Recent experimental results for ICRF heating in PLT are presented. For the two-ion regime in D-H or 3 3 D-He plasmas minority H and He ions are found to absorb the rf power and transfer it to the deuterons and electrons in accordance with Fokker-Planck theory.
IntroductionDuring neutral beam injection (NBI) in the National Spherical Torus Experiment (NSTX), a wide variety of fast ion driven instabilities is excited by the large ratio of fast ion velocity to Alfvén velocity, together with the relatively high fast ion beta, b f . The fast ion instabilities have frequencies ranging from a few kilohertz to the ion cyclotron frequency. The modes can be divided roughly into three categories, starting with Energetic Particle Modes (EPM) in the lowest frequency range (0 to 120 kHz), the Toroidal Alfvén Eigenmodes (TAE) in the intermediate frequency range (50 to 200 kHz) and the Compressional and Global Alfvén Eigenmodes (CAE and GAE, respectively) from ≈300 kHz up to the ion cyclotron frequency. Each of these categories of modes exhibits a wide range of behavior, including quasi-continuous oscillation, bursting, chirping and, except for the lower frequency range, turbulence. Some examples of the range of EPM and TAE activity can be seen in Figs. 1a -1c.
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