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Title: Helicon normal modes in Proto-MPEX

Abstract

Here, the Proto-MPEX helicon source has been operating in a high electron density 'helicon-mode'. Establishing plasma densities and magnetic field strengths under the antenna that allow for the formation of normal modes of the fast-wave are believed to be responsible for the 'helicon-mode'. A 2D finite-element full-wave model of the helicon antenna on Proto-MPEX is used to identify the fast-wave normal modes responsible for the steady-state electron density profile produced by the source. We also show through the simulation that in the regions of operation in which core power deposition is maximum the slow-wave does not deposit significant power besides directly under the antenna. In the case of a simulation where a normal mode is not excited significant edge power is deposited in the mirror region.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Illinois Urbana-Champaign, Urbana, IL (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Illinois Urbana-Champaign, Urbana, IL (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1456809
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Sources Science and Technology
Additional Journal Information:
Journal Volume: 27; Journal Issue: 5; Journal ID: ISSN 1361-6595
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; MPEX; plasma source; plasma waves; helicon source; full wave simulation; deuterium

Citation Formats

Piotrowicz, Pawel A., Caneses, Juan F., Green, David L., Goulding, Richard Howell, Lau, Cornwall H., Caughman, John B. O., Rapp, Juergen, and Ruzic, David N. Helicon normal modes in Proto-MPEX. United States: N. p., 2018. Web. doi:10.1088/1361-6595/aabd62.
Piotrowicz, Pawel A., Caneses, Juan F., Green, David L., Goulding, Richard Howell, Lau, Cornwall H., Caughman, John B. O., Rapp, Juergen, & Ruzic, David N. Helicon normal modes in Proto-MPEX. United States. doi:10.1088/1361-6595/aabd62.
Piotrowicz, Pawel A., Caneses, Juan F., Green, David L., Goulding, Richard Howell, Lau, Cornwall H., Caughman, John B. O., Rapp, Juergen, and Ruzic, David N. Tue . "Helicon normal modes in Proto-MPEX". United States. doi:10.1088/1361-6595/aabd62. https://www.osti.gov/servlets/purl/1456809.
@article{osti_1456809,
title = {Helicon normal modes in Proto-MPEX},
author = {Piotrowicz, Pawel A. and Caneses, Juan F. and Green, David L. and Goulding, Richard Howell and Lau, Cornwall H. and Caughman, John B. O. and Rapp, Juergen and Ruzic, David N.},
abstractNote = {Here, the Proto-MPEX helicon source has been operating in a high electron density 'helicon-mode'. Establishing plasma densities and magnetic field strengths under the antenna that allow for the formation of normal modes of the fast-wave are believed to be responsible for the 'helicon-mode'. A 2D finite-element full-wave model of the helicon antenna on Proto-MPEX is used to identify the fast-wave normal modes responsible for the steady-state electron density profile produced by the source. We also show through the simulation that in the regions of operation in which core power deposition is maximum the slow-wave does not deposit significant power besides directly under the antenna. In the case of a simulation where a normal mode is not excited significant edge power is deposited in the mirror region.},
doi = {10.1088/1361-6595/aabd62},
journal = {Plasma Sources Science and Technology},
number = 5,
volume = 27,
place = {United States},
year = {2018},
month = {5}
}

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

Citation Metrics:
Cited by: 5 works
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Figures / Tables:

FIG. 1 FIG. 1: a) On-axis magnetic field strength in Proto-MPEX for IH = 160 A. b) Flux line mapping and two dimensional schematic of Proto-MPEX with the locations of the helicon antenna, gas fuelling, and locations of electron density measurements made with double Langmuir probes are shown.

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    Works referencing / citing this record:

    Radio-frequency wave interactions with a plasma sheath in oblique-angle magnetic fields using a sheath impedance model
    journal, February 2019


      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.