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Title: High resolution main-ion charge exchange spectroscopy in the DIII-D H-mode pedestal

A new high spatial resolution main-ion (deuterium) charge-exchange spectroscopy system covering the tokamak boundary region has been installed on the DIII-D tokamak. Sixteen new edge main-ion charge-exchange recombination sightlines have been combined with nineteen impurity sightlines in a tangentially viewing geometry on the DIII-D midplane with an interleaving design that achieves 8 mm inter-channel radial resolution for detailed profiles of main-ion temperature, velocity, charge-exchange emission, and neutral beam emission. At the plasma boundary, we find a strong enhancement of the main-ion toroidal velocity that exceeds the impurity velocity by a factor of two. Furthermore, the unique combination of experimentally measured main-ion and impurity profiles provides a powerful quasi-neutrality constraint for reconstruction of tokamak H-mode pedestals.
Authors:
ORCiD logo [1] ; ORCiD logo [2] ; ORCiD logo [3] ;  [2] ; ORCiD logo [1] ;  [2]
  1. Princeton Univ., Princeton, NJ (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Oak Ridge Associated Universities, Oak Ridge, TN (United States)
Publication Date:
Report Number(s):
5275
Journal ID: ISSN 0034-6748; RSINAK; TRN: US1701646
Grant/Contract Number:
AC02-09CH11466; FC02-04ER54698
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)
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA; Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, USA; B.A. Grierson, K.H. Burrell, C. Chrystal, R.J. Groebner, S.R. Haskey, D.H. Kaplan, "High resolution main-ion charge exchange spectroscopy in the DIII-D H-mode pedestal", Rev. Sci. Instrum. 87, 11E545 (2016)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; tokamaks
OSTI Identifier:
1340075
Alternate Identifier(s):
OSTI ID: 1371902

Grierson, B. A., Burrell, K. H., Chrystal, C., Groebner, R. J., Haskey, S. R., and Kaplan, D. H.. High resolution main-ion charge exchange spectroscopy in the DIII-D H-mode pedestal. United States: N. p., Web. doi:10.1063/1.4960604.
Grierson, B. A., Burrell, K. H., Chrystal, C., Groebner, R. J., Haskey, S. R., & Kaplan, D. H.. High resolution main-ion charge exchange spectroscopy in the DIII-D H-mode pedestal. United States. doi:10.1063/1.4960604.
Grierson, B. A., Burrell, K. H., Chrystal, C., Groebner, R. J., Haskey, S. R., and Kaplan, D. H.. 2016. "High resolution main-ion charge exchange spectroscopy in the DIII-D H-mode pedestal". United States. doi:10.1063/1.4960604. https://www.osti.gov/servlets/purl/1340075.
@article{osti_1340075,
title = {High resolution main-ion charge exchange spectroscopy in the DIII-D H-mode pedestal},
author = {Grierson, B. A. and Burrell, K. H. and Chrystal, C. and Groebner, R. J. and Haskey, S. R. and Kaplan, D. H.},
abstractNote = {A new high spatial resolution main-ion (deuterium) charge-exchange spectroscopy system covering the tokamak boundary region has been installed on the DIII-D tokamak. Sixteen new edge main-ion charge-exchange recombination sightlines have been combined with nineteen impurity sightlines in a tangentially viewing geometry on the DIII-D midplane with an interleaving design that achieves 8 mm inter-channel radial resolution for detailed profiles of main-ion temperature, velocity, charge-exchange emission, and neutral beam emission. At the plasma boundary, we find a strong enhancement of the main-ion toroidal velocity that exceeds the impurity velocity by a factor of two. Furthermore, the unique combination of experimentally measured main-ion and impurity profiles provides a powerful quasi-neutrality constraint for reconstruction of tokamak H-mode pedestals.},
doi = {10.1063/1.4960604},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {2016},
month = {9}
}