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SUMMARY:Summary results from DIII-D NTM control and snowflake divertor exp
 eriments are presented
DTSTART:20130124T150000
DTEND:20130124T160000
DTSTAMP:20260510T202451Z
UID:ced96665d37f014abe2f5bb9d3ef128084ed1dc74ac3db649f80ed2e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. E. Kolemen\nReal time steerable electron cyclotron current
  drive (ECCD) has been demonstrated to reduce the power requirements and t
 ime needed to remove 3/2 and 2/1 neoclassical tearing modes (NTM) in the D
 III-D tokamak. In a world-first demonstration of the techniques required i
 n ITER\, the island formation onset is detected automatically\, gyrotrons 
 are turned on\, and the real-time steerable ECCD launcher mirrors are move
 d promptly to drive current at the location of the islands to shrink and s
 uppress the modes well before saturation using real-time motional Stark ef
 fect (MSE) constrained equilibria reconstruction with advanced feedback an
 d search algorithms. This method reduces the ECCD energy requirement and s
 o raises Q by keeping the EC system off when the NTM is not present. Furth
 er\, in the experiments with accurate tracking of pre-emptive ECCD to reso
 nant surfaces\, both 3/2 and 2/1 modes are prevented from appearing with u
 p to five times less ECCD power.\nRecent DIII-D results using the snowflak
 e divertor configuration show significantly reduced (a) inter-ELM peak hea
 t flux and (b) energy loss per ELM without pedestal pressure reduction as 
 predicted theoretically. This supports the snowflake configuration as a pr
 omising solution for divertor heat load mitigation in present and future h
 igh-power magnetic confinement devices.
LOCATION:PPB 019
STATUS:CONFIRMED
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