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Progress Report on NSTX XP-710: Shape Development and Non-Inductive Current Achievements

The XP-710 status report highlights significant advancements in NSTX plasma physics, including the completion of shape development and achievements in the non-inductive current fraction, nearly matching that of record shot 116318 with just two power sources. Increased lithium utilization has enhanced confinement time (42ms vs. 30ms) and H-mode operation was obtained during the current ramp at 5.5 kGauss. Optimal equilibrium parameters were approached, with a 55% non-inductive current fraction observed. Further enhancement is anticipated with the addition of a third power source.

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Progress Report on NSTX XP-710: Shape Development and Non-Inductive Current Achievements

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Presentation Transcript

  1. Summary of XP-710 D. A. Gates NSTX Physics meeting

  2. XP-710 Status • Shape development complete • Achieved non-inductive fraction nearly equivalent to that in 116318 (NSTX record pulse length) but with 2 sources instead of 3. • Lithium raised confinement time enabling results (42ms compared to 30ms at same time in 116318) • H-mode achieved during current ramp at 5.5kGauss (more work to do here)

  3. Equilibrium nearly achieved • Equilibrium parameters: • Target Achieved •  2.7 2.6 • A 1.75 1.55 • li 0.4 0.5 • N >5.5 ~3.5 • Lower beam power lowers li, increasing inner gap, decreasing  • More beam power should improve all parameters

  4. Plasma nearly matches 116318(with 2 sources instead of 3) Red 116318, Black 123547

  5. High non-inductive fraction achieved Shot 123547, TRANSP A01 • Achieved 55% non-inductive current fraction (TRANSP) • Ramped linearly up to the end of the shot • Depending on scaling of confinement with power, could achieve 67 - 73% non-inductive fraction with additional NBI power

  6. Plasma well controlled • See video

  7. XP-710 shape development completed • Lithium raised confinement time • Near record non-inductive fraction with 2 sources • Anxiously awaiting 3rd source

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