T. Biewer, Sep. 21 st, 2004 NSTX Results Review 20041 of 11 Dependence of Edge Flow on Magnetic Configuration in NSTX T.M. Biewer, R.E. Bell, D. Gates,

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T. Biewer, Sep. 21 st, 2004 NSTX Results Review of 11 Dependence of Edge Flow on Magnetic Configuration in NSTX T.M. Biewer, R.E. Bell, D. Gates, M. Greenwald, B. LaBombard, E. Marmar, M. Peng, J. Rice, G. Schilling, J. Terry, R. Wilson, S. Zweben Work in Progress. XP447 successfully executed, with mixed results: Careful configuration control (dR sep ) from rtEFIT. Edge flow varies with magnetic configuration. Core & GPI flow data pending. But, effect on H-mode power threshold undocumented due to failure to achieve H-mode except in DND configuration.

T. Biewer, Sep. 21 st, 2004 NSTX Results Review of 11 Motivation Recent results from Alcator C-Mod indicate that the plasma flow directions in the SOL changes direction as the magnetic configuration varies from USN to DND to LSN in ICRF heated plasmas. Change in the core rotation is also coincident with the SOL flow change. Flow directions account for the L-H power threshold difference in USN v. LSN in C-Mod. Similar experiments attempted in NSTX (XP447): –Use rtEFIT to control the plasma shape as dR sep is smoothly varied in Ohmic and HHFW heated plasmas. –The ERD provided poloidal and toroidal measurements of flow in the edge and SOL. –CHERS gave profiles of rotation from edge to core.

T. Biewer, Sep. 21 st, 2004 NSTX Results Review of 11 Results from C-Mod

T. Biewer, Sep. 21 st, 2004 NSTX Results Review of 11 C-Mod flow explanation

T. Biewer, Sep. 21 st, 2004 NSTX Results Review of 11 Run Plan Establish target plasma: (113040) DND, D 2 fueled, rtEFIT controlled, 600 kA, 0.42 T, n e ~4x10 19 m -3, gap in ~4-6 cm, gap out ~4 cm, outboard midplane fueled. Flattop from t= ms, at t=300 ms apply 2 MW of HHFW at 14 m -1, at t= and blip NBI source C (75 kV) for CHERS. dR sep =0, 2 shots Scan dR sep –dR sep =-2 cm, 2 shots –dR sep =+2 cm, 2 shots –dRsep=+1 cm, 2 shots –dRsep=+0.5 cm, 2 shots –dRsep=-0.5cm, 2 shots –dRsep=-1 cm, 2shots Monitor presence of H-mode in the dR sep scan –Take shots at lower or higher RF to search for power threshold in particular configurations.

T. Biewer, Sep. 21 st, 2004 NSTX Results Review of 11 Representative discharge DND, dR sep =0 D 2 fueled –outboard midplane rtEFIT controlled I p ~600 kA B T ~ 0.42 T n e ~3x10 19 m -3 gap in ~4-6 cm gap out ~4 cm Flattop from t= ms or greater at t=200 ms apply 2 MW of HHFW at 14 m ms blip NBI source C (75 kV) every 100 ms for CHERS

T. Biewer, Sep. 21 st, 2004 NSTX Results Review of 11 rtEFIT was extremely useful. Started with a DND plasma. Used rtEFIT shape control to transistion into USN or LSN. Excellent control of the plasma. D. Gates

T. Biewer, Sep. 21 st, 2004 NSTX Results Review of 11 NSTX configuration scan USN, dR sep ~+2 cmDND, dR sep ~0 cmLSN, dR sep ~-2 cm

T. Biewer, Sep. 21 st, 2004 NSTX Results Review of 11 Toroidal flow variation C-Mod results NSTX results LSN USN Blue points are during H-mode

T. Biewer, Sep. 21 st, 2004 NSTX Results Review of 11 H-mode access elusive except in DND Plasma transitioned into H- mode readily in DND at P RF ~1.5 MW. However transition could not be induced in LSN or USN. Scanning dR sep within a shot (thanks to rtEFIT) shows H- mode transition only near dR sep ~0, i.e. DND.

T. Biewer, Sep. 21 st, 2004 NSTX Results Review of 11 Summary rtEFIT has proven to be a very useful tool in plasma shape control. Edge flow in NSTX appears to have similar dependence on magnetic configuration as C-Mod. Planned Analysis –Thorough analysis of ERD measured edge flows. –Comparison of CHERS measured core flows. –Velocity field calculations of GPI flows. Future Work –Develop understanding of H-mode access limitations in LSN and USN configurations. –Examine L-H power threshold as function of edge/SOL flows (i.e. variation with magnetic configuration).

T. Biewer, Sep. 21 st, 2004 NSTX Results Review of 11 Parallel flow variation.