Existence of Weakly Damped Kinetic Alfven Eigenmodes in Reversed Shear Tokamak
A kinetic theory of weakly damped Alfven Eigenmode (AE) solutions strongly interacting with the continuum is developed for tokamak plasmas with reversed magnetic shear. We show that the ideal MHD model is not sufficient for the eigenmode solutions if the standard causality condition bypass rule is applied. Finite Larmor radius effects are required, which introduce multiple kinetic subeigenmodes and collisionless radiative damping. The theory explains the existence of experimentally observed Alfvenic instabilities with frequencies sweeping down and reaching their minimum (bottom).
- Research Organization:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ
- Sponsoring Organization:
- USDOE Office of Science (SC)
- OSTI ID:
- 953698
- Report Number(s):
- PPPL-4340
- Country of Publication:
- United States
- Language:
- English
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