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S.A. Sabbagh, J.M. Bialek, S.P. Gerhardt, R.E. Bell, J.W. Berkery, B. LeBlanc, J.E. Menard, et al.

Supported by. Columbia U Comp-X General Atomics INEL Johns Hopkins U LANL LLNL Lodestar MIT Nova Photonics NYU ORNL PPPL PSI SNL UC Davis UC Irvine UCLA UCSD U Maryland U New Mexico U Rochester U Washington U Wisconsin Culham Sci Ctr Hiroshima U HIST Kyushu Tokai U

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S.A. Sabbagh, J.M. Bialek, S.P. Gerhardt, R.E. Bell, J.W. Berkery, B. LeBlanc, J.E. Menard, et al.

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  1. Supported by Columbia U Comp-X General Atomics INEL Johns Hopkins U LANL LLNL Lodestar MIT Nova Photonics NYU ORNL PPPL PSI SNL UC Davis UC Irvine UCLA UCSD U Maryland U New Mexico U Rochester U Washington U Wisconsin Culham Sci Ctr Hiroshima U HIST Kyushu Tokai U Niigata U Tsukuba U U Tokyo JAERI Ioffe Inst TRINITI KBSI KAIST ENEA, Frascati CEA, Cadarache IPP, Jülich IPP, Garching U Quebec XP1023:Optimized RWM control for high <bN>pulseat low collisionality and li S.A. Sabbagh, J.M. Bialek, S.P. Gerhardt, R.E. Bell, J.W. Berkery, B. LeBlanc, J.E. Menard, et al. Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, USA Princeton Plasma Physics Laboratory NSTX Physics Meeting August 9th, 2010 Princeton Plasma Physics Laboratory V3.0

  2. XP1023:Optimized RWM feedback control for high <bN>pulseat low collisionality and li • Summary (8/3/10 run) • Total of 8 shot (1.5 hours) – all useful • Generated long-pulse, reduced li target plasmas, filling out n = 1 RWM feedback parameter scans before the LLD fill • Progress • Addressed several key outstanding question froms last run of Xp1023 • Optimal n = 1 RWM control settings have apparently changed significantly • Changed settings apparently not due to new RWM sensor compensations afforded by new “MIU” algorithm • Best plasmas run with combination of n = 1 Bp and Br RWM sensor feedback • Important to perform RWM control parameter scan in similar target plasmas when running low li • Br sensor gain scan from last run is invalid • Loss of RWM control sensitive to increase from li away from low li “bifurcated” state

  3. (LAST RUN) XP1023: Bp sensor feedback phase scan yields new superior settings • General thought that present FB settings were not stabilizing modes well enough • Change from past runs? • Could be due to • New mode ID upgrade (“miu”) compensations • Low li plasma • Both, other reasons • Superior settings • Present value of 270 deg mediocre • 180 and 135 deg settings are best • Gain scan not attempted (yet) 135 deg 90 deg 270 deg (“standard”) 180 deg 225 deg Ip (MA) bN/li = 11.9 139353 139347 139448 139350 139354 Bpn = 1 (G)

  4. A few shots required to reach low li target plasma • Increased lithium deposition • From 150 mg/shot to 300 mg/shot • Tweaked Bp sensor feedback parameters near optimal setting • 180 and 157.5 deg settings are best • Gain scan not attempted (yet) 180 deg 157.5 deg Ip (MA) 139512 139513 139514 139515 Bpn = 1 (G)

  5. Tweaking Bp sensor feeback phase around 180 degrees led to long-pulse, low li, high bN/li • Steady, high bN/li • Between 12 – 12.5 • Low li retained 202.5 deg 180 deg (last run) 180 deg 157.5 Ip (MA) 139347 139515 139516 139517 Bpn = 1 (G)

  6. BR sensors added, MIU compensations off: longest pulse plasmas, high performance • Not enough time to complete full BR sensor gain scan • To be completed during next XP1023 run 180 deg FB phase (last run) BR; Bp compensations off BR feedback on Ip (MA) 139347 139517 139518 139519 Bpn = 1 (G)

  7. XP1023: Three point Br sensor feedback gain scan taken • Highest bN/li of the day, long pulse length • bN/li = 12.4 reached • NSTX highest value = 13 • Increased Br sensor FB gain showed shorter pulse • Br feedback spatial phase may be optimized with Bp sensor FB • Further analysis needed • Results not yet optimized • Need to complete scans Br Gain = 0.75 Br + Bp feedback (Bp Gain = 1) Br Gain = 1.0 Br Gain = 0.5 Ip (MA) bN/li = 12.4 Brn = 1 (G) 10G “limit” 139356 139355 139359 Bpn = 1 (G)

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