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Title: Helicon plasma ion temperature measurements and observed ion cyclotron heating in proto-MPEX

Abstract

The Prototype-Material Plasma Exposure eXperiment (Proto-MPEX) linear plasma device is a test bed for exploring and developing plasma source concepts to be employed in the future steady-state linear device Material Plasma Exposure eXperiment (MPEX) that will study plasma-material interactions for the nuclear fusion program. The concept foresees using a helicon plasma source supplemented with electron and ion heating systems to reach necessary plasma conditions. Here in this paper, we discuss ion temperature measurements obtained from Doppler broadening of spectral lines from argon ion test particles. Plasmas produced with helicon heating alone have average ion temperatures downstream of the Helicon antenna in the range of 3 ± 1 eV; ion temperature increases to 10 ± 3 eV are observed with the addition of ion cyclotron heating (ICH). The temperatures are higher at the edge than the center of the plasma either with or without ICH. This type of profile is observed with electrons as well. Finally, a one-dimensional RF antenna model is used to show where heating of the plasma is expected.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [3]; ORCiD logo [2]
+ Show Author Affiliations
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States). Bredesen Center
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States). Dept. of Nuclear Engineering
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1458378
Alternate Identifier(s):
OSTI ID: 1417778
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 1; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Beers, Clyde J., Goulding, Richard Howell, Isler, Ralph C., Martin, Elijah H., Biewer, Theodore M., Caneses Marin, Juan F., Caughman, John B., Kafle, Nischal, and Rapp, Juergen. Helicon plasma ion temperature measurements and observed ion cyclotron heating in proto-MPEX. United States: N. p., 2018. Web. doi:10.1063/1.4994541.
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Beers, Clyde J., Goulding, Richard Howell, Isler, Ralph C., Martin, Elijah H., Biewer, Theodore M., Caneses Marin, Juan F., Caughman, John B., Kafle, Nischal, & Rapp, Juergen. Helicon plasma ion temperature measurements and observed ion cyclotron heating in proto-MPEX. United States. https://doi.org/10.1063/1.4994541
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Beers, Clyde J., Goulding, Richard Howell, Isler, Ralph C., Martin, Elijah H., Biewer, Theodore M., Caneses Marin, Juan F., Caughman, John B., Kafle, Nischal, and Rapp, Juergen. Tue . "Helicon plasma ion temperature measurements and observed ion cyclotron heating in proto-MPEX". United States. https://doi.org/10.1063/1.4994541. https://www.osti.gov/servlets/purl/1458378.
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@article{osti_1458378,
title = {Helicon plasma ion temperature measurements and observed ion cyclotron heating in proto-MPEX},
author = {Beers, Clyde J. and Goulding, Richard Howell and Isler, Ralph C. and Martin, Elijah H. and Biewer, Theodore M. and Caneses Marin, Juan F. and Caughman, John B. and Kafle, Nischal and Rapp, Juergen},
abstractNote = {The Prototype-Material Plasma Exposure eXperiment (Proto-MPEX) linear plasma device is a test bed for exploring and developing plasma source concepts to be employed in the future steady-state linear device Material Plasma Exposure eXperiment (MPEX) that will study plasma-material interactions for the nuclear fusion program. The concept foresees using a helicon plasma source supplemented with electron and ion heating systems to reach necessary plasma conditions. Here in this paper, we discuss ion temperature measurements obtained from Doppler broadening of spectral lines from argon ion test particles. Plasmas produced with helicon heating alone have average ion temperatures downstream of the Helicon antenna in the range of 3 ± 1 eV; ion temperature increases to 10 ± 3 eV are observed with the addition of ion cyclotron heating (ICH). The temperatures are higher at the edge than the center of the plasma either with or without ICH. This type of profile is observed with electrons as well. Finally, a one-dimensional RF antenna model is used to show where heating of the plasma is expected.},
doi = {10.1063/1.4994541},
journal = {Physics of Plasmas},
number = 1,
volume = 25,
place = {United States},
year = {2018},
month = {1}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.4994541
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Cited by: 5 works
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Figures / Tables:

Figure 1 Figure 1: A cross-section of the Proto-MPEX experiment and axial magnetic field strength with the 12 magnets shown as red boxes in standard operating conditions. The probe locations mark the optical viewing locations used in this experiment.
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    Works referencing / citing this record:

    Differential pumping requirements for the light-ion helicon source and heating systems of Proto-MPEX
    journal, August 2018

    • Caneses, J. F.; Piotrowicz, P. A.; Biewer, T. M.
    • Physics of Plasmas, Vol. 25, Issue 8
    • DOI: 10.1063/1.5001519

    Plasma mass separation
    journal, September 2018

    • Zweben, S. J.; Gueroult, R.; Fisch, N. J.
    • Physics of Plasmas, Vol. 25, Issue 9
    • DOI: 10.1063/1.5042845

    Radial transport modeling of high density deuterium plasmas in proto-MPEX with the B2.5-Eirene code
    journal, April 2019

    • Rapp, J.; Owen, L. W.; Canik, J.
    • Physics of Plasmas, Vol. 26, Issue 4
    • DOI: 10.1063/1.5049808

    Computational investigation of ion cyclotron heating on Proto-MPEX
    journal, March 2019

    • Piotrowicz, P. A.; Goulding, R. H.; Caneses, J. F.
    • Physics of Plasmas, Vol. 26, Issue 3
    • DOI: 10.1063/1.5065784

    Latest Results from Proto-MPEX and the Future Plans for MPEX
    journal, June 2019

    Results of Ion Cyclotron Heating Experiments on Proto-MPEX Utilizing a Movable Stainless Steel Target
    journal, June 2019

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      Figures / Tables found in this record:

      Figure 1 (p. 2)figure
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      Figure 5 (p. 3)figure
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      Figure 11 (p. 7)figure
      Figure 12 (p. 7)figure
      Figure 13 (p. 8)figure
      Figure 14 (p. 8)figure
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