CRPP-EPFL, Av.des Bains 21, CH-1007 Lausanne
* JET Joint Undertaking
& FOM Institute for Plasma Physics, Tijnhuizen, Niewegein, Netherlands
A new class of weakly damped Alfvén eigenmodes, the Kinetic Alfvén Eigenmodes predicted in theoretical models which include finite Larmor radius and finite parallel electric field effects, has been identified experimentally for the first time in JET tokamak plasmas. Multiple peak structures in the TAE frequency region have been excited and detected by means of a dedicated diagnostic in deuterium plasmas heated by cyclotron resonance heating, neutral beam injection, lower hybrid heating and high plasma current ohmic heating.
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