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Title: Deuterium charge exchange recombination spectroscopy from the top of the pedestal to the scrape off layer in H-mode plasmas

Abstract

Recent completion of the thirty two channel main-ion (deuterium) charge exchange recombination spectroscopy (CER) diagnostic on DIII-D enables detailed comparisons between impurity and main-ion temperature, density, and toroidal rotation. Sixteen sightlines cover the core of the plasma and another sixteen are densely packed towards the edge, providing high resolution measurements of the pedestal and steep gradient edge region of H-mode plasmas. The complexities of the Dα spectrum require fitting with a comprehensive model, as well as using iterative collisional radiative modeling to determine the underlying thermal deuterium ion properties. Large differences in the structure and magnitude of impurity (C6+) and main-ion (D+) toroidal rotation profiles are seen in the H-mode pedestal. Additionally the D+ temperature can be half the value of the C6+ temperature at the separatrix and shows more of a pedestal structure. Typically only the impurity properties are measured and the main-ion properties are either assumed to be the same, or inferred using neoclassical models, which require validation in the steep gradient region. Furthermore, these measured differences have implications for transport model validation, intrinsic rotation studies, pedestal stability, and the boundary conditions for scrape off layer and plasma material interactions studies.

Authors:
 [1];  [1];  [2];  [3];  [3];  [3];  [1];  [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Univ. of California, Irvine, CA (United States)
  3. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1411208
Grant/Contract Number:  
FC02-04ER54698
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 12; Journal Issue: 10; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma diagnostics; charged-particle spectroscopy; analysis and statistical methods; data processing methods

Citation Formats

Haskey, S. R., Grierson, B. A., Stagner, L., Burrell, K. H., Chrystal, C., Groebner, R. J., Ashourvan, A., and Pablant, N. A.. Deuterium charge exchange recombination spectroscopy from the top of the pedestal to the scrape off layer in H-mode plasmas. United States: N. p., 2017. Web. https://doi.org/10.1088/1748-0221/12/10/C10013.
Haskey, S. R., Grierson, B. A., Stagner, L., Burrell, K. H., Chrystal, C., Groebner, R. J., Ashourvan, A., & Pablant, N. A.. Deuterium charge exchange recombination spectroscopy from the top of the pedestal to the scrape off layer in H-mode plasmas. United States. https://doi.org/10.1088/1748-0221/12/10/C10013
Haskey, S. R., Grierson, B. A., Stagner, L., Burrell, K. H., Chrystal, C., Groebner, R. J., Ashourvan, A., and Pablant, N. A.. Wed . "Deuterium charge exchange recombination spectroscopy from the top of the pedestal to the scrape off layer in H-mode plasmas". United States. https://doi.org/10.1088/1748-0221/12/10/C10013. https://www.osti.gov/servlets/purl/1411208.
@article{osti_1411208,
title = {Deuterium charge exchange recombination spectroscopy from the top of the pedestal to the scrape off layer in H-mode plasmas},
author = {Haskey, S. R. and Grierson, B. A. and Stagner, L. and Burrell, K. H. and Chrystal, C. and Groebner, R. J. and Ashourvan, A. and Pablant, N. A.},
abstractNote = {Recent completion of the thirty two channel main-ion (deuterium) charge exchange recombination spectroscopy (CER) diagnostic on DIII-D enables detailed comparisons between impurity and main-ion temperature, density, and toroidal rotation. Sixteen sightlines cover the core of the plasma and another sixteen are densely packed towards the edge, providing high resolution measurements of the pedestal and steep gradient edge region of H-mode plasmas. The complexities of the Dα spectrum require fitting with a comprehensive model, as well as using iterative collisional radiative modeling to determine the underlying thermal deuterium ion properties. Large differences in the structure and magnitude of impurity (C6+) and main-ion (D+) toroidal rotation profiles are seen in the H-mode pedestal. Additionally the D+ temperature can be half the value of the C6+ temperature at the separatrix and shows more of a pedestal structure. Typically only the impurity properties are measured and the main-ion properties are either assumed to be the same, or inferred using neoclassical models, which require validation in the steep gradient region. Furthermore, these measured differences have implications for transport model validation, intrinsic rotation studies, pedestal stability, and the boundary conditions for scrape off layer and plasma material interactions studies.},
doi = {10.1088/1748-0221/12/10/C10013},
journal = {Journal of Instrumentation},
number = 10,
volume = 12,
place = {United States},
year = {2017},
month = {10}
}

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Works referenced in this record:

Predicting rotation for ITER via studies of intrinsic torque and momentum transport in DIII-D
journal, May 2017

  • Chrystal, C.; Grierson, B. A.; Staebler, G. M.
  • Physics of Plasmas, Vol. 24, Issue 5
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Dependence of intrinsic torque and momentum confinement on normalized gyroradius and collisionality in the DIII-D tokamak
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Active spectroscopic measurements of the bulk deuterium properties in the DIII-D tokamak (invited)
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A Code that Simulates Fast-Ion D α and Neutral Particle Measurements
journal, September 2011


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

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  • Review of Scientific Instruments, Vol. 81, Issue 10
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Measurements of the deuterium ion toroidal rotation in the DIII-D tokamak and comparison to neoclassical theory
journal, May 2012

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Experimental evidence of edge intrinsic momentum source driven by kinetic ion loss and edge radial electric fields in tokamaks
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High resolution main-ion charge exchange spectroscopy in the DIII-D H-mode pedestal
journal, September 2016

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Measurement of deuterium density profiles in the H-mode steep gradient region using charge exchange recombination spectroscopy on DIII-D
journal, September 2016

  • Haskey, S. R.; Grierson, B. A.; Burrell, K. H.
  • Review of Scientific Instruments, Vol. 87, Issue 11
  • DOI: 10.1063/1.4963148

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

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


Toroidal rotation in DIII-D in electron cyclotron heating and Ohmic H-mode discharges
journal, September 2004

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  • Physics of Plasmas, Vol. 11, Issue 9
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Poloidal asymmetry of parallel rotation measured in ASDEX Upgrade
journal, July 2012


Collisionality dependence of edge rotation and in–out impurity asymmetries in ASDEX Upgrade H-mode plasmas
journal, October 2015


    Works referencing / citing this record:

    Active spectroscopy measurements of the deuterium temperature, rotation, and density from the core to scrape off layer on the DIII-D tokamak (invited)
    journal, October 2018

    • Haskey, S. R.; Grierson, B. A.; Stagner, L.
    • Review of Scientific Instruments, Vol. 89, Issue 10
    • DOI: 10.1063/1.5038349

    Main ion and impurity edge profile evolution across the L- to H-mode transition on DIII-D
    journal, August 2018

    • Haskey, S. R.; Grierson, B. A.; Chrystal, C.
    • Plasma Physics and Controlled Fusion, Vol. 60, Issue 10
    • DOI: 10.1088/1361-6587/aad702

    Deuterium temperature, drift velocity, and density measurements in non-Maxwellian plasmas at ASDEX Upgrade
    journal, February 2018