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Title: Spatial calibration of a tokamak neutral beam diagnostic using in situ neutral beam emission

Abstract

Neutral beam injection is used in tokamaks to heat, apply torque, drive non-inductive current, and diagnose plasmas. Neutral beam diagnostics need accurate spatial calibrations to benefit from the measurement localization provided by the neutral beam. A new technique has been developed that uses in-situ measurements of neutral beam emission to determine the spatial location of the beam and the associated diagnostic views. This technique was developed to improve the charge exchange recombination diagnostic (CER) at the DIII-D tokamak and uses measurements of the Doppler shift and Stark splitting of neutral beam emission made by that diagnostic. These measurements contain information about the geometric relation between the diagnostic views and the neutral beams when they are injecting power. This information is combined with standard spatial calibration measurements to create an integrated spatial calibration that provides a more complete description of the neutral beam-CER system. The integrated spatial calibration results are very similar to the standard calibration results and derived quantities from CER measurements are unchanged within their measurement errors. Lastly, the methods developed to perform the integrated spatial calibration could be useful for tokamaks with limited physical access.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [2]
  1. Oak Ridge Associated Univ., Oak Ridge, TN (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1371750
Alternate Identifier(s):
OSTI ID: 1224227
Grant/Contract Number:  
FC02-04ER54698; AC02-09CH11466
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 86; Journal Issue: 10; 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

Chrystal, Colin, Burrell, Keith H., Grierson, Brian A., and Pace, David C. Spatial calibration of a tokamak neutral beam diagnostic using in situ neutral beam emission. United States: N. p., 2015. Web. doi:10.1063/1.4933337.
Chrystal, Colin, Burrell, Keith H., Grierson, Brian A., & Pace, David C. Spatial calibration of a tokamak neutral beam diagnostic using in situ neutral beam emission. United States. https://doi.org/10.1063/1.4933337
Chrystal, Colin, Burrell, Keith H., Grierson, Brian A., and Pace, David C. 2015. "Spatial calibration of a tokamak neutral beam diagnostic using in situ neutral beam emission". United States. https://doi.org/10.1063/1.4933337. https://www.osti.gov/servlets/purl/1371750.
@article{osti_1371750,
title = {Spatial calibration of a tokamak neutral beam diagnostic using in situ neutral beam emission},
author = {Chrystal, Colin and Burrell, Keith H. and Grierson, Brian A. and Pace, David C.},
abstractNote = {Neutral beam injection is used in tokamaks to heat, apply torque, drive non-inductive current, and diagnose plasmas. Neutral beam diagnostics need accurate spatial calibrations to benefit from the measurement localization provided by the neutral beam. A new technique has been developed that uses in-situ measurements of neutral beam emission to determine the spatial location of the beam and the associated diagnostic views. This technique was developed to improve the charge exchange recombination diagnostic (CER) at the DIII-D tokamak and uses measurements of the Doppler shift and Stark splitting of neutral beam emission made by that diagnostic. These measurements contain information about the geometric relation between the diagnostic views and the neutral beams when they are injecting power. This information is combined with standard spatial calibration measurements to create an integrated spatial calibration that provides a more complete description of the neutral beam-CER system. The integrated spatial calibration results are very similar to the standard calibration results and derived quantities from CER measurements are unchanged within their measurement errors. Lastly, the methods developed to perform the integrated spatial calibration could be useful for tokamaks with limited physical access.},
doi = {10.1063/1.4933337},
url = {https://www.osti.gov/biblio/1371750}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 10,
volume = 86,
place = {United States},
year = {Tue Oct 20 00:00:00 EDT 2015},
month = {Tue Oct 20 00:00:00 EDT 2015}
}

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Free Publicly Available Full Text
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Cited by: 3 works
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Works referenced in this record:

Measurements of the internal magnetic field using the B-Stark motional Stark effect diagnostic on DIII-D (invited)
journal, October 2010


Beam emission spectroscopy as a comprehensive plasma diagnostic tool
journal, October 1993


A method for determining poloidal rotation from poloidal asymmetry in toroidal rotation (invited)
journal, November 2014


Measurements of the internal magnetic field on DIII-D using intensity and spacing of the motional Stark multiplet
journal, October 2008


Wavelength calibration of the charge exchange recombination spectroscopy system on the DIII-D tokamak
journal, January 1999


Active spectroscopic measurements of the bulk deuterium properties in the DIII-D tokamak (invited)
journal, October 2012


Analytical approximation of cross-section effects on charge exchange spectra observed in hot fusion plasmas
journal, February 1995


Charge-exchange excitation and recombination of oxygen in the I S X B tokamak
journal, November 1981


Calculation of impurity poloidal rotation from measured poloidal asymmetries in the toroidal rotation of a tokamak plasma
journal, October 2012


Deuterium velocity and temperature measurements on the DIII-D tokamak
journal, October 2010


Works referencing / citing this record:

Relative intensity calibration of the DIII-D charge-exchange recombination spectroscopy system using neutral beam injection into gas
journal, October 2018