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Title: Characterization of the helicon plasma flux to the target of Proto-MPEX

Abstract

The ITER divertor will have to handle the boundary plasma power exhaust in the form of high heat and particle flux. The Prototype Material Plasma Exposure eXperiment (Proto-MPEX) is a plasma source development device for the proposed Material Plasma Exposure eXperiment (MPEX), which is intended to create fusion reactor divertor-like plasma conditions for studying plasma material interactions. Here, ion fluxes to various targets within Proto-MPEX are found to be 5 ± 2.5 × 1023 m–2s-1 when using only a helicon plasma source. The fluxes along the flux tube are compared for both 30 cm in front of the target and a few cm in front of the target. The emission intensity fall-off distance in front of the target is studied via Balmer series from a visible camera looking at the target. As a result, this fall-off distance of ~2–4 cm and the dissociation and ionization mean free path of D2 being over 0.5 m leads to a conclusion that Proto-MPEX is not in a high recycling regime with helicon only plasmas.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [1];  [1];  [1]; ORCiD logo [3]; ORCiD logo [2]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (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:
1486956
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Fusion Engineering and Design
Additional Journal Information:
Journal Volume: 138; Journal Issue: C; Journal ID: ISSN 0920-3796
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Proto-MPEX; Ion flux; Helicon antenna

Citation Formats

Beers, Clyde J., Lindquist, Elizabeth G., Biewer, Theodore M., Caneses, Juan F., Caughman, John B. O., Goulding, Richard Howell, Kafle, Nischal, Ray, Holly B., Showers, Melissa A., Zinkle, Steven J., and Rapp, Juergen. Characterization of the helicon plasma flux to the target of Proto-MPEX. United States: N. p., 2018. Web. doi:10.1016/j.fusengdes.2018.11.056.
Beers, Clyde J., Lindquist, Elizabeth G., Biewer, Theodore M., Caneses, Juan F., Caughman, John B. O., Goulding, Richard Howell, Kafle, Nischal, Ray, Holly B., Showers, Melissa A., Zinkle, Steven J., & Rapp, Juergen. Characterization of the helicon plasma flux to the target of Proto-MPEX. United States. https://doi.org/10.1016/j.fusengdes.2018.11.056
Beers, Clyde J., Lindquist, Elizabeth G., Biewer, Theodore M., Caneses, Juan F., Caughman, John B. O., Goulding, Richard Howell, Kafle, Nischal, Ray, Holly B., Showers, Melissa A., Zinkle, Steven J., and Rapp, Juergen. 2018. "Characterization of the helicon plasma flux to the target of Proto-MPEX". United States. https://doi.org/10.1016/j.fusengdes.2018.11.056. https://www.osti.gov/servlets/purl/1486956.
@article{osti_1486956,
title = {Characterization of the helicon plasma flux to the target of Proto-MPEX},
author = {Beers, Clyde J. and Lindquist, Elizabeth G. and Biewer, Theodore M. and Caneses, Juan F. and Caughman, John B. O. and Goulding, Richard Howell and Kafle, Nischal and Ray, Holly B. and Showers, Melissa A. and Zinkle, Steven J. and Rapp, Juergen},
abstractNote = {The ITER divertor will have to handle the boundary plasma power exhaust in the form of high heat and particle flux. The Prototype Material Plasma Exposure eXperiment (Proto-MPEX) is a plasma source development device for the proposed Material Plasma Exposure eXperiment (MPEX), which is intended to create fusion reactor divertor-like plasma conditions for studying plasma material interactions. Here, ion fluxes to various targets within Proto-MPEX are found to be 5 ± 2.5 × 1023 m–2s-1 when using only a helicon plasma source. The fluxes along the flux tube are compared for both 30 cm in front of the target and a few cm in front of the target. The emission intensity fall-off distance in front of the target is studied via Balmer series from a visible camera looking at the target. As a result, this fall-off distance of ~2–4 cm and the dissociation and ionization mean free path of D2 being over 0.5 m leads to a conclusion that Proto-MPEX is not in a high recycling regime with helicon only plasmas.},
doi = {10.1016/j.fusengdes.2018.11.056},
url = {https://www.osti.gov/biblio/1486956}, journal = {Fusion Engineering and Design},
issn = {0920-3796},
number = C,
volume = 138,
place = {United States},
year = {Sat Dec 08 00:00:00 EST 2018},
month = {Sat Dec 08 00:00:00 EST 2018}
}

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Works referenced in this record:

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journal, July 2017


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journal, January 2018


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journal, August 2016


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journal, November 2017


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journal, August 2017


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journal, May 2018


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Works referencing / citing this record:

Utilization of O-X-B mode conversion of 28 GHz microwaves to heat core electrons in the upgraded Proto-MPEX
journal, May 2019