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Title: Fast wave evanescence in filamentary boundary plasmas

Abstract

Radio frequency waves for heating and current drive of plasmas in tokamaks and other magnetic confinement devices must first traverse the scrape-off-layer (SOL) before they can be put to their intended use. The SOL plasma is strongly turbulent and intermittent in space and time. These turbulent properties of the SOL, which are not routinely taken into account in wave propagation codes, can have an important effect on the coupling of waves through an evanescent SOL or edge plasma region. The effective scale length for fast wave (FW) evanescence in the presence of short-scale field-aligned filamentary plasma turbulence is addressed in this paper. It is shown that although the FW wavelength or evanescent scale length is long compared with the dimensions of the turbulence, the FW does not simply average over the turbulent density; rather, the average is over the exponentiation rate. Implications for practical situations are discussed.

Authors:
 [1]
  1. Lodestar Research Corporation, Boulder, Colorado 80027 (United States)
Publication Date:
OSTI Identifier:
22252065
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 21; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; HEATING; LENGTH; MAGNETIC CONFINEMENT; PLASMA; PLASMA SCRAPE-OFF LAYER; RADIOWAVE RADIATION; TOKAMAK DEVICES; TURBULENCE; WAVE PROPAGATION

Citation Formats

Myra, J. R. Fast wave evanescence in filamentary boundary plasmas. United States: N. p., 2014. Web. doi:10.1063/1.4865410.
Myra, J. R. Fast wave evanescence in filamentary boundary plasmas. United States. https://doi.org/10.1063/1.4865410
Myra, J. R. 2014. "Fast wave evanescence in filamentary boundary plasmas". United States. https://doi.org/10.1063/1.4865410.
@article{osti_22252065,
title = {Fast wave evanescence in filamentary boundary plasmas},
author = {Myra, J. R.},
abstractNote = {Radio frequency waves for heating and current drive of plasmas in tokamaks and other magnetic confinement devices must first traverse the scrape-off-layer (SOL) before they can be put to their intended use. The SOL plasma is strongly turbulent and intermittent in space and time. These turbulent properties of the SOL, which are not routinely taken into account in wave propagation codes, can have an important effect on the coupling of waves through an evanescent SOL or edge plasma region. The effective scale length for fast wave (FW) evanescence in the presence of short-scale field-aligned filamentary plasma turbulence is addressed in this paper. It is shown that although the FW wavelength or evanescent scale length is long compared with the dimensions of the turbulence, the FW does not simply average over the turbulent density; rather, the average is over the exponentiation rate. Implications for practical situations are discussed.},
doi = {10.1063/1.4865410},
url = {https://www.osti.gov/biblio/22252065}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 2,
volume = 21,
place = {United States},
year = {Sat Feb 15 00:00:00 EST 2014},
month = {Sat Feb 15 00:00:00 EST 2014}
}