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Summary of XP-710

Summary of XP-710. D. A. Gates NSTX Results review 7/24/07. XP-710 Status. Shape development complete Achieved non-inductive fraction of 55% nearly equivalent to that in 116318 (NSTX record pulse length) H-mode achieved during current ramp at 5.5kGauss. Desired equilibrium achieved.

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Summary of XP-710

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  1. Summary of XP-710 D. A. Gates NSTX Results review 7/24/07

  2. XP-710 Status • Shape development complete • Achieved non-inductive fraction of 55% nearly equivalent to that in 116318 (NSTX record pulse length) • H-mode achieved during current ramp at 5.5kGauss

  3. Desired equilibrium achieved • Equilibrium parameters: • Target Achieved •  2.7 2.65 • A 1.75 1.6 • li 0.4 0.45 • N >5.5 ~4

  4. Plasma nearly matches 116318(with 2 sources instead of 3) Red 116318, Black 124058

  5. High non-inductive fraction achieved Shot 124058, TRANSP A02 • Achieved 55% non-inductive current fraction (TRANSP) • Ramped linearly up to the end of the shot • Based on EFIT02 (no MSE) - MSE based reconstructions may raise non-inductive current • Reconstructions with MSE have proved problematic

  6. Plasma well controlled • See video

  7. Plasma limited by low frequency MHD mode • Large n=1 mode detected on external locked mode detector • No USXR to confirm mode structure • Thomson shows global plasma deformation • RWM

  8. Summary of XP-710 • Plasma shape achieved • rtEFIT controlled • reliable  ~ 2.6, A = 1.6 • High non-inductive current fraction • Very low flux consumption • Current hole makes reconstruction difficult • Plasma limited by RWM ant N ~ 4

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