SMK – XP 1 XP 811: Effect of Rotation on Energy/Impurity Confinement S. Kaye, L. Delgado-Aparicio Joule Milestone Description –XP directly addresses Joule.

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Presentation transcript:

SMK – XP 1 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 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

SMK – XP 2 Effect of Rotation on Confinement (cont’d) Experimental Plan –Use 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 – (or other) as baseline discharge Need to develop MHD quiescent condition without Lithium –Poloidal and toroidal CHERS, ERD

SMK – XP 3 Possible Baseline Shots , , 4.5 kG, 1.0 MA,  B ~ ,  T ~ ,  B ~ (2006 shot, XP613) Sources A & 90 kV, and source 70 kV. Turn of source 300 ms , 4.5 kG, 1.0 MA,  B ~2.3,  T ~0.8,  B ~ (2007 shot, XP740) Sources A & 90 kV. Lithium evaporated (214 mg)!

SMK – XP 4 Shot List Shot Development –Attempt to attain MHD quiescent condition with no Lithium, shot (2-4 shots); no n=3 braking –If this fails, attempt MHD quiescent condition with (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 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