Mode conversion in the vicinity of a fast wave antenna in ICRF-heating

Mikko Alava, Jukka Heikkinen

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

Mode conversion of the magnetosonic wave to short wavelength modes in the edge plasma near the fast wave antenna is studied for ion cyclotron heating on Tokamaks.
Analytical and numerical methods are developed to calculate the conversion due to a lower hybrid resonance and a fast wave polarization gradient for strongly inhomogeneous edge conditions. The results for an antenna radiating at high poloidal wavenumbers show that for low values of the toroidal refractive index a nearly complete conversion into the ion Bernstein mode occurs, provided the plasma density near the Faraday shield is at most of the order of the density at the lower hybrid resonance.
For the present type of loop antennae the feeders effectively suppress radiation at high poloidal wavenumbers and the parasitic coupling remains low.
Original languageEnglish
Pages (from-to)957-976
JournalPlasma Physics and Controlled Fusion
Volume34
Issue number6
DOIs
Publication statusPublished - 1992
MoE publication typeA1 Journal article-refereed

Fingerprint

antennas
Antennas
Heating
heating
loop antennas
polarization (waves)
Loop antennas
feeders
Plasma density
Ions
Cyclotrons
plasma density
cyclotrons
Numerical methods
Refractive index
ions
Polarization
refractivity
Plasmas
Radiation

Cite this

Alava, Mikko ; Heikkinen, Jukka. / Mode conversion in the vicinity of a fast wave antenna in ICRF-heating. In: Plasma Physics and Controlled Fusion. 1992 ; Vol. 34, No. 6. pp. 957-976.
@article{34de43c570294768a7097e726808df23,
title = "Mode conversion in the vicinity of a fast wave antenna in ICRF-heating",
abstract = "Mode conversion of the magnetosonic wave to short wavelength modes in the edge plasma near the fast wave antenna is studied for ion cyclotron heating on Tokamaks. Analytical and numerical methods are developed to calculate the conversion due to a lower hybrid resonance and a fast wave polarization gradient for strongly inhomogeneous edge conditions. The results for an antenna radiating at high poloidal wavenumbers show that for low values of the toroidal refractive index a nearly complete conversion into the ion Bernstein mode occurs, provided the plasma density near the Faraday shield is at most of the order of the density at the lower hybrid resonance. For the present type of loop antennae the feeders effectively suppress radiation at high poloidal wavenumbers and the parasitic coupling remains low.",
author = "Mikko Alava and Jukka Heikkinen",
note = "Project code: YDI0030",
year = "1992",
doi = "10.1088/0741-3335/34/6/006",
language = "English",
volume = "34",
pages = "957--976",
journal = "Plasma Physics and Controlled Fusion",
issn = "0741-3335",
publisher = "Institute of Physics IOP",
number = "6",

}

Mode conversion in the vicinity of a fast wave antenna in ICRF-heating. / Alava, Mikko; Heikkinen, Jukka.

In: Plasma Physics and Controlled Fusion, Vol. 34, No. 6, 1992, p. 957-976.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Mode conversion in the vicinity of a fast wave antenna in ICRF-heating

AU - Alava, Mikko

AU - Heikkinen, Jukka

N1 - Project code: YDI0030

PY - 1992

Y1 - 1992

N2 - Mode conversion of the magnetosonic wave to short wavelength modes in the edge plasma near the fast wave antenna is studied for ion cyclotron heating on Tokamaks. Analytical and numerical methods are developed to calculate the conversion due to a lower hybrid resonance and a fast wave polarization gradient for strongly inhomogeneous edge conditions. The results for an antenna radiating at high poloidal wavenumbers show that for low values of the toroidal refractive index a nearly complete conversion into the ion Bernstein mode occurs, provided the plasma density near the Faraday shield is at most of the order of the density at the lower hybrid resonance. For the present type of loop antennae the feeders effectively suppress radiation at high poloidal wavenumbers and the parasitic coupling remains low.

AB - Mode conversion of the magnetosonic wave to short wavelength modes in the edge plasma near the fast wave antenna is studied for ion cyclotron heating on Tokamaks. Analytical and numerical methods are developed to calculate the conversion due to a lower hybrid resonance and a fast wave polarization gradient for strongly inhomogeneous edge conditions. The results for an antenna radiating at high poloidal wavenumbers show that for low values of the toroidal refractive index a nearly complete conversion into the ion Bernstein mode occurs, provided the plasma density near the Faraday shield is at most of the order of the density at the lower hybrid resonance. For the present type of loop antennae the feeders effectively suppress radiation at high poloidal wavenumbers and the parasitic coupling remains low.

U2 - 10.1088/0741-3335/34/6/006

DO - 10.1088/0741-3335/34/6/006

M3 - Article

VL - 34

SP - 957

EP - 976

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 6

ER -