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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L h threshold power study ramp up vs steady i p phase

L-H Threshold Power Study- Ramp-Up vs Steady Ip Phase -

S. M. Kaye


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


L h threshold power study ramp up vs steady i p phase

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LSN


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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