Measurement of the Damping Rate of High-n Toroidal Alfven Eigenmodes in JET

A new set of compact in-vessel antennas has been built and installed in JET to provide for the first time the direct measurement of the damping rate (/) of stable Alfvén Eigenmodes (AEs) with toroidal mode number (n) in the range n=3-15. This paper reports the first quantitative analysis of the measurements of the damping rate for these modes as function of the edge plasma elongation (95). We find that the scaling of / vs. 95 for medium-n Toroidal AEs, with n=3-7, follows the same trend previously measured and explained theoretically for the n=1 and n=2 modes. This confirms the possibility of using the edge shape parameters as a real-time actuator for control of the stability of alpha-particles driven AEs in burning plasma experiments, such as ITER.


Published in:
Proceedings 11th IAEA Technical Committee Meeting on Energetic Particles
Presented at:
11th IAEA Technical Committee Meeting on Energetic Particles, Kyiv (Ukraine), 21-23 September 2009
Keywords:
Laboratories:
SPC
CRPP




 Record created 2010-01-12, last modified 2018-01-28

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