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Nonlinear interaction between RF-heated high-energy ions and MHD-modes
KTH, Superseded Departments, Alfvén Laboratory.
KTH, Superseded Departments, Alfvén Laboratory.
KTH, Superseded Departments, Alfvén Laboratory.
2003 (English)In: RADIO FREQUENCY POWER IN PLASMAS / [ed] Forest C.B., 2003, Vol. 694, 459-462 p.Conference paper (Refereed)
Abstract [en]

Excitation of global Alfven eigenmodes by fast ions during ICRH is frequently observed in tokamaks. The importance of the phasing of the ICRH antennae for the excitation of these modes have been seen in experiments. The Alfven eigenmodes will drive the distribution function of the fast ions towards a state where the gradient in phase space is reduced. In general, the fast ions are displaced outwards, which can have a significant effect on the ICRH power deposition and lead to reduced heating efficiency. To calculate the effect on the heating profiles by the excitation of Alfven eigenmodes and the, effect on the resonating ions the Monte Carlo code FIDO, used for ICRH, has been upgraded to include particle interactions with MHD-waves. This allows self-consistent calculations of the mode amplitude and the distribution function during RF heating.

Place, publisher, year, edition, pages
2003. Vol. 694, 459-462 p.
Keyword [en]
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-25642ISI: 000188894000087ISBN: 0-7354-0158-6OAI: diva2:359334
15th Topical Conference on Radio Frequency Power in Plasmas MORAN, WY, MAY 19-21, 2003
QC 20101027Available from: 2010-10-27 Created: 2010-10-27 Last updated: 2010-10-27Bibliographically approved

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Bergkvist, TommyHellsten, TorbjörnLaxåback, Martin
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