Abstract
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 language | English |
|---|---|
| Pages (from-to) | 957-976 |
| Journal | Plasma Physics and Controlled Fusion |
| Volume | 34 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 1992 |
| MoE publication type | A1 Journal article-refereed |
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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 journal › Article › Scientific › peer-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 -