l h threshold power study ramp up vs steady i p phase
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L-H Threshold Power Study - Ramp-Up vs Steady I p Phase -. S. M. Kaye. Objective is to determine P LH in ramp vs steady conditions at constant I p. High priority issue for ITER Implications for scenario development, heating power systems ITPA Joint Expt : PEP-33

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objective is to determine p lh in ramp vs steady conditions at constant i p
Objective is to determine PLH in ramp vs steady conditions at constant Ip
  • High priority issue for ITER
    • Implications for scenario development, heating power systems
  • ITPA Joint Expt: PEP-33
    • Along with C-Mod, DIII-D, EAST and TCV
  • Preliminary experiments already performed on EAST
    • Found slightly higher PLH during ramp-up phase than during Ipflattop
  • Not sure of how constant other parameters were held
    • Need to do additional dedicated experiments
l h transition in current ramping up and down phase east
L-H transition in current ramping up and down phase (EAST)

L-H transition in current ramping down phase

L-H transition in current ramping up phase

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planned experiment
Planned Experiment
  • Choose baseline Ip (800 kA?)
    • Find PLH under standard conditions during Ip ramp (early NBI)
      • Will need to vary NBI power to determine threshold power, PLH
    • When found, change Ipwaveform to flattop at that current
      • Delay NBI until after flattop starts
      • Increase (or decrease) beam voltage to determine flattop PLH
  • Choose higher Ip and repeat
  • Vary Ip ramp rate
    • Determine PLH at chosen current as a function of ramp rate
    • Scenarios to be developed by ASC?
  • Approximately a 1 day XP
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