Analysis of Alpha-driven TAE Modes in the TFTR DT Experiments

Details Analysis of Alpha-driven TAE Modes in the TFTR DT Experiments Analysis of Alpha-driven TAE Modes in the TFTR DT Experiments

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..dpphtp412c&link_type=abstract

American Physical Society, Division of Plasma Physics Meeting, November 17-21, 1997, abstract #hTupP412.

Physics

Plasma Physics

Scientific paper

footnotetext[1]This work is supported by US DoE contract DE-AC02-76-CHO-3073 The alpha-driven TAE modes in the TFTR DT experiments are analyzed using the recently improved NOVA-K code. The NOVA-K code computes perturbatively the TAE mode structure, the fast ion drive, various dampings due to core plasma kinetic effects, such as ion/electron Landau damping, electron's collisional damping, and radiative damping. The effects of finite drift orbit width and Larmor radius of fast particles are also included. The numerical results of mode structure, mode frequency and critical alpha beta are compared with the experiments in details. The calculated mode frequencies agree well with the measurements, typically to within 5%. The computed mode radial localization and stability threshold are also consistent with the observations. The stability thresholds are found to be sensitive to plasma profiles and are strongly dependent on central q profile. Based on the NOVA-K linear analysis (growth and damping rates of each species) and a nonlinear theory of TAE instabilities near threshold, we will estimate the TAE mode saturation amplitude. The theoretical temporal behavior and saturation level of TAE amplitudes will be compared with TAE amplitudes measured by the reflectometers in TFTR.

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