Direct measurement of the transition from edge to core power coupling in a light-ion helicon source
Abstract
Here, we present time-resolved measurements of an edge-to-core power transition in a light-ion (deuterium) helicon discharge in the form of infra-red camera imaging of a thin stainless steel target plate on the Proto-Material Exposure eXperiment device. The time-resolved images measure the two-dimensional distribution of power deposition in the helicon discharge. The discharge displays a mode transition characterized by a significant increase in the on-axis electron density and core power coupling, suppression of edge power coupling, and the formation of a fast-wave radial eigenmode. Although the self-consistent mechanism that drives this transition is not yet understood, the edge-to-core power transition displays characteristics that are consistent with the discharge entering a slow-wave anti-resonant regime. RF magnetic field measurements made across the plasma column, together with the power deposition results, provide direct evidence to support the suppression of the slow-wave in favor of core plasma production by the fast-wave in a light-ion helicon source.
- Authors:
-
[2];
[3];
[3];
[3];
[3];
[3];
- Univ. of Illinois in Urbana-Champaign, Champaign, IL (United States)
- 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:
- 1456815
- Alternate Identifier(s):
- OSTI ID: 1435671
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 25; Journal Issue: 5; 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; helicon plasma; MPEX; deuterium
Citation Formats
Piotrowicz, Pawel A., Caneses, Juan F., Showers, Melissa A., Green, Davil L., Goulding, Richard Howell, Caughman, John B. O., Biewer, Theodore M., Rapp, Juergen, and Ruzic, David N. Direct measurement of the transition from edge to core power coupling in a light-ion helicon source. United States: N. p., 2018.
Web. doi:10.1063/1.5023924.
Piotrowicz, Pawel A., Caneses, Juan F., Showers, Melissa A., Green, Davil L., Goulding, Richard Howell, Caughman, John B. O., Biewer, Theodore M., Rapp, Juergen, & Ruzic, David N. Direct measurement of the transition from edge to core power coupling in a light-ion helicon source. United States. https://doi.org/10.1063/1.5023924
Piotrowicz, Pawel A., Caneses, Juan F., Showers, Melissa A., Green, Davil L., Goulding, Richard Howell, Caughman, John B. O., Biewer, Theodore M., Rapp, Juergen, and Ruzic, David N. Wed .
"Direct measurement of the transition from edge to core power coupling in a light-ion helicon source". United States. https://doi.org/10.1063/1.5023924. https://www.osti.gov/servlets/purl/1456815.
@article{osti_1456815,
title = {Direct measurement of the transition from edge to core power coupling in a light-ion helicon source},
author = {Piotrowicz, Pawel A. and Caneses, Juan F. and Showers, Melissa A. and Green, Davil L. and Goulding, Richard Howell and Caughman, John B. O. and Biewer, Theodore M. and Rapp, Juergen and Ruzic, David N.},
abstractNote = {Here, we present time-resolved measurements of an edge-to-core power transition in a light-ion (deuterium) helicon discharge in the form of infra-red camera imaging of a thin stainless steel target plate on the Proto-Material Exposure eXperiment device. The time-resolved images measure the two-dimensional distribution of power deposition in the helicon discharge. The discharge displays a mode transition characterized by a significant increase in the on-axis electron density and core power coupling, suppression of edge power coupling, and the formation of a fast-wave radial eigenmode. Although the self-consistent mechanism that drives this transition is not yet understood, the edge-to-core power transition displays characteristics that are consistent with the discharge entering a slow-wave anti-resonant regime. RF magnetic field measurements made across the plasma column, together with the power deposition results, provide direct evidence to support the suppression of the slow-wave in favor of core plasma production by the fast-wave in a light-ion helicon source.},
doi = {10.1063/1.5023924},
journal = {Physics of Plasmas},
number = 5,
volume = 25,
place = {United States},
year = {Wed May 02 00:00:00 EDT 2018},
month = {Wed May 02 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
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
Computational investigation of ion cyclotron heating on Proto-MPEX
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- Physics of Plasmas, Vol. 26, Issue 3
Evidence of electron heating at different radial locations on Proto-MPEX
journal, March 2019
- Lau, C.; Caneses, J. F.; Bigelow, T. S.
- Physics of Plasmas, Vol. 26, Issue 3
Utilization of O-X-B mode conversion of 28 GHz microwaves to heat core electrons in the upgraded Proto-MPEX
journal, May 2019
- Biewer, T. M.; Lau, C.; Bigelow, T. S.
- Physics of Plasmas, Vol. 26, Issue 5