Investigation of the effect of alfvén resonance mode conversion on fast wave current drive in ITER

Mikko Alava, Jukka Heikkinen, Thorbjörn Hellsten

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

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
Original languageEnglish
Pages (from-to)881-889
JournalNuclear Fusion
Volume35
Issue number7
DOIs
Publication statusPublished - 1995
MoE publication typeA1 Journal article-refereed

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ions
magnetic pumping
Landau damping
cyclotron frequency
transit time
minorities
cyclotrons
electrons
damping
harmonics
causes

Cite this

Alava, Mikko ; Heikkinen, Jukka ; Hellsten, Thorbjörn. / Investigation of the effect of alfvén resonance mode conversion on fast wave current drive in ITER. In: Nuclear Fusion. 1995 ; Vol. 35, No. 7. pp. 881-889.
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abstract = "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",
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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 journalArticleScientificpeer-review

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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

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PY - 1995

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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

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