V. A. Soukhanovskii Lawrence Livermore National Laboratory H. W. Kugel, R. Kaita, A. L. Roquemore Princeton Plasma Physics Laboratory NSTX Research Team.

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Presentation transcript:

V. A. Soukhanovskii Lawrence Livermore National Laboratory H. W. Kugel, R. Kaita, A. L. Roquemore Princeton Plasma Physics Laboratory NSTX Research Team NSTX FY’04 Results Review September 2004 Princeton, NJ First results from NSTX supersonic gas jet fueling experiments

V. A. Soukhanovskii, NSTX Results Review Acknowledgements R. Bell, T. Biewer, W. Blanchard, D. Gates, R. Gernhardt, G. Gettelfinger, T. Gray, L. Guttadora, D. LaBrie, R. Majeski, M. Ono, T. Provost, P. Sichta, D. Stotler, J. Taylor, J. Timberlake (PPPL) A. J. Smits and S. Zaidi (Princeton University) N. Nishino (Hiroshima University, Japan) R. Raman (University of Washington) M. Frost (Kent State University) This research is supported by the U.S. Department of Energy under contracts No. W-7405-Eng-48 at LLNL and DE-AC02-76CH03073 at PPPL.

V. A. Soukhanovskii, NSTX Results Review Supersonic gas injector has become operational in FY’04

V. A. Soukhanovskii, NSTX Results Review Off-line pressure measurements confirm high Mach number and highly collimated gas jet shape Inner separatrix Outer strke point Jet divergence half-angle: 6 o - 25 o D 2 : M = 4, T ~ K,  ~ 5 x cm -3, Re = 6000 D 2 : v therm ~ 1100 m/s, v flow = 2400 m/s

V. A. Soukhanovskii, NSTX Results Review Flow rate is measured in situ on NSTX Flow rate (Torr l / s):   V NSTX  P /  t Future SGI may require P plenum > 2000 Torr NSTX gas injector flow rates: HFS: Torr l /s LFS: Torr l /s

V. A. Soukhanovskii, NSTX Results Review Experiments on NSTX XMP-35 “SGI commissioning” completed No exp. time was allocated for an XP Preliminary results are encouraging: higher fueling efficiency, high gas jet collimation (expect higher wall saturation limit), good SOL penetration, compatibility with H-mode edge Future work will aim at optimizing nozzles and studying the physics of supersonic gas jet fueling

V. A. Soukhanovskii, NSTX Results Review Supersonic gas jet penetrates well through a thick scrape-off layer Injection in the end of discharge into a 25 cm SOL with T e < 5 eV, n e < 5 x cm -3 plasma camera CHERS

V. A. Soukhanovskii, NSTX Results Review D 2 injections in 4-6 MW NBI heated plasmas (movies) Shot : 6  MW high  plasmas, injection at t=180 ms R SGI =1.604 m, Z SGI =0.198 m R sep = m Shot : 4  MW H-mode with type 1 ELMs, injection at t=300 ms R SGI =1.604 m, Z SGI =0.198 m R sep = m

V. A. Soukhanovskii, NSTX Results Review Localized cooling is evident from C I spectroscopy Background CHERS - R. Bell In SGI-fueled plasma bg-CHERS array measures localized C I emission characteristic of cool plasma edge Do not see in reference plasma Start of injection

V. A. Soukhanovskii, NSTX Results Review Compare two 6 MW NBI high-  pulses with and without supersonic gas injection Fueling efficiency  gas ~ 50 Torr l / s dN e /dt = 0.4 / = 16 T l / s  = Preliminary result - based on one shot Supersonic gas jet fueling efficiency  is 3-4 times higher than  of a conventional gas puff Note density difference

V. A. Soukhanovskii, NSTX Results Review DEGAS 2 neutral transport modeling consistent with general features of supersonic gas injection DEGAS 2 neutral transport model Conventional D 2 injection: T = 300 K Supersonic D 2 injector: T= 50 K, v flow = 2200 m/s Not self-consistent: fixed T e, n e, are used D 2 injected from a 5 mm nozzle Good starting point for experiment interpretation DEGAS 2 D. P. Stotler

V. A. Soukhanovskii, NSTX Results Review DEGAS 2 neutral transport modeling consistent with observed features of supersonic gas injection DEGAS 2 D. P. Stotler Molecular density Atomic density D  intensity

V. A. Soukhanovskii, NSTX Results Review Summary Supersonic gas injector proposed at FY’02 NSTX Research Forum (November 2001) First results reported at FY’04 Results Review Preliminary results are encouraging: higher fueling efficiency, high gas jet collimation (expect higher wall saturation limit), good SOL penetration, compatibility with H-mode edge Future work will aim at optimizing SGI and studying the physics of supersonic gas jet fueling, H-mode access and ELM control with SGI Potential for collaborations (MAST, others?)