Edge Turbulence Imaging During L-H Transitions in NSTX S.J. Zweben, R.J. Maqueda, T. Munsat, D. P. Stotler, T.M. Biewer, C.E. Bush, B. LeBlanc, R. Maingi,

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Presentation transcript:

Edge Turbulence Imaging During L-H Transitions in NSTX S.J. Zweben, R.J. Maqueda, T. Munsat, D. P. Stotler, T.M. Biewer, C.E. Bush, B. LeBlanc, R. Maingi, N. A. Crocker, W. A. Peebles, S. Kubota, X. V. Nguyen and the NSTX Team Question: Does edge turbulence during L-H transition show poloidal shear-induced decorrelation ? APS ‘04 - CO3.011

GPI Diagnostic in NSTX viewing area ≈ 25x25 cm spatial resolution ≈ 1-2 cm Views D  (or HeI) light from gas puff I  n o n e f(n e,T e ) Sees D  fluctuations only in range ~ 5 eV < T e < 50 eV View aligned along B field line to see 2-D structure  B gas manifold Viewport B field

Using 300-frame PSI-5 camera at 250,000 frames/sec Total time of movie = 300x4 µsec = 1.2 msec / 30 sec Images of GPI Data see: RF limiter shadow separatrix 24 cm

L-Mode Case B=3.0 kG P=2.7 MW NBI I=650 kA =3.3x10 13 cm -3

H-Mode Case B=4.5 kG P=0.9 MW NBI I=825 kA =1.9x10 13 cm -3

L-H Transition Case #1 B=4.4 kG P=2.8 MW NBI I=800 kA =1.9x10 13 cm -3

L-H Transition Case #2 B=3.0 kG P=2.0 MW NBI I=970 kA =2.7x10 13 cm -3

L-H Transition Case # 3 B=3.0 kGP=2.0 MW NBI I=780 kA =2.2x10 13 cm -3

Time Dependences Near Transition Fast D  in divertor Central GPI chord Inner GPI chord 30 GHz reflectometer (see Crocker JP1.022) # msec

Radial Profiles Near Transition GPI L-mode signal peaks at T e ≈ 11 eV, n e ≈ 3.6x10 12 cm -3 GPI H-mode signal peaks at T e ≈ 32 eV, n e ≈ 8.6x10 12 cm -3 T e (eV) n e (10 13 cm -3 ) # L-mode time H-mode time GPI (rel.) pedestal cm

Tentative Interpretation Transitions from L- to H-mode seem to occur without much change in the 2-D turbulence structure or the poloidal flow(quantitative analysis is in progress) This looks different from the usual L-H scenario, which is based on poloidal shearing of edge turbulence Assuming this is correct, possible explanations include: - transition dynamics are located farther in radially or elsewhere poloidally (e.g. near X-point) - transition dynamics occur over longer or shorter timescales than are visible here - transition is not caused by poloidal shearing

Monday afternoon: Edge turbulence - Grulke (CI2A.001 invited talk) NSTX edge probes - Boedo et al (CO3.010 talk) C-Mod edge turbulence - Veto et al (CP1.007 poster) Wednesday afternoon (NSTX posters): edge GPI - Maqueda et al (JP1.024) edge reflectometry - Crocker et al (JP1.022) edge fluctuations - Lee et al (JP1.023) divertor imaging - Roquemore (JP1.025) edge physics - Bush et al (JP1.026) Wednesday afternoon (C-MOd orals): C-Mod GPI - Terry et al (JO3.008 talk) Related contributions: