Abstract
The presence of these resonances causes parasitic absorption, competing with the electron Landau damping and transit time magnetic pumping responsible for the fast wave current drive. In the present study, neglecting effects from toroidicity, the mode conversion at the Alfven resonance is shown to be of the order of 5 to 10% in the current drive scenarios for the planned ITER experiment.
If the single pass absorption in the centre can be made sufficiently high, the conversion at the Alfven resonance becomes negligible
| Original language | English |
|---|---|
| Pages (from-to) | 881-889 |
| Journal | Nuclear Fusion |
| Volume | 35 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 1995 |
| MoE publication type | A1 Journal article-refereed |
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Investigation of the effect of alfvén resonance mode conversion on fast wave current drive in ITER. / Alava, Mikko; Heikkinen, Jukka; Hellsten, Thorbjörn.
In: Nuclear Fusion, Vol. 35, No. 7, 1995, p. 881-889.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - Investigation of the effect of alfvén resonance mode conversion on fast wave current drive in ITER
AU - Alava, Mikko
AU - Heikkinen, Jukka
AU - Hellsten, Thorbjörn
N1 - Project code: ENE0630
PY - 1995
Y1 - 1995
N2 - In order to reduce or to avoid ion cyclotron damping, the use of frequencies below the ion cyclotron frequency of minority ion species or the second harmonic of majority ion species has been proposed for fast wave current drive based on direct electron absorption. For these scenarios, the Alfven or ion-ion hybrid resonance can appear on the high field side of a tokamak. The presence of these resonances causes parasitic absorption, competing with the electron Landau damping and transit time magnetic pumping responsible for the fast wave current drive. In the present study, neglecting effects from toroidicity, the mode conversion at the Alfven resonance is shown to be of the order of 5 to 10% in the current drive scenarios for the planned ITER experiment. If the single pass absorption in the centre can be made sufficiently high, the conversion at the Alfven resonance becomes negligible
AB - In order to reduce or to avoid ion cyclotron damping, the use of frequencies below the ion cyclotron frequency of minority ion species or the second harmonic of majority ion species has been proposed for fast wave current drive based on direct electron absorption. For these scenarios, the Alfven or ion-ion hybrid resonance can appear on the high field side of a tokamak. The presence of these resonances causes parasitic absorption, competing with the electron Landau damping and transit time magnetic pumping responsible for the fast wave current drive. In the present study, neglecting effects from toroidicity, the mode conversion at the Alfven resonance is shown to be of the order of 5 to 10% in the current drive scenarios for the planned ITER experiment. If the single pass absorption in the centre can be made sufficiently high, the conversion at the Alfven resonance becomes negligible
U2 - 10.1088/0029-5515/35/7/I12
DO - 10.1088/0029-5515/35/7/I12
M3 - Article
VL - 35
SP - 881
EP - 889
JO - Nuclear Fusion
JF - Nuclear Fusion
SN - 0029-5515
IS - 7
ER -