An electron Bernstein wave heating scheme for the Proto-MPEX linear device

Diem, Stephanie; Green, David; Harvey, R.W.; Petrov, Yu.V.

doi:10.1063/1.5033334

Title: An electron Bernstein wave heating scheme for the Proto-MPEX linear device

Journal Article · Wed Jul 25 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5033334· OSTI ID:1833986

^[1];

^[1]; Harvey, R.W. ^[2]; Petrov, Yu.V. ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
CompX, Del Mar, CA (United States)

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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1833986

Alternate ID(s):: OSTI ID: 1461604

Journal Information:: Physics of Plasmas, Vol. 25, Issue 7; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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References (13)

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Cited By (4)

Utilization of O-X-B mode conversion of 28 GHz microwaves to heat core electrons in the upgraded Proto-MPEX Biewer, T. M.; Lau, C.; Bigelow, T. S. Physics of Plasmas, Vol. 26, Issue 5 https://doi.org/10.1063/1.5093321	journal	May 2019
Differential pumping requirements for the light-ion helicon source and heating systems of Proto-MPEX Caneses, J. F.; Piotrowicz, P. A.; Biewer, T. M. Physics of Plasmas, Vol. 25, Issue 8 https://doi.org/10.1063/1.5001519	journal	August 2018
Evidence of electron heating at different radial locations on Proto-MPEX Lau, C.; Caneses, J. F.; Bigelow, T. S. Physics of Plasmas, Vol. 26, Issue 3 https://doi.org/10.1063/1.5083814	journal	March 2019
Latest Results from Proto-MPEX and the Future Plans for MPEX Rapp, J.; Lumsdaine, A.; Beers, C. J. Fusion Science and Technology, Vol. 75, Issue 7 https://doi.org/10.1080/15361055.2019.1610315	journal	June 2019

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Title: An electron Bernstein wave heating scheme for the Proto-MPEX linear device

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