An electron Bernstein wave heating scheme for the Proto-MPEX linear device
Abstract
Linear plasma devices, such as the Prototype Material Plasma Exposure eXperiment (Proto-MPEX), are an economic method to study plasma-material interactions under high heat and particle fluxes. The Proto-MPEX device at Oak Ridge National Laboratory is a high-density helicon plasma generator with additional resonant electron heating to study plasma-material interactions in ITER-like conditions. Here, we present modeling results of an electron Bernstein wave (EBW) heating scheme for this device using a microwave-based system. A 28 GHz injection system is available to provide power levels up to 100 kW injected into low electron temperature and high electron density plasmas. A modified version of the GENRAY ray-tracing code, GENRAY-C, has been used to determine the EBW and electron cyclotron heating wave accessibility for these overdense plasmas. Modeling has shown that greater than 80% of mode conversion from the ordinary mode to the EBW is possible for 28 GHz injection in Proto-MPEX. Calculations show that by utilizing the effects of Doppler-shifted resonance absorption, power deposition near the core is possible. Finally, significant collisional damping, leading to edge absorption, is expected to occur for neutral pressures >1.0 mTorr; however, experiments can be designed to minimize these effects.
- Authors:
-
[1];
[1];
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- CompX, Del Mar, CA (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1833986
- Alternate Identifier(s):
- OSTI ID: 1461604
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 25; Journal Issue: 7; 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; Plasma confinement; Plasma heating; Plasma devices; Collision frequency; Cyclotrons; Launch angle; Electron density; Plasma material interactions; Computer graphics; Doppler effect
Citation Formats
Diem, Stephanie, Green, David, Harvey, R.W., and Petrov, Yu.V. An electron Bernstein wave heating scheme for the Proto-MPEX linear device. United States: N. p., 2018.
Web. doi:10.1063/1.5033334.
Diem, Stephanie, Green, David, Harvey, R.W., & Petrov, Yu.V. An electron Bernstein wave heating scheme for the Proto-MPEX linear device. United States. https://doi.org/10.1063/1.5033334
Diem, Stephanie, Green, David, Harvey, R.W., and Petrov, Yu.V. Wed .
"An electron Bernstein wave heating scheme for the Proto-MPEX linear device". United States. https://doi.org/10.1063/1.5033334. https://www.osti.gov/servlets/purl/1833986.
@article{osti_1833986,
title = {An electron Bernstein wave heating scheme for the Proto-MPEX linear device},
author = {Diem, Stephanie and Green, David and Harvey, R.W. and Petrov, Yu.V.},
abstractNote = {Linear plasma devices, such as the Prototype Material Plasma Exposure eXperiment (Proto-MPEX), are an economic method to study plasma-material interactions under high heat and particle fluxes. The Proto-MPEX device at Oak Ridge National Laboratory is a high-density helicon plasma generator with additional resonant electron heating to study plasma-material interactions in ITER-like conditions. Here, we present modeling results of an electron Bernstein wave (EBW) heating scheme for this device using a microwave-based system. A 28 GHz injection system is available to provide power levels up to 100 kW injected into low electron temperature and high electron density plasmas. A modified version of the GENRAY ray-tracing code, GENRAY-C, has been used to determine the EBW and electron cyclotron heating wave accessibility for these overdense plasmas. Modeling has shown that greater than 80% of mode conversion from the ordinary mode to the EBW is possible for 28 GHz injection in Proto-MPEX. Calculations show that by utilizing the effects of Doppler-shifted resonance absorption, power deposition near the core is possible. Finally, significant collisional damping, leading to edge absorption, is expected to occur for neutral pressures >1.0 mTorr; however, experiments can be designed to minimize these effects.},
doi = {10.1063/1.5033334},
journal = {Physics of Plasmas},
number = 7,
volume = 25,
place = {United States},
year = {Wed Jul 25 00:00:00 EDT 2018},
month = {Wed Jul 25 00:00:00 EDT 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
- Biewer, T. M.; Lau, C.; Bigelow, T. S.
- Physics of Plasmas, Vol. 26, Issue 5
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
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
Latest Results from Proto-MPEX and the Future Plans for MPEX
journal, June 2019
- Rapp, J.; Lumsdaine, A.; Beers, C. J.
- Fusion Science and Technology, Vol. 75, Issue 7