Mode conversion in cold low-density plasma with a sheared magnetic field
Abstract
Here, a theory is proposed that describes mutual conversion of two electromagnetic modes in cold low-density plasma, specifically, in the high-frequency limit where the ion response is negligible. In contrast to the classic (Landau–Zener-type) theory of mode conversion, the region of resonant coupling in low-density plasma is not necessarily narrow, so the coupling matrix cannot be approximated with its first-order Taylor expansion; also, the initial conditions are set up differently. For the case of strong magnetic shear, a simple method is identified for preparing a two-mode wave such that it transforms into a single-mode wave upon entering high-density plasma. The theory can be used for reduced modeling of wave-power input in fusion plasmas. In particular, applications are envisioned in stellarator research, where the mutual conversion of two electromagnetic modes near the plasma edge is a known issue.
- Authors:
-
[1];
[2];
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- National Institute for Fusion Science, National Institutes of National Sciences, Gifu (Japan)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1419796
- Grant/Contract Number:
- AC02-09CH11466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 24; Journal Issue: 12; 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
Citation Formats
Dodin, I. Y., Ruiz, D. E., and Kubo, S. Mode conversion in cold low-density plasma with a sheared magnetic field. United States: N. p., 2017.
Web. doi:10.1063/1.5003931.
Dodin, I. Y., Ruiz, D. E., & Kubo, S. Mode conversion in cold low-density plasma with a sheared magnetic field. United States. https://doi.org/10.1063/1.5003931
Dodin, I. Y., Ruiz, D. E., and Kubo, S. Tue .
"Mode conversion in cold low-density plasma with a sheared magnetic field". United States. https://doi.org/10.1063/1.5003931. https://www.osti.gov/servlets/purl/1419796.
@article{osti_1419796,
title = {Mode conversion in cold low-density plasma with a sheared magnetic field},
author = {Dodin, I. Y. and Ruiz, D. E. and Kubo, S.},
abstractNote = {Here, a theory is proposed that describes mutual conversion of two electromagnetic modes in cold low-density plasma, specifically, in the high-frequency limit where the ion response is negligible. In contrast to the classic (Landau–Zener-type) theory of mode conversion, the region of resonant coupling in low-density plasma is not necessarily narrow, so the coupling matrix cannot be approximated with its first-order Taylor expansion; also, the initial conditions are set up differently. For the case of strong magnetic shear, a simple method is identified for preparing a two-mode wave such that it transforms into a single-mode wave upon entering high-density plasma. The theory can be used for reduced modeling of wave-power input in fusion plasmas. In particular, applications are envisioned in stellarator research, where the mutual conversion of two electromagnetic modes near the plasma edge is a known issue.},
doi = {10.1063/1.5003931},
journal = {Physics of Plasmas},
number = 12,
volume = 24,
place = {United States},
year = {Tue Dec 19 00:00:00 EST 2017},
month = {Tue Dec 19 00:00:00 EST 2017}
}
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Figures / Tables:
FIG. 1: Numerical solutions of Eq. (45) for |$\mathcal{a}$O|2 for two sample profiles: (a) s(τ) = 0.02τ2 and (b) s(τ) = 40 tanh[(τ/15)3]. The envelope $\mathcal{a}$O is measured in units $\mathcal{\bar{a}}$ such that |$\mathcal{\bar{a}}$|2 is the total number of quanta, which is conserved [Eq. (36)]. The initial conditions are $\mathcal{a}$O(0)more »
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Works referencing / citing this record:
Quasioptical modeling of wave beams with and without mode conversion. I. Basic theory
journal, July 2019
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