skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Measurement of deuterium density profiles in the H-mode steep gradient region using charge exchange recombination spectroscopy on DIII-D

Abstract

Recent completion of a thirty two channel main-ion (deuterium) charge exchange recombination spectroscopy (CER) diagnostic on the DIII-D tokamak enables detailed comparisons between impurity and main-ion temperature, density, and toroidal rotation. In a H-mode DIII-D discharge, these new measurement capabilities are used to provide the deuterium density profile, demonstrate the importance of profile alignment between Thomson scattering and CER diagnostics, and aid in determining the electron temperature at the separatrix. Sixteen sightlines cover the core of the plasma and another sixteen are densely packed towards the plasma edge, providing high resolution measurements across the pedestal and steep gradient region in H-mode plasmas. Extracting useful physical quantities such as deuterium density is challenging due to multiple photoemission processes. Finally, these challenges are overcome using a detailed fitting model and by forward modeling the photoemission using the FIDASIM code, which implements a comprehensive collisional radiative model. Published by AIP Publishing.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [2];  [2];  [1]; ORCiD logo [3]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Univ. of California, Irvine, CA (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1340076
Alternate Identifier(s):
OSTI ID: 1460558
Report Number(s):
5322
Journal ID: ISSN 0034-6748; RSINAK; TRN: US1701608
Grant/Contract Number:  
AC02-09CH11466; FC02-04ER54698
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Conference: 21st Topical Conference on High-Temperature Plasma Diagnostics , Madison, WI (United States), 5-9 Jun 2016; Related Information: DIII-D data shown in this paper can be obtained in digital format by following the links at https://fusion.gat.com/global/D3D_DMP.; 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

Haskey, S. R., Grierson, B. A., Burrell, K. H., Chrystal, C., Groebner, R. J., Kaplan, D. H., Pablant, N. A., and Stagner, L. Measurement of deuterium density profiles in the H-mode steep gradient region using charge exchange recombination spectroscopy on DIII-D. United States: N. p., 2016. Web. doi:10.1063/1.4963148.
Haskey, S. R., Grierson, B. A., Burrell, K. H., Chrystal, C., Groebner, R. J., Kaplan, D. H., Pablant, N. A., & Stagner, L. Measurement of deuterium density profiles in the H-mode steep gradient region using charge exchange recombination spectroscopy on DIII-D. United States. doi:10.1063/1.4963148.
Haskey, S. R., Grierson, B. A., Burrell, K. H., Chrystal, C., Groebner, R. J., Kaplan, D. H., Pablant, N. A., and Stagner, L. Mon . "Measurement of deuterium density profiles in the H-mode steep gradient region using charge exchange recombination spectroscopy on DIII-D". United States. doi:10.1063/1.4963148. https://www.osti.gov/servlets/purl/1340076.
@article{osti_1340076,
title = {Measurement of deuterium density profiles in the H-mode steep gradient region using charge exchange recombination spectroscopy on DIII-D},
author = {Haskey, S. R. and Grierson, B. A. and Burrell, K. H. and Chrystal, C. and Groebner, R. J. and Kaplan, D. H. and Pablant, N. A. and Stagner, L.},
abstractNote = {Recent completion of a thirty two channel main-ion (deuterium) charge exchange recombination spectroscopy (CER) diagnostic on the DIII-D tokamak enables detailed comparisons between impurity and main-ion temperature, density, and toroidal rotation. In a H-mode DIII-D discharge, these new measurement capabilities are used to provide the deuterium density profile, demonstrate the importance of profile alignment between Thomson scattering and CER diagnostics, and aid in determining the electron temperature at the separatrix. Sixteen sightlines cover the core of the plasma and another sixteen are densely packed towards the plasma edge, providing high resolution measurements across the pedestal and steep gradient region in H-mode plasmas. Extracting useful physical quantities such as deuterium density is challenging due to multiple photoemission processes. Finally, these challenges are overcome using a detailed fitting model and by forward modeling the photoemission using the FIDASIM code, which implements a comprehensive collisional radiative model. Published by AIP Publishing.},
doi = {10.1063/1.4963148},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {2016},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

Save / Share:

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

  • Pablant, N. A.; Burrell, K. H.; Groebner, R. J.
  • Review of Scientific Instruments, Vol. 81, Issue 10
  • DOI: 10.1063/1.3491209

Integrated modeling applications for tokamak experiments with OMFIT
journal, July 2015


A Code that Simulates Fast-Ion D α and Neutral Particle Measurements
journal, September 2011


Reconstruction of current profile parameters and plasma shapes in tokamaks
journal, November 1985


A design retrospective of the DIII-D tokamak
journal, May 2002


High resolution main-ion charge exchange spectroscopy in the DIII-D H-mode pedestal
journal, September 2016

  • Grierson, B. A.; Burrell, K. H.; Chrystal, C.
  • Review of Scientific Instruments, Vol. 87, Issue 11
  • DOI: 10.1063/1.4960604

Initial results of the high resolution edge Thomson scattering upgrade at DIII-D
journal, October 2012

  • Eldon, D.; Bray, B. D.; Deterly, T. M.
  • Review of Scientific Instruments, Vol. 83, Issue 10
  • DOI: 10.1063/1.4738656

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

  • Grierson, B. A.; Burrell, K. H.; Chrystal, C.
  • Review of Scientific Instruments, Vol. 83, Issue 10
  • DOI: 10.1063/1.4739239

Improved edge charge exchange recombination spectroscopy in DIII-D
journal, August 2016

  • Chrystal, C.; Burrell, K. H.; Grierson, B. A.
  • Review of Scientific Instruments, Vol. 87, Issue 11
  • DOI: 10.1063/1.4958915

An upgrade of the magnetic diagnostic system of the DIII-D tokamak for non-axisymmetric measurements
journal, August 2014

  • King, J. D.; Strait, E. J.; Boivin, R. L.
  • Review of Scientific Instruments, Vol. 85, Issue 8
  • DOI: 10.1063/1.4891817

Linear ideal MHD predictions for n = 2 non-axisymmetric magnetic perturbations on DIII-D
journal, February 2014