Abstract
Electron Cyclotron Resonance Heating experiments at 39 GHz and power levels similar to Ohmic heating power levels have been conducted in the TCA tokamak, in either X- or O-mode. ECRH was observed to be more efficiently absorbed for low density and low q{sub a} discharges. At low density the central electron temperature is increased by a factor of two over Ohmic cases and the stored energy increased by 40% with up to 80% of the plasma energy supplied by ECRH. During ECRH low density operation the electron energy confinement time {tau}{sub Ee} is the same as during pure Ohmic heating but {tau}{sub Ee} degrades with ECRH power at high density. The decrease in the loop voltage required to maintain a constant current during ECRH is a very reproducible quantity and can be attributed in almost all cases to the change in the electron temperature. Sawtooth stabilization was produced with a sawtooth period of up to 10 times greater than that before ECRH. This stabilization depends on the ECRH toroidal injection angle and total input power. High energy ions are observed and their production is attributed to a 3-wave interaction process. (author) 17 figs., 24 refs.
Pietrzyk, Z A;
Pochelon, A;
Behn, R;
Bondeson, A;
Dutch, M;
Goodman, T P;
Tran, M Q;
Whaley, D R
[1]
- Ecole Polytechnique Federale, Lausanne (Switzerland). Centre de Recherche en Physique des Plasma (CRPP)
Citation Formats
Pietrzyk, Z A, Pochelon, A, Behn, R, Bondeson, A, Dutch, M, Goodman, T P, Tran, M Q, and Whaley, D R.
Electron cyclotron resonance heating on the TCA tokamak.
Switzerland: N. p.,
1992.
Web.
Pietrzyk, Z A, Pochelon, A, Behn, R, Bondeson, A, Dutch, M, Goodman, T P, Tran, M Q, & Whaley, D R.
Electron cyclotron resonance heating on the TCA tokamak.
Switzerland.
Pietrzyk, Z A, Pochelon, A, Behn, R, Bondeson, A, Dutch, M, Goodman, T P, Tran, M Q, and Whaley, D R.
1992.
"Electron cyclotron resonance heating on the TCA tokamak."
Switzerland.
@misc{etde_10119925,
title = {Electron cyclotron resonance heating on the TCA tokamak}
author = {Pietrzyk, Z A, Pochelon, A, Behn, R, Bondeson, A, Dutch, M, Goodman, T P, Tran, M Q, and Whaley, D R}
abstractNote = {Electron Cyclotron Resonance Heating experiments at 39 GHz and power levels similar to Ohmic heating power levels have been conducted in the TCA tokamak, in either X- or O-mode. ECRH was observed to be more efficiently absorbed for low density and low q{sub a} discharges. At low density the central electron temperature is increased by a factor of two over Ohmic cases and the stored energy increased by 40% with up to 80% of the plasma energy supplied by ECRH. During ECRH low density operation the electron energy confinement time {tau}{sub Ee} is the same as during pure Ohmic heating but {tau}{sub Ee} degrades with ECRH power at high density. The decrease in the loop voltage required to maintain a constant current during ECRH is a very reproducible quantity and can be attributed in almost all cases to the change in the electron temperature. Sawtooth stabilization was produced with a sawtooth period of up to 10 times greater than that before ECRH. This stabilization depends on the ECRH toroidal injection angle and total input power. High energy ions are observed and their production is attributed to a 3-wave interaction process. (author) 17 figs., 24 refs.}
place = {Switzerland}
year = {1992}
month = {Aug}
}
title = {Electron cyclotron resonance heating on the TCA tokamak}
author = {Pietrzyk, Z A, Pochelon, A, Behn, R, Bondeson, A, Dutch, M, Goodman, T P, Tran, M Q, and Whaley, D R}
abstractNote = {Electron Cyclotron Resonance Heating experiments at 39 GHz and power levels similar to Ohmic heating power levels have been conducted in the TCA tokamak, in either X- or O-mode. ECRH was observed to be more efficiently absorbed for low density and low q{sub a} discharges. At low density the central electron temperature is increased by a factor of two over Ohmic cases and the stored energy increased by 40% with up to 80% of the plasma energy supplied by ECRH. During ECRH low density operation the electron energy confinement time {tau}{sub Ee} is the same as during pure Ohmic heating but {tau}{sub Ee} degrades with ECRH power at high density. The decrease in the loop voltage required to maintain a constant current during ECRH is a very reproducible quantity and can be attributed in almost all cases to the change in the electron temperature. Sawtooth stabilization was produced with a sawtooth period of up to 10 times greater than that before ECRH. This stabilization depends on the ECRH toroidal injection angle and total input power. High energy ions are observed and their production is attributed to a 3-wave interaction process. (author) 17 figs., 24 refs.}
place = {Switzerland}
year = {1992}
month = {Aug}
}