Radially resolved active charge exchange measurements of the hydrogenic isotope fraction on DIII-D

Haskey, S. R.; Stagner, L.; Grierson, B. A.; Chrystal, C.; DeGrandchamp, G. H.; Heidbrink, W. W.; Van Zeeland, M. A.; Vincena, S.

doi:10.1063/5.0043836

Title: Radially resolved active charge exchange measurements of the hydrogenic isotope fraction on DIII-D

Abstract

Radially resolved hydrogenic isotope fraction measurement capabilities have been developed for DIII-D using the main-ion charge exchange recombination (MICER) spectroscopy system in preparation for mixed hydrogen and deuterium experiments. Constraints on the hydrogenic ion temperatures and velocities based on measurements of the impurity ion properties are required to accurately fit the spectrum. Corrections for cross sectional distortions, spatial smearing due to the halo, and a neoclassical offset between the impurity and hydrogenic toroidal rotation are applied to the constraints prior to fitting the MICER spectrum. Extensive atomic physics calculations have been performed using the FIDASIM code, which has recently been improved to allow simulations using mixtures of hydrogenic species. Overall, these results demonstrate that for the same plasma parameters, the Dα emission is 20%–30% brighter than Hα due to differences in rate coefficients associated with the different ion thermal velocities for the same temperature and therefore must be taken into consideration when calculating absolute densities. However, despite these differences, the absolute error when estimating the hydrogen isotope fraction [n_H/(n_H + n_D)] by using the Hα radiance fraction [L_Hα/(L_Hα + L_Dα)] is typically less than 5% due to the way the fraction is formed, making the radiance fraction a reasonably accuratemore »« less

Authors:

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^[3];

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Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)
Univ. of California, Irvine, CA (United States)
Univ. of California, Los Angeles, CA (United States)

Publication Date:: Tue Apr 13 00:00:00 EDT 2021

Research Org.:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

OSTI Identifier:: 1813606

Alternate Identifier(s):: OSTI ID: 1776991

Grant/Contract Number:: AC02-09CH11466; FC02-04ER54698; SC0020337

Resource Type:: Accepted Manuscript

Journal Name:: Review of Scientific Instruments

Additional Journal Information:: Journal Volume: 92; Journal Issue: 4; 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; atomic and molecular physics; charge exchange recombination spectroscopy; plasma confinement; isotopes; ions and properties; tokamaks

Citation Formats


                    Haskey, S. R., Stagner, L., Grierson, B. A., Chrystal, C., DeGrandchamp, G. H., Heidbrink, W. W., Van Zeeland, M. A., and Vincena, S. Radially resolved active charge exchange measurements of the hydrogenic isotope fraction on DIII-D.  United States: N. p., 2021. 
Web.  doi:10.1063/5.0043836.

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                    Haskey, S. R., Stagner, L., Grierson, B. A., Chrystal, C., DeGrandchamp, G. H., Heidbrink, W. W., Van Zeeland, M. A., & Vincena, S. Radially resolved active charge exchange measurements of the hydrogenic isotope fraction on DIII-D.  United States.  https://doi.org/10.1063/5.0043836

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                    Haskey, S. R., Stagner, L., Grierson, B. A., Chrystal, C., DeGrandchamp, G. H., Heidbrink, W. W., Van Zeeland, M. A., and Vincena, S. Tue .  
"Radially resolved active charge exchange measurements of the hydrogenic isotope fraction on DIII-D".  United States.  https://doi.org/10.1063/5.0043836.  https://www.osti.gov/servlets/purl/1813606.

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@article{osti_1813606,

  title        = {Radially resolved active charge exchange measurements of the hydrogenic isotope fraction on DIII-D},

  author       = {Haskey, S. R. and Stagner, L. and Grierson, B. A. and Chrystal, C. and DeGrandchamp, G. H. and Heidbrink, W. W. and Van Zeeland, M. A. and Vincena, S.},

  abstractNote = {Radially resolved hydrogenic isotope fraction measurement capabilities have been developed for DIII-D using the main-ion charge exchange recombination (MICER) spectroscopy system in preparation for mixed hydrogen and deuterium experiments. Constraints on the hydrogenic ion temperatures and velocities based on measurements of the impurity ion properties are required to accurately fit the spectrum. Corrections for cross sectional distortions, spatial smearing due to the halo, and a neoclassical offset between the impurity and hydrogenic toroidal rotation are applied to the constraints prior to fitting the MICER spectrum. Extensive atomic physics calculations have been performed using the FIDASIM code, which has recently been improved to allow simulations using mixtures of hydrogenic species. Overall, these results demonstrate that for the same plasma parameters, the Dα emission is 20%–30% brighter than Hα due to differences in rate coefficients associated with the different ion thermal velocities for the same temperature and therefore must be taken into consideration when calculating absolute densities. However, despite these differences, the absolute error when estimating the hydrogen isotope fraction [nH/(nH + nD)] by using the Hα radiance fraction [LHα/(LHα + LDα)] is typically less than 5% due to the way the fraction is formed, making the radiance fraction a reasonably accurate estimate of the isotope fraction for most cases.},

  doi          = {10.1063/5.0043836},

  journal      = {Review of Scientific Instruments},

  number       = 4,

  volume       = 92,

  place        = {United States},

  year         = {Tue Apr 13 00:00:00 EDT 2021},

  month        = {Tue Apr 13 00:00:00 EDT 2021}

}

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Works referenced in this record:

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

Meneghini, O.; Smith, S. P.; Lao, L. L.
Nuclear Fusion, Vol. 55, Issue 8
DOI: 10.1088/0029-5515/55/8/083008

The confinement of dilute populations of beam ions in the national spherical torus experiment
journal, August 2003

Heidbrink, W. W.; Miah, M.; Darrow, D.
Nuclear Fusion, Vol. 43, Issue 9
DOI: 10.1088/0029-5515/43/9/312

Analysis of neutral hydrogenic emission spectra in a tokamak
journal, October 2015

Ko, J.; Chung, J.; Jaspers, R. J. E.
Journal of Instrumentation, Vol. 10, Issue 10
DOI: 10.1088/1748-0221/10/10/p10009

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

Density interferometer using the fast Alfven wave
journal, March 2003

Watson, George; Heidbrink, W. W.
Review of Scientific Instruments, Vol. 74, Issue 3
DOI: 10.1063/1.1527222

The isotope effect on impurities and bulk ion particle transport in the Large Helical Device
journal, April 2019

Ida, K.; Sakamoto, R.; Yoshinuma, M.
Nuclear Fusion, Vol. 59, Issue 5
DOI: 10.1088/1741-4326/ab0e41

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

Isotope effects on L-H threshold and confinement in tokamak plasmas
journal, November 2017

Maggi, C. F.; Weisen, H.; Hillesheim, J. C.
Plasma Physics and Controlled Fusion, Vol. 60, Issue 1
DOI: 10.1088/1361-6587/aa9901

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

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

Hellermann, M. von; Breger, P.; Frieling, J.
Plasma Physics and Controlled Fusion, Vol. 37, Issue 2
DOI: 10.1088/0741-3335/37/2/002

Observation of the Spatial Profile of Deuterium/Hydrogen Ratio Using Bulk Charge Exchange Emission
journal, January 2018

Yamasaki, Kotaro; Ida, Katsumi; Yoshinuma, Mikirou
Plasma and Fusion Research, Vol. 13, Issue 0
DOI: 10.1585/pfr.13.1202103

Calculation of hydrogen density in toroidal plasma
journal, November 1982

Hogan, John T.
Journal of Nuclear Materials, Vol. 111-112
DOI: 10.1016/0022-3115(82)90240-9

Neoclassical poloidal and toroidal rotation in tokamaks
journal, August 1991

Kim, Y. B.; Diamond, P. H.; Groebner, R. J.
Physics of Fluids B: Plasma Physics, Vol. 3, Issue 8
DOI: 10.1063/1.859671

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

Heidbrink, W. W.; Liu, D.; Luo, Y.
Communications in Computational Physics, Vol. 10, Issue 3
DOI: 10.4208/cicp.190810.080211a

Fast H isotope and impurity mixing in ion-temperature-gradient turbulence
journal, July 2018

Bourdelle, C.; Camenen, Y.; Citrin, J.
Nuclear Fusion, Vol. 58, Issue 7
DOI: 10.1088/1741-4326/aacd57

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

Measurements of radial profile of hydrogen and deuterium density in isotope mixture plasmas using bulk charge exchange spectroscopy
journal, September 2019

Ida, K.; Yoshinuma, M.; Yamasaki, K.
Review of Scientific Instruments, Vol. 90, Issue 9
DOI: 10.1063/1.5097030

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

Control of the hydrogen:deuterium isotope mixture using pellets in JET
journal, September 2019

Valovič, M.; Baranov, Y.; Boboc, A.
Nuclear Fusion, Vol. 59, Issue 10
DOI: 10.1088/1741-4326/ab3812

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

Progress in modelling fast-ion D-alpha spectra and neutral particle analyzer fluxes using FIDASIM
journal, August 2020

Geiger, B.; Stagner, L.; Heidbrink, W. W.
Plasma Physics and Controlled Fusion, Vol. 62, Issue 10
DOI: 10.1088/1361-6587/aba8d7

Invited Review Article: Contemporary instrumentation and application of charge exchange neutral particle diagnostics in magnetic fusion energy experiments
journal, January 2008

Medley, S. S.; Donné, A. J. H.; Kaita, R.
Review of Scientific Instruments, Vol. 79, Issue 1
DOI: 10.1063/1.2823259

Ion species mix measurements in DIII-D and International Thermonuclear Experimental Reactor using ion–ion hybrid layer reflectometry
journal, October 2004

Heidbrink, W. W.; Watson, G. W.; Burrell, K. H.
Review of Scientific Instruments, Vol. 75, Issue 10
DOI: 10.1063/1.1788833

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Title: Radially resolved active charge exchange measurements of the hydrogenic isotope fraction on DIII-D

Abstract

Citation Formats

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

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Analytical approximation of cross-section effects on charge exchange spectra observed in hot fusion plasmas
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High resolution main-ion charge exchange spectroscopy in the DIII-D H-mode pedestal
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