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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 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 -

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  1. L-H Threshold Power Study- Ramp-Up vs Steady Ip Phase - S. M. Kaye

  2. 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

  3. 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

  4. DN LSN

  5. 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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