis, N. W., Hollmann, E. M., Riso, V., Van Zeeland, M. A., & Watkins, M.. Gamma ray imager on the DIII-D tokamak. United States. https://doi.org/10.1063/1.4945566
Pace, D. C., Cooper, C. M., Taussig, D., Eidietis, N. W., Hollmann, E. M., Riso, V., Van Zeeland, M. A., and Watkins, M.. Wed . "Gamma ray imager on the DIII-D tokamak". United States. https://doi.org/10.1063/1.4945566. https://www.osti.gov/servlets/purl/1371566.
@article{osti_1371566,
title = {Gamma ray imager on the DIII-D tokamak},
author = {Pace, D. C. and Cooper, C. M. and Taussig, D. and Eidietis, N. W. and Hollmann, E. M. and Riso, V. and Van Zeeland, M. A. and Watkins, M.},
abstractNote = {A gamma ray camera is built for the DIII-D tokamak [J. Luxon, Nucl. Fusion 42, 614 (2002)] that provides spatial localization and energy resolution of gamma flux by combining a lead pinhole camera with custom-built detectors and optimized viewing geometry. This diagnostic system is installed on the outer midplane of the tokamak such that its 123 collimated sightlines extend across the tokamak radius while also covering most of the vertical extent of the plasma volume. A set of 30 bismuth germanate detectors can be secured in any of the available sightlines, allowing for customizable coverage in experiments with runaway electrons in the energy range of 1- 60 MeV. Commissioning of the gamma ray imager includes the quantification of electromagnetic noise sources in the tokamak machine hall and a measurement of the energy spectrum of background gamma radiation. In conclusion, first measurements of gamma rays coming from the plasma provide a suitable testbed for implementing pulse height analysis that provides the energy of detected gamma photons.},
doi = {10.1063/1.4945566},
journal = {Review of Scientific Instruments},
number = 4,
volume = 87,
place = {United States},
year = {2016},
month = {4}
}

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Works referenced in this record:

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    Works referencing / citing this record:

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    • Paz-Soldan, C.; Cooper, C. M.; Aleynikov, P.
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    JET diagnostic enhancements testing and commissioning in preparation for DT scientific campaigns
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    Development of a new compact gamma-ray spectrometer optimised for runaway electron measurements
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    Development of gamma ray spectrometer with high energy and time resolutions on EAST tokamak
    journal, December 2019

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    Low-frequency whistler waves in quiescent runaway electron plasmas
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