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XP627: Non-solenoidal Rampup with HHFW and NBI

Office of Science. Supported by. XP627: Non-solenoidal Rampup with HHFW and NBI. C. Kessel, J. Hosea, D. Mueller, P. Ryan, R. Wilson Princeton Plasma Physics Laboratory NSTX Results Review, 7/26/2006. Basic NSTX Plan for Non-solenoidal Rampup.

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XP627: Non-solenoidal Rampup with HHFW and NBI

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  1. Office of Science Supported by XP627: Non-solenoidal Rampup with HHFW and NBI C. Kessel, J. Hosea, D. Mueller, P. Ryan, R. Wilson Princeton Plasma Physics Laboratory NSTX Results Review, 7/26/2006

  2. Basic NSTX Plan for Non-solenoidal Rampup At low Ip: Establish NICD capability of HHFW, via bootstrap and FWCD Establish NICD capability of NB, via bootstrap and NBCD Determine ability to use HHFW and NB together CHI for plasma initiation and early ramp HHFW for low Ip rampup NBI for higher Ip rampup Ip time HHFW HHFW+NBI CHI

  3. Discharges • 120016-120025, Ip = 600 kA, BT = 4.5 kG, NB sources A and B @ 70 keV • Best shots 120019, 120020, 120021 • 120026-120032, Ip = 500 kA, BT = 4.5 kG, NB sources A and B and C @ 70 keV • Best shots 120027, 120028, 120029, 120030, 120031 • 120033-120035, Ip = 400 kA, BT = 4.5 kG, NB sources A and B @ 70 keV • Best shots 120033, 120034 • 120286-120295, control setting did not allow Ip below 300 kA, lost shots • 120296-120300, Ip = 250 kA, BT = 4.5 kG, HHFW 14 m-1 heating • Best shots 120297 • 120301-120307, Ip = 275 kA, BT = 4.5 kG, HHFW 14 m-1 heating • Best shots 120301, 120306 • 121541-121547, Ip = 400 kA, BT = 5.5 kG, HHFW -7 m-1 co-CD • Best shots 121541, 121543, 121544, 121545, 121546, 121547 • 121548-121550, Ip = 400 kA, BT = 5.5 kG, HHFW -7 m-1 co-CD, NB source A @ 70 keV • Best shots 121550 • 121551-121552, Ip = 300 kA, BT = 5.5 kG, HHFW -7 m-1 co-CD

  4. XP627 Part B: Inject NB’s into Low Ip Plasmas (run 1/2 day) Source A@70 keV Ip = 600, 500, 400 kA Similar Vloop, so higher Wth compensates for higher Ip Ip = 600 kA has lower li

  5. XP627 Part B: Inject NB’s into Low Ip Plasmas (1/2 run day) TRANSP analysis of same discharges indicate that 600 and 500 kA cases give NICD ≈ 250 kA, while 400 kA case is noticeably lower in NBCD and BS due to strong NB losses 600 kA 500 kA 400 kA

  6. XP627 Part B: Inject NB’s into Low Ip Plasmas (1/2 run day) Sources A+B@70 keV Ip = 600, 500, 400 kA Lowest Vloop at 500 kA, li clearly lowest for 600 kA inferring higher BS, but profiles show localized profile modification, higher Pped

  7. XP627 Part A: HHFW Injection into Low Ip Plasmas (1/4 run day) High pressure discharges from 2005 were not reproduced in 2006 at Ip = 250 kA 2005 2006 2006 2005 2006 14 m-1 heating

  8. XP627 Part A: HHFW Injection into Low Ip Plasmas (?? run day) Comparison of NB only (A@70keV),HHFW only (7 m-1 co-CD), and HHFW (7 m-1 co-CD) & NB (A@70 keV) t = 385 ms BT = 5.5 kG BT = 4.5 kG BT = 5.5 kG

  9. Observations • Low Ip NBI case indicate that the non-inductive current drops strongly at 400 kA, compared to 500 kA, is this the limit for using NBI in rampup? • This means the HHFW only phase must deliver a 500 kA plasma 100% non-inductive current to the HHFW+NBI phase • Lowest loop voltage for NB shots was about 0.1 V at 500 kA with 140 kJ and source A+B @ 70 keV • Need to examine this case with TRANSP to see what the non-inductive current breakdown is between BS and NBCD • HHFW injection at low Ip was disappointing this year due to insufficient run time to establish good RF coupling discharges • Higher BT HHFW discharges may make the 7 m-1 phasing more useful but still could not sustain H-mode, similar to 2005 • Combination of NB into HHFW plasmas at low Ip was hampered by MARFEs(?) or some other strong drops in stored energy -- these discharges will determine how high Ip can be sustained non-inductively

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