Supported by Office of Science NSTX K. Tritz, S. Kaye PPPL 2009 NSTX Research Forum PPPL, Princeton University Dec. 8-10, 2008 Transport and Turbulence 2009 Research Priorities and Recommended XPs Culham Sci Ctr U St. Andrews York U Chubu U Fukui U Hiroshima U Hyogo U Kyoto U Kyushu U Kyushu Tokai U NIFS Niigata U U Tokyo JAEA Hebrew U Ioffe Inst RRC Kurchatov Inst TRINITI KBSI KAIST POSTECH ASIPP ENEA, Frascati CEA, Cadarache IPP, Jülich IPP, Garching ASCR, Czech Rep U Quebec College W&M Colorado Sch Mines Columbia U Comp-X General Atomics INEL Johns Hopkins U LANL LLNL Lodestar MIT Nova Photonics New York U Old Dominion U ORNL PPPL PSI Princeton U SNL Think Tank, Inc. UC Davis UC Irvine UCLA UCSD U Colorado U Maryland U Rochester U Washington U Wisconsin

NSTX NSTX Research ForumDec. 8-10, / Research Areas Investigate the mechanisms governing electron transport L-H transition physics Study relationship between particle/impurity transport and momentum pinch Beta scaling of confinement using dimensionless parameter scans in ELMy/ELM-free discharges Aspect ratio dependence of confinement scaling

NSTX NSTX Research ForumDec. 8-10, /13 Possible T&T ITPA Joint Experiments –TC-1: Confinement scaling in ELMy H-modes: beta degradation –TC-2: Hysteresis and access to H-mode with H~1 –TC-4: Species dependence of L-H threshold –TC-6: Transport dependence of high performance ops on ExB shear and external momentum input –TC-9: Scaling of intrinsic rotation with no momentum input –TC-10: Exptl ID of ITG/TEM/ETG turb and comparison to codes –TC-11: He transport in hybrid, AT, ITB, etc. scenarios –TC-12: H-mode transport in low aspect ratio –TC-15: Dependence of momentum and particle pinch on collisionality

NSTX NSTX Research ForumDec. 8-10, /13 Statistics 17 experimental run days requested (15 XPs) Guidance 6+2 (+ 2 ITER) Combinations possible within group; shared run time with other TSGs

NSTX NSTX Research ForumDec. 8-10, /13 XP Proposals L-H threshold studies –Kaye: He/D comparison (including confinement quality), effect of rotation, I p (B T ) scaling –Solomon: effect of rotation, hysteresis (density and rotation) –Maingi: Dependence of threshold on X-point radial location Electron transport –Tritz: GAE investigation – characterize dependence of transport on mode structure, amplitude, frequency (high-k, FIRETIP) –Delgado-Aparicio: Particle transport dependence on beam power –Wong: Search for microtearing modes (new X-ray spectrometer, SXR to measure effect on electron distribution)

NSTX NSTX Research ForumDec. 8-10, /13 XP Proposals (cont’d) Core transport –Kaye: Beta scaling of confinement (Li to suppress ELMs in weakly- shaped plasmas) –M. Bell: Investigate transport and turbulence in negative  plasmas –Lee: Density fluctuations and impact of turbulence on confinement –Yuh: Sustained L-mode ITBs; couple to ETB (double barrier) –McKee: BES XMP (after summer run) Rotation studies –Solomon: Effect of collisionality on momentum and particle pinch (test of TEM theory) –Burrell: DIII-D/NSTX joint experiment on poloidal rotation (test of neoclassical theory and poloidal rotation damping)

NSTX NSTX Research ForumDec. 8-10, /13 Runtime Allocation KayeBeta degradation of confinement in weakly shaped plasmas 0.5 Kaye/SolomonL-H threshold studies (2 ITER) 1 MaingiDependence of the L-H power threshold on X-point radius 1 SolomonDependence of momentum and particle pinch on collisionality 1 TritzCharacterization of GAE modes and their 1 (+ 1 from WPI) effect on electron thermal transport M. BellInvestigation of transport and turbulence in negative-triangularity plasmas R. Bell/BurrellComparison of impurity poloidal velocity on NSTX and D III-D 1 YuhSustained ITBs / H-Mode ITBs 0.5 (+1 from ASC)1 WongSearch for evidence of microtearing modes in NSTX Lee Density fluctuation measurement for diffusion coefficient piggyback in conjunction with Gyro-Center Shift (GCS) DelgadoParticle transport dependence on beam power piggyback on Tritz SolomonInvestigation of neoclassical offset rotation associated with NTV Macro, needs ctr-injection McKeeBES shakedown after summer opening ` Total 68.5

NSTX NSTX Research ForumDec. 8-10, /13 Disposition of Joint Experiments –TC-1: Confinement scaling in ELMy H-modes: beta degradation –TC-2: Hysteresis and access to H-mode with H~1 –TC-4: Species dependence of L-H threshold –TC-6: Transport dependence of high performance ops on ExB shear and external momentum input –TC-9: Scaling of intrinsic rotation with no momentum input In WPI –TC-10: Exptl ID of ITG/TEM/ETG turb and comparison to codes –TC-11: He transport in hybrid, AT, ITB, etc. scenarios –TC-12: H-mode transport in low aspect ratio –TC-15: Dependence of momentum and particle pinch on collisionality