Non-linear study of fast particle excitation of global Alfvén eigenmodes during ICRH
2005 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 45, 485-493 p.Article in journal (Refereed) Published
High-power ion–cyclotron resonance heating (ICRH) can produce centrally peaked fast ion distributions with wide non-standard drift orbits exciting Alfvén eigenmodes (AEs). The dynamics of the AE excitation depends not only on the anisotropy and the peaking of the fast ion distribution but also on the decorrelation of the AE interactions and the renewal of the fast ions resonant with the AE by ion–cyclotron interactions. A method of self-consistently including the evolution of the distribution function of fast ions during excitation of AEs and ICRH has been developed and implemented in the SELFO code. Numerical simulations of the AE dynamics and ICRH give a variation of the AE amplitude consistent with the experimentally observed splitting of the mode frequency. The experimentally observed fast damping of the mode as the ICRH is switched off is also evident in the simulations.
Place, publisher, year, edition, pages
2005. Vol. 45, 485-493 p.
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-6935DOI: 10.1088/0029-5515/45/6/010ISI: 000230409800010ScopusID: 2-s2.0-19944380153OAI: oai:DiVA.org:kth-6935DiVA: diva2:11788
QC 201006282007-03-292007-03-292013-03-21Bibliographically approved