Radial Localization of Toroidicity-Induced Alfvén Eigenmodes

Wang, Zhixuan; Lin, Zhihong; Holod, Ihor; Heidbrink, W. W.; Tobias, Benjamin; Van Zeeland, Michael; Austin, M. E.

doi:10.1103/physrevlett.111.145003

Radial Localization of Toroidicity-Induced Alfvén Eigenmodes

Journal Article · Wed Oct 02 04:00:00 EDT 2013 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.111.145003· OSTI ID:1565214

Wang, Zhixuan ^[1]; Lin, Zhihong ^[1]; Holod, Ihor ^[1]; Heidbrink, W. W. ^[1]; Tobias, Benjamin ^[2]; Van Zeeland, Michael ^[3]; Austin, M. E. ^[4]

Univ. of California, Irvine, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)
Univ. of Texas, Austin, TX (United States)

Linear gyrokinetic simulation of fusion plasmas finds a radial localization of the toroidal Alfvén eigenmodes (TAEs) due to the nonperturbative energetic particle (EP) contribution. The EP-driven TAE has a radial mode width much smaller than that predicted by the magnetohydrodynamic theory. The TAE radial position stays around the strongest EP pressure gradients when the EP profile evolves. The nonperturbative EP contribution is also the main cause for the breaking of the radial symmetry of the ballooning mode structure and for the dependence of the TAE frequency on the toroidal mode number. These phenomena are beyond the picture of the conventional magnetohydrodynamic theory.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science; USDOE

OSTI ID:: 1565214

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 14 Vol. 111; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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