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Scaling of impurity (Ne & Ar) transport in beam heated NSTX H-mode discharges

Scaling of impurity (Ne & Ar) transport in beam heated NSTX H-mode discharges. L. F. Delgado-Aparicio, D. Stutman, K. Tritz, and M. Finkenthal The Johns Hopkins University, The Plasma Spectroscopy Group R. E. Bell, R. Kaita, S. Kaye, B. P. LeBlanc, S. Paul, L. Roquemore and D. Smith

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Scaling of impurity (Ne & Ar) transport in beam heated NSTX H-mode discharges

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  1. Scaling of impurity (Ne & Ar) transport in beam heated NSTX H-mode discharges L. F. Delgado-Aparicio, D. Stutman, K. Tritz, and M. Finkenthal The Johns Hopkins University, The Plasma Spectroscopy Group R. E. Bell, R. Kaita, S. Kaye, B. P. LeBlanc, S. Paul, L. Roquemore and D. Smith Princeton Plasma Physics Laboratory F. Levinton, H. YuhNOVA Photonics, Inc. J. Lepson and P. Beiersdorfer University of California - Berkeley & Lawrence Livermore National Laboratory NSTX, XP 716, NSTX Physics meetingMonday, April 2, 2007 Princeton, New Jersey, USA

  2. Type of plasmas needed and problems encountered NSTX 121154, 121162, 4.5 kG, 1.0 MA NSTX 121154, 121162, 4.5 kG, 1.0 MA • NBI requirements • Sources A & B @ 90 kV, and source C @ 70 kV • Turn of source C @ 300 ms • Problems during XP 716 • Source B had to be turned off. Worked at 4 MW with sources A & C • Multiple ELMs and possible inboard MARFE activity • Try to reduce the ELM activity by changing the CS fueling • MHD activity in 5.5 kG shots • H-mode  L-mode  H-mode (change timings) • Impossible to achieve good conditions @ 0.8 MA  0.9 MA • Control access for TVPS PLC • Failed to open shutters (TIVs) for good Ar injection!

  3. Shot matrix for 1st half of the day (Neon injections) Ip scaling at Bf=5.5 kG Bf scaling at Ip=1.0 MA

  4. Neon injection at 5.5 kG and 1.0 MA (121017 & 121015) Neon, t[350,360]ms CORE MID-RADIUS EDGE

  5. Shot matrix for 2nd half of the day (Argon injections)

  6. Argon injection at 4.5 kG and 1.0 MA (121036 & 121035) Argon, t[400,410]ms CORE MID-RADIUS EDGE

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