Sassenberg, K;Maraschek, M;McCarthy, PJ;Bobkov, W;Garcia-Munoz, M;Hicks, N;Igochine, V;Lauber, P;Gunter, S

2010

May

Nuclear Fusion

ICRH beatwave excited toroidicity induced Alfven eigenmodes in ASDEX Upgrade

Published

WOS: 5 ()

TOROIDAL PLASMAS MHD EXCITATION TOKAMAK

50

5

052003

Experimental evidence is presented demonstrating that an ion cyclotron resonance heating (ICRH) beatwave can drive toroidicity induced Alfven eigenmodes (TAEs) to a finite amplitude and also increase the amplitude of TAEs already excited by fast ions. The radial structure of a beatwave driven TAE reconstructed from soft x-ray measurements is shown to agree with simulations from the gyro-kinetic code LIGKA. Thus beatwaves provide the means to excite TAEs which can be used to diagnose the plasma's safety factor profile through MHD-spectroscopic techniques without significantly perturbing the plasma or to influence the stability of existing TAEs allowing their effect on the fast ion population to be studied.

VIENNA

0029-5515

10.1088/0029-5515/50/5/052003