flows, turbulence, and the edge plasma in nstx c.e. bush, s. zweben, r. maqueda, w. davis, d....
TRANSCRIPT
![Page 1: Flows, Turbulence, and the Edge Plasma in NSTX C.E. Bush, S. Zweben, R. Maqueda, W. Davis, D. Johnson, R. Kaita, H. Kugel, L. Roquemore, G. Wurden and](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649edc5503460f94bed569/html5/thumbnails/1.jpg)
Flows, Turbulence, and the Edge Plasma in NSTXC.E. Bush, S. Zweben, R. Maqueda, W. Davis, D. Johnson, R. Kaita,
H. Kugel, L. Roquemore, G. Wurden and the NSTX Team
NSTX 2004 Results Review, Sept. 20-21
• XP442 - Scoping Study of Ohmic H-modes• Fast Cameras - Flows, turbulence, and phenomena• Tile Langmuir Probes
![Page 2: Flows, Turbulence, and the Edge Plasma in NSTX C.E. Bush, S. Zweben, R. Maqueda, W. Davis, D. Johnson, R. Kaita, H. Kugel, L. Roquemore, G. Wurden and](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649edc5503460f94bed569/html5/thumbnails/2.jpg)
C.Bush, Results/Forum 2004
Page 2
Motivation
• Ohmic H-modes have low centrally peaked densities– Explore edge and core turbulence simultaneously– Target plasma for early NBI and combined ITB and ETB
NBI OHELM-Free
OHELMy
![Page 3: Flows, Turbulence, and the Edge Plasma in NSTX C.E. Bush, S. Zweben, R. Maqueda, W. Davis, D. Johnson, R. Kaita, H. Kugel, L. Roquemore, G. Wurden and](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649edc5503460f94bed569/html5/thumbnails/3.jpg)
C.Bush, Results/Forum 2004
Page 3
Goals
• Scoping study in parameter/configuration space
• Measure turbulence in core and edge of H-mode simultaneously
• Assess use as Target Plasma
![Page 4: Flows, Turbulence, and the Edge Plasma in NSTX C.E. Bush, S. Zweben, R. Maqueda, W. Davis, D. Johnson, R. Kaita, H. Kugel, L. Roquemore, G. Wurden and](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649edc5503460f94bed569/html5/thumbnails/4.jpg)
C.Bush, Results/Forum 2004
Page 4
Results for Ohmic H-mode Scoping Study
• One-half run day – mini-scans in Bt and Ip
– Some OH-H-modes randomly on other days
• H-modes at 600 to 900 kA, 3.0 to 4.5 kG TF
– Short H-mode at Ip = 600 kA, Bt = 3 kG
• OH H-modes obtained for 1st time ever on NSTX during this run
– Most readily obtained after hot boronization
– Alternating helium conditioning shots seem to help
– Obtained both double null (DN) and lower single null (LSN) divertor
– Most short duration, some with ELMs and some ELM-free
• Peaked Central ne
– ELMy: Small high frequency ELMs (?) keep ears from developing
– ELM-free: have ears, but edge peak lower than central ne
• No turbulence measurements made in core of OH H-mode
• Some edge reflectometer fluctuation data; Some GPI data, not L-H
![Page 5: Flows, Turbulence, and the Edge Plasma in NSTX C.E. Bush, S. Zweben, R. Maqueda, W. Davis, D. Johnson, R. Kaita, H. Kugel, L. Roquemore, G. Wurden and](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649edc5503460f94bed569/html5/thumbnails/5.jpg)
C.Bush, Results/Forum 2004
Page 5
PLOSS for NBI and OH Hmodes
![Page 6: Flows, Turbulence, and the Edge Plasma in NSTX C.E. Bush, S. Zweben, R. Maqueda, W. Davis, D. Johnson, R. Kaita, H. Kugel, L. Roquemore, G. Wurden and](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649edc5503460f94bed569/html5/thumbnails/6.jpg)
C.Bush, Results/Forum 2004
Page 6
Edge measurements (ERD) in Ohmic H-modes show Er and Vp change prior to L-H transition
Er and Vp begin to
change 10 to 20
ms before L-H
transition (here at
t ~ 0.220 sec)
H-mode
Shot 113350
Time (s)
Vp (km/s)
VT (km/s)
Er (kV/m)
Ip (MA)
0.16 0.20 0.24 0.28
1.00.8
0.4
0.0-0.5
-1.0
-10
5
0
-5
-1.5
-2.0
-2.5
-1550
-10
-15
-5
![Page 7: Flows, Turbulence, and the Edge Plasma in NSTX C.E. Bush, S. Zweben, R. Maqueda, W. Davis, D. Johnson, R. Kaita, H. Kugel, L. Roquemore, G. Wurden and](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649edc5503460f94bed569/html5/thumbnails/7.jpg)
C.Bush, Results/Forum 2004
Page 7
Highest Normalized Shot: Perturbed
by an External Kink Mode: (CIII filter) Shot 114463
![Page 8: Flows, Turbulence, and the Edge Plasma in NSTX C.E. Bush, S. Zweben, R. Maqueda, W. Davis, D. Johnson, R. Kaita, H. Kugel, L. Roquemore, G. Wurden and](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649edc5503460f94bed569/html5/thumbnails/8.jpg)
C.Bush, Results/Forum 2004
Page 8
H-mode Showing Quiescent External Kink Small Torus at EOS: (CIII filter)
Shot 114151
![Page 9: Flows, Turbulence, and the Edge Plasma in NSTX C.E. Bush, S. Zweben, R. Maqueda, W. Davis, D. Johnson, R. Kaita, H. Kugel, L. Roquemore, G. Wurden and](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649edc5503460f94bed569/html5/thumbnails/9.jpg)
C.Bush, Results/Forum 2004
Page 9
#113484 @ 4 µsec/frame (D light)
Medium ELM Images #2
![Page 10: Flows, Turbulence, and the Edge Plasma in NSTX C.E. Bush, S. Zweben, R. Maqueda, W. Davis, D. Johnson, R. Kaita, H. Kugel, L. Roquemore, G. Wurden and](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649edc5503460f94bed569/html5/thumbnails/10.jpg)
C.Bush, Results/Forum 2004
Page 10
Activity Near Inner Wall During and Following an ELM (157-175 ms)
Shot 113862
Magnetic field lineplot from EFIT
![Page 11: Flows, Turbulence, and the Edge Plasma in NSTX C.E. Bush, S. Zweben, R. Maqueda, W. Davis, D. Johnson, R. Kaita, H. Kugel, L. Roquemore, G. Wurden and](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649edc5503460f94bed569/html5/thumbnails/11.jpg)
C.Bush, Results/Forum 2004
Page 11
Langmuir Probes
• Flush mounted single probes
• Total of 22 probes, 6 top and 6
bottom divertors
– Remainder along centerstack
• Have data for vast majority of shots
• Virtually no signal from centerstack
probes when plasma is diverted
• Some Isat, Te, ne data in Tree soon• Tile Langmuir
Probes
![Page 12: Flows, Turbulence, and the Edge Plasma in NSTX C.E. Bush, S. Zweben, R. Maqueda, W. Davis, D. Johnson, R. Kaita, H. Kugel, L. Roquemore, G. Wurden and](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649edc5503460f94bed569/html5/thumbnails/12.jpg)
C.Bush, Results/Forum 2004
Page 12
Future Plans
• Continue XP442– Get core turbulence data– Finish scoping studies
• Fast camera studies– Add filters – CI, LiII, Neon– Correct fisheye distortion
• Langmuir Probes– Get data in tree– Additional probes (?)
![Page 13: Flows, Turbulence, and the Edge Plasma in NSTX C.E. Bush, S. Zweben, R. Maqueda, W. Davis, D. Johnson, R. Kaita, H. Kugel, L. Roquemore, G. Wurden and](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649edc5503460f94bed569/html5/thumbnails/13.jpg)
Backup Slides
Extras
![Page 14: Flows, Turbulence, and the Edge Plasma in NSTX C.E. Bush, S. Zweben, R. Maqueda, W. Davis, D. Johnson, R. Kaita, H. Kugel, L. Roquemore, G. Wurden and](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649edc5503460f94bed569/html5/thumbnails/14.jpg)
C.Bush, Results/Forum 2004
Page 14
Ion Saturation Current vs. Time
0.12
0.08
0.04
0.000.00 0.10 0.20 0.30 0.40
0.08
0.04
0.00
0.00 0.10 0.20 0.30 0.40
112830, Smoothed over 2 sweeps
Raw isat data
I sa
tI s
at
Time [s]
Time [s]
![Page 15: Flows, Turbulence, and the Edge Plasma in NSTX C.E. Bush, S. Zweben, R. Maqueda, W. Davis, D. Johnson, R. Kaita, H. Kugel, L. Roquemore, G. Wurden and](https://reader036.vdocuments.site/reader036/viewer/2022062517/56649edc5503460f94bed569/html5/thumbnails/15.jpg)
C.Bush, Results/Forum 2004
Page 15
Activity Near Inner Wall During an ELM (160 ms)
Shot 113862
From EFIT