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XP-713: Beta Scan in Weakly-Shaped Plasmas S. M. Kaye

XP-713: Beta Scan in Weakly-Shaped Plasmas S. M. Kaye. Beta dependence of confinement a high-priority ITPA issue Previous NSTX results at k =2.1, d =0.7 indicated no degradation of confinement on beta (small ELMs at all beta)

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XP-713: Beta Scan in Weakly-Shaped Plasmas S. M. Kaye

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  1. XP-713: Beta Scan in Weakly-Shaped PlasmasS. M. Kaye • Beta dependence of confinement a high-priority ITPA issue • Previous NSTX results at k=2.1, d=0.7 indicated no degradation of confinement on beta (small ELMs at all beta) • Results from other devices with weaker shaping indicate strong degradation • Redo beta scan on NSTX with k=1.8 – 1.9 and d=0.4 • Essentially a power scan as previously done, with re, n*e ~ constant • See significant change in ELM behavior, amplitude, frequency as power increases

  2. Initial results indicate a non-linear dependence of stored energy with power • Need to determine confinement time, beta from kinetics to actually conclude anything, but the picture is not as clear (initially, at least) as with stronger shaping

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