NSTX XP802 results - S.A. Sabbagh XP802: Active RWM stabilization system optimization and ITER support Goals  Alter active control configuration to achieve.

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Presentation transcript:

NSTX XP802 results - S.A. Sabbagh XP802: Active RWM stabilization system optimization and ITER support Goals  Alter active control configuration to achieve highly reliable RWM stabilization at various plasma rotation,   Upper/lower RWM B r, B p sensors, follow from best CY2007 feedback settings B r sensor feedback provides RFA correction, B p provide RWM stabilization Determine if stable, low   <   i operation exists with feedback turned off If achieved, control system open as a tool for all NSTX XPs as desired  Specific ITER support requests Study effect of applied time delay on feedback (requires control system time delay capability) Determine impact of a large toroidal gap on active RWM stabilization to simulate ITER port plug coil geometry (take out one of six control coils) Addresses  Joule milestone, ITER Organization (IO) request, NSTX PAC request  ITPA experiment MDC-2 Progress 4/11/08

NSTX XP802 results - S.A. Sabbagh Initial RWM signature leads to rotating global kink Transition to global kink indicates that mode is an RWM off 1 2 zoomed view 1 1  B p n=1 NN  B n=odd  B rmid n=1  B p n=1 NN  B n=odd  Bp n=1 RFA RFA reduced n = 1 feedback on

NSTX XP802 results - S.A. Sabbagh USXR shows transition from RWM to global kink Initial RWM locked signature spins up, amplitude dies away K. Tritz edge core 1

NSTX XP802 results - S.A. Sabbagh Tearing mode appears significantly after global kink Significantly different than DIII-D results (H. Reimerdes) K. Tritz edge core edge core RWM + 20 ms+ 30 ms + 40 ms + 50 ms

NSTX XP802 results - S.A. Sabbagh Terminating event appears to be an internal kink n = 1 LMD shows mode lock (RWM?) preceding/concurrent w/kink Internal kink precedes H-L back-transition 2 K. Tritz edge core Zoomed in view

NSTX XP802 results - S.A. Sabbagh n = 1 feedback / RWM results show stabilization detail General conclusions (so far)  n = 1 feedback system has produced far greater reliability of discharge avoiding RWM Statistics being compiled  n = 1 feedback system does not insure stability against RWM Reasons for failure being analyzed (e.g. fast mode growth)  Mode characteristics appear to be RWM, not tearing Unlike present observation/conclusion by DIII-D Mode spin up, converts to global kink mode initially, tearing appears later Feedback system might be easing transition to rotating kink by altering boundary condition  Results to date question the validity of a “critical rotation” for RWM Next Steps  Analysis of XP830 RWM Stabilization Physics (Berkery), and related analysis to test kinetic stabilization model producing “bands” of stability/instability in rotation, beta