PPT Slide

Stabilizing Kinks for ARIES-AT

• The high beta achieved in ARIES-AT is mainly based on the premise that external kinks

can be stabilized with close fitting conducting walls.

- When conductivity is finite, resistive wall modes need to be stabilized by

(1) Toroidal plasma rotation, or

(2) Active feedback coils.

• Toroidal rotation can be driven by

- Neutral beam injection: Ample experimental database; physics relatively

well understood; analysis tools exist.

- RF techniques : Observed rotation in RF heating experiments (e.g., TFTR,

JET, C-Mod); many proposed theories, all invoking wave-ion interactions, but none

at present can provide a self-consistent picture in explaining all observations.

NBI has stronger basis as rotation driver for ARIES-AT

Innovative RF rotation drive techniques need to be identified.

• So, there are two approaches for CD and kink stabilization:

- Off-axis CD with LH waves, and RWM stabilization with feedback coils.

- Off-axis CD and rotation drive using NBI

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