Computational investigation of ion cyclotron heating on Proto-MPEX
Abstract
Ion cyclotron heating (ICH) on the Prototype Material Plasma Exposure eXperiment (Proto-MPEX) is to be accomplished using the “beach-heating” technique. Beach heating has not been previously demonstrated to efficiently heat core ions at the high electron density values present in Proto-MPEX. This work numerically investigates the wave propagation characteristics of the ICH region on Proto-MPEX to explore avenues for efficient core ion heating. The analysis reveals that finite electron temperature effects are required to predict core ion heating. Cold plasma dispersion analysis and full-wave simulations show that the inertial Alfvén wave (IAW) is restricted from coupling power into the core plasma because (1) the group velocity is too shallow for its energy to penetrate into the core before damping in the periphery and (2) when operating in a magnetic field where ω/ωci ≳ 0.7, the IAW is cut off from the core plasma by the Alfvén resonance. However, including kinetic effects shows that the kinetic Alfvén wave (KAW) can propagate in the electron temperature regime in Proto-MPEX. Full-wave simulations show that when the electron temperature is increased to Te > 2 eV and the edge electron density is sufficiently high needge > 1 × 1017 m-3, ion power absorption inmore »
- Authors:
-
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); University of Illinois Urbana-Champaign, IL (United States)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- University of Illinois Urbana-Champaign, 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:
- 1649631
- Alternate Identifier(s):
- OSTI ID: 1502273
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 26; Journal Issue: 3; 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; Frequency measurement; wave model; wave mechanics; dispersion function; plasma waves; electron density; dielectric properties
Citation Formats
Piotrowicz, Pawel A., Goulding, Richard H., Caneses, Juan F., Green, D. L., Caughman, John B. O., Lau, Cornwall, Rapp, Juergen, and Ruzic, David N. Computational investigation of ion cyclotron heating on Proto-MPEX. United States: N. p., 2019.
Web. doi:10.1063/1.5065784.
Piotrowicz, Pawel A., Goulding, Richard H., Caneses, Juan F., Green, D. L., Caughman, John B. O., Lau, Cornwall, Rapp, Juergen, & Ruzic, David N. Computational investigation of ion cyclotron heating on Proto-MPEX. United States. https://doi.org/10.1063/1.5065784
Piotrowicz, Pawel A., Goulding, Richard H., Caneses, Juan F., Green, D. L., Caughman, John B. O., Lau, Cornwall, Rapp, Juergen, and Ruzic, David N. Thu .
"Computational investigation of ion cyclotron heating on Proto-MPEX". United States. https://doi.org/10.1063/1.5065784. https://www.osti.gov/servlets/purl/1649631.
@article{osti_1649631,
title = {Computational investigation of ion cyclotron heating on Proto-MPEX},
author = {Piotrowicz, Pawel A. and Goulding, Richard H. and Caneses, Juan F. and Green, D. L. and Caughman, John B. O. and Lau, Cornwall and Rapp, Juergen and Ruzic, David N.},
abstractNote = {Ion cyclotron heating (ICH) on the Prototype Material Plasma Exposure eXperiment (Proto-MPEX) is to be accomplished using the “beach-heating” technique. Beach heating has not been previously demonstrated to efficiently heat core ions at the high electron density values present in Proto-MPEX. This work numerically investigates the wave propagation characteristics of the ICH region on Proto-MPEX to explore avenues for efficient core ion heating. The analysis reveals that finite electron temperature effects are required to predict core ion heating. Cold plasma dispersion analysis and full-wave simulations show that the inertial Alfvén wave (IAW) is restricted from coupling power into the core plasma because (1) the group velocity is too shallow for its energy to penetrate into the core before damping in the periphery and (2) when operating in a magnetic field where ω/ωci ≳ 0.7, the IAW is cut off from the core plasma by the Alfvén resonance. However, including kinetic effects shows that the kinetic Alfvén wave (KAW) can propagate in the electron temperature regime in Proto-MPEX. Full-wave simulations show that when the electron temperature is increased to Te > 2 eV and the edge electron density is sufficiently high needge > 1 × 1017 m-3, ion power absorption in the core increases substantially (≈25% of total power). Here, the increase in ion power absorption in the core is attributed to the propagation of the KAW. Calculations of electron and ion power absorption show that the electron heating is localized around the Alfvén resonance, while the ion heating is localized at the fundamental ion cyclotron resonance.},
doi = {10.1063/1.5065784},
journal = {Physics of Plasmas},
number = 3,
volume = 26,
place = {United States},
year = {Thu Mar 21 00:00:00 EDT 2019},
month = {Thu Mar 21 00:00:00 EDT 2019}
}
Web of Science
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