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Title: The charge exchange recombination spectroscopy diagnostic on the upgraded Lithium Tokamak eXperiment (LTX-β)

Abstract

The Lithium Tokamak eXperiment has undergone an upgrade to LTX-β, a major part of which is the addition of neutral beam injection (NBI). NBI has allowed for a new charge exchange recombination spectroscopy (CHERS) system to be installed in order to measure impurity concentrations, ion temperature, and toroidal velocity. Previously on LTX measuring these parameters relied on passive spectroscopy and inversion techniques and had large uncertainty. The CHERS system has 52 total views, split into four groups of 13, half facing toward the beam and half symmetrically facing away from the beam, so the background non-beam related emission can be simultaneously subtracted. Both sets of views sample a major radius of 27-59 cm, with resolution through the beam of 1.5-2.5 cm. LTX-β is expected to have its magnetic axis near 35 cm, with minor radii of 18-23 cm. Three separate spectrometers will be used for the diagnostic, giving the system great flexibility to simultaneously measure emission from multiple impurity lines. The viewing optics are f/1.8, allowing all of the spectrometers to be fully illuminated. Design and calibration of the system as well as the advantages of various configurations of the spectrometers will be highlighted.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2];  [2];  [2]
  1. ORNL
  2. Princeton Plasma Physics Laboratory (PPPL)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1559732
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Journal Volume: 89; Journal Issue: 10; Conference: High-Temperature Plasma Diagnostics (HTPD 2018) - San Diego, California, United States of America - 4/15/2018 8:00:00 AM-4/19/2018 8:00:00 AM
Country of Publication:
United States
Language:
English

Citation Formats

Elliott, Drew, Biewer, Theodore, Boyle, D, Kaita, R., and Majeski, R. The charge exchange recombination spectroscopy diagnostic on the upgraded Lithium Tokamak eXperiment (LTX-β). United States: N. p., 2018. Web. doi:10.1063/1.5039368.
Elliott, Drew, Biewer, Theodore, Boyle, D, Kaita, R., & Majeski, R. The charge exchange recombination spectroscopy diagnostic on the upgraded Lithium Tokamak eXperiment (LTX-β). United States. doi:10.1063/1.5039368.
Elliott, Drew, Biewer, Theodore, Boyle, D, Kaita, R., and Majeski, R. Mon . "The charge exchange recombination spectroscopy diagnostic on the upgraded Lithium Tokamak eXperiment (LTX-β)". United States. doi:10.1063/1.5039368. https://www.osti.gov/servlets/purl/1559732.
@article{osti_1559732,
title = {The charge exchange recombination spectroscopy diagnostic on the upgraded Lithium Tokamak eXperiment (LTX-β)},
author = {Elliott, Drew and Biewer, Theodore and Boyle, D and Kaita, R. and Majeski, R},
abstractNote = {The Lithium Tokamak eXperiment has undergone an upgrade to LTX-β, a major part of which is the addition of neutral beam injection (NBI). NBI has allowed for a new charge exchange recombination spectroscopy (CHERS) system to be installed in order to measure impurity concentrations, ion temperature, and toroidal velocity. Previously on LTX measuring these parameters relied on passive spectroscopy and inversion techniques and had large uncertainty. The CHERS system has 52 total views, split into four groups of 13, half facing toward the beam and half symmetrically facing away from the beam, so the background non-beam related emission can be simultaneously subtracted. Both sets of views sample a major radius of 27-59 cm, with resolution through the beam of 1.5-2.5 cm. LTX-β is expected to have its magnetic axis near 35 cm, with minor radii of 18-23 cm. Three separate spectrometers will be used for the diagnostic, giving the system great flexibility to simultaneously measure emission from multiple impurity lines. The viewing optics are f/1.8, allowing all of the spectrometers to be fully illuminated. Design and calibration of the system as well as the advantages of various configurations of the spectrometers will be highlighted.},
doi = {10.1063/1.5039368},
journal = {},
issn = {0034--6748},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {10}
}

Conference:
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