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Preliminary Results: H-mode Confinement Scaling from XP401

Initial findings on long-pulse H-mode confinement scaling experiment XP401, focusing on power scans, disruption events, confinement comparisons, and power scaling trends at varying currents and power levels. The study reveals insights into confinement time and power scaling behaviors that can impact future fusion experiments.

shaunna-kelleher
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Preliminary Results: H-mode Confinement Scaling from XP401

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  1. Preliminary Results from XP401 S.M. Kaye NSTX Physics Meeting 19 April 2004

  2. XP401: H-mode Confinement Scaling • Objectives of first phase of experiment • Establish current and power scaling of long-pulse H-mode confinement • Ip=0.62 – 1.2 MA, PNBI = 1 to 3 sources (at 90 keV) • Experimental approach • Attempted with DND plasmas at k~1.9, d~0.45 (identity comparison with MAST) • Power threshold too high to perform power scan (3-3.5 MW) • Attempted with LSN at modest k, d • Discharge disrupted at 3 source level • Success with long-pulse, “PF1b” LSN discharges • k=2-2.2, d=0.5-0.7 • “Nearly” DND

  3. XP401: H-mode Confinement Scaling • Preliminary results • Power scans with 1, 1.5 (1 source modulated), 2 and 3 performed at all currents • Did not include 1.5 source shots in preliminary results • Power thresholds near 1-1.5 source level • Type III ELMs observed for first time • Highest current, power plasma disruptive • Confinement at 1 source (with A or B) comparable; delayed L-H transition with Source C • Stored energy exhibits almost linear dependence on plasma current at fixed Ptot • Power scaling is LESS than P-0.5 at fixed Ip • Still need to sort out differences between fixed parameter scans and statistical results

  4. Ip = 0.8 MA, 2 Sources

  5. Type III ELMS Observed 0.62 MA 1.5 Sources 2 Sources 3 Sources

  6. Ip Dependence For 2 Sources 1.2 MA 1.06 MA 0.8 MA 0.62 MA

  7. Ip Dependence For 3 Sources 1.06 MA 0.8 MA 0.62 MA

  8. Ip Scaling of Confinement Time HL ~ IP0.74

  9. Power Scaling HL ~ P-0.57

  10. Effect of Fueling Location, Duration

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