Session GO4: DIII-D Tokamak

9:30 AM–12:30 PM, Tuesday, November 15, 2011
Room: Ballroom E

Chair: David Pace, ORISE

Abstract ID: BAPS.2011.DPP.GO4.5

Abstract: GO4.00005 : Testing Pedestal Models for Joint Research Target on DIII-D

10:18 AM–10:30 AM

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Authors:

R.J. Groebner
P.B. Snyder
T.H. Osborne
S.P. Smith
A.W. Leonard
B.D. Bray
T.M. Deterly
C. Liu
R.L. Boivin
J.S. deGrassie
R. Prater
(General Atomics)

D. Eldon
(UCSD)

T.L. Rhodes
L. Zeng
J.C. Hillesheim
(UCLA)

Z. Yan
G.R. McKee
As part of the FY2011 DOE Joint Research Target on Pedestal Physics, tests are being performed on DIII-D for gyrokinetic modes that have been proposed as physics mechanisms for controlling the H-mode pedestal structure. These modes include kinetic ballooning modes (KBM), candidates for limiting the total pedestal pressure gradient, ion temperature gradient modes (ITGM), candidates for limiting the $T_i$ gradient at the pedestal top and electron temperature gradient modes (ETGM), candidates for limiting the $T_e$ gradient both in the pedestal and on top of the pedestal. The theoretical control parameters for these modes are $\alpha_{MHD}$ for KBM, $\eta_e$ for ETGM and $\eta_i$ for ITGM. Experiments are being performed in DIII-D to determine if measured values of these parameters are close to the theoretical threshold values for the linear onset of these modes.