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Title: Imaging crystal spectrometer for high-resolution x-ray measurements on electron beam ion traps and tokamaks

Here, we describe a crystal spectrometer implemented on the Livermore electron beam ion traps that employ two spherically bent quartz crystals and a cryogenically cooled back-illuminated charge-coupled device detector to measure x rays with a nominal resolving power of λ/Δλ ≥ 10 000. Its focusing properties allow us to record x rays either with the plane of dispersion perpendicular or parallel to the electron beam and, thus, to preferentially select one of the two linear x-ray polarization components. Moreover, by choice of dispersion plane and focussing conditions, we use the instrument either to image the distribution of the ions within the 2 cm long trap region, or to concentrate x rays of a given energy to a point on the detector, which optimizes the signal-to-noise ratio. We demonstrate the operation and utility of the new instrument by presenting spectra of Mo 34+, which prepares the instrument for use as a core impurity diagnostic on the NSTX-U spherical torus and other magnetic fusion devices that employ molybdenum as plasma facing components.
Authors:
ORCiD logo [1] ;  [1] ; ORCiD logo [2] ;  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. Erlangen-Nurnberg, Bamberg (Germany)
Publication Date:
Report Number(s):
LLNL-JRNL-693322
Journal ID: ISSN 0034-6748; RSINAK
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 70 PLASMA PHYSICS AND FUSION; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
OSTI Identifier:
1411705

Beiersdorfer, P., Magee, E. W., Hell, N., and Brown, G. V.. Imaging crystal spectrometer for high-resolution x-ray measurements on electron beam ion traps and tokamaks. United States: N. p., Web. doi:10.1063/1.4962049.
Beiersdorfer, P., Magee, E. W., Hell, N., & Brown, G. V.. Imaging crystal spectrometer for high-resolution x-ray measurements on electron beam ion traps and tokamaks. United States. doi:10.1063/1.4962049.
Beiersdorfer, P., Magee, E. W., Hell, N., and Brown, G. V.. 2016. "Imaging crystal spectrometer for high-resolution x-ray measurements on electron beam ion traps and tokamaks". United States. doi:10.1063/1.4962049. https://www.osti.gov/servlets/purl/1411705.
@article{osti_1411705,
title = {Imaging crystal spectrometer for high-resolution x-ray measurements on electron beam ion traps and tokamaks},
author = {Beiersdorfer, P. and Magee, E. W. and Hell, N. and Brown, G. V.},
abstractNote = {Here, we describe a crystal spectrometer implemented on the Livermore electron beam ion traps that employ two spherically bent quartz crystals and a cryogenically cooled back-illuminated charge-coupled device detector to measure x rays with a nominal resolving power of λ/Δλ ≥ 10 000. Its focusing properties allow us to record x rays either with the plane of dispersion perpendicular or parallel to the electron beam and, thus, to preferentially select one of the two linear x-ray polarization components. Moreover, by choice of dispersion plane and focussing conditions, we use the instrument either to image the distribution of the ions within the 2 cm long trap region, or to concentrate x rays of a given energy to a point on the detector, which optimizes the signal-to-noise ratio. We demonstrate the operation and utility of the new instrument by presenting spectra of Mo34+, which prepares the instrument for use as a core impurity diagnostic on the NSTX-U spherical torus and other magnetic fusion devices that employ molybdenum as plasma facing components.},
doi = {10.1063/1.4962049},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {2016},
month = {9}
}