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XP 811: Effect of Rotation on Energy/Impurity Confinement S. Kaye, L. Delgado-Aparicio

XP 811: Effect of Rotation on Energy/Impurity Confinement S. Kaye, L. Delgado-Aparicio. Joule Milestone Description XP directly addresses Joule milestone Application of n=3 to vary plasma rotation; assess effect on energy confinement and transport Background Attempts last year mixed

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XP 811: Effect of Rotation on Energy/Impurity Confinement S. Kaye, L. Delgado-Aparicio

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  1. XP 811: Effect of Rotation on Energy/Impurity ConfinementS. Kaye, L. Delgado-Aparicio • Joule Milestone • Description • XP directly addresses Joule milestone • Application of n=3 to vary plasma rotation; assess effect on energy confinement and transport • Background • Attempts last year mixed • Dedicated XP failed to produce long-lived discharges (MHD appeared early) • XP740 (effect of rotation on NTM threshold) produced longer plasmas (up to 0.7 s) • Some effect seen 1

  2. Effect of Rotation on Confinement (cont’d) • Experimental Plan • Use 123848 as baseline (from XP740), or alternative (see next VG) • Two NBI sources • Apply n=3 fields continuously starting from 0.3 s • Increase amplitude of n=3 current from 0 to 800 kA (or to max as set by destabilization of MHD) • Assess effect on rotation, confinement (global and local) • Impurity injection in alternate shots • Time required: 1 day • Possible division into ½ + ½, depending on condition, quality of data (especially pCHERS) • Special requirements • 123848 (or other) as baseline discharge • Need to develop MHD quiescent condition without Lithium • Poloidal and toroidal CHERS, ERD 2

  3. Possible Baseline Shots • 123848, 4.5 kG, 1.0 MA, kB~2.3, dT~0.8, dB~0.4-0.5 (2007 shot, XP740) • Sources A & C @ 90 kV. Lithium evaporated (214 mg)! • 121154, 121162, 4.5 kG, 1.0 MA, kB~2.2-2.3, dT~0.7-0.8, dB~0.4-0.5 (2006 shot, XP613) • Sources A & B @ 90 kV, and source C @ 70 kV. Turn of source C @ 300 ms 3

  4. Shot List • Shot Development • Attempt to attain MHD quiescent condition with no Lithium, shot 123848 (2-4 shots); no n=3 braking • If this fails, attempt MHD quiescent condition with 121154 (2-4 shots); no n=3 braking • If failure in ½ day: Cut losses and move on • Return later in no-Li portion of run, or with Li • If successful in either condition • Increase n=3 fields in 4 to 5 steps • 400 kA, 600 kA, 650 kA, 700 kA, …. until MHD shortens discharge • Ensure no large islands at any n=3 current (SXR, profiles) • 3 shots/condition: no impurity injection, impurity injection @ 400 ms, no impurity injection • 15-21 shots • Biggest issues for this XP are • Attaining MHD quiescent condition • Avoiding large islands in edge • Shot reproducibility 4

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