XP 905: Current Profile Modifications and Fast Ion Loss from BAAEs/EPMs D. Darrow, et al. April 8, 2009.

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Presentation transcript:

XP 905: Current Profile Modifications and Fast Ion Loss from BAAEs/EPMs D. Darrow, et al. April 8, 2009

BAAE/EPM bursts expel NB ions & may redistribute current Bursts are often seen during I p ramp up, causing neutron drops and possibly contributing to rapid j(r) redistribution Important for NHTX, VNS, & ITER to quantify j(r) transport due to modes EPMs

Mode chirps & has multiple n Neutron drops & fast ion loss concurrent with multi-n overlap Multi-n Frequency chirp Mirnov coil data Frequency (kHz)

Bursts also seen during I p flattop— simplest situation to study

Experimental plan-1 Reload 2008 shot with bursts during flattop: (alternates: , or ) 900 kA, 0.44 T, 3 beams at 90 kV Check for presence of bursts

Experimental plan-2 If no bursts: Reduce I p by steps of 100 kA until bursts recur With bursts present, increase gas puff to increase n e in steps of ≤1x10 19 m -3 to reduce mode fast ion drive & increase interval between bursts. Goal: 50 ms between bursts. [2 hour limit on this step] If 50 ms spacing not attained: Increase I p in steps of ≤100 kA until 50 ms spacing attained [2 hour limit on search]

Experimental plan-3 Work with 50 ms separated bursts, if attained, otherwise measure effect of series of bursts Document effects of bursts on j(r), fast ion loss

Experimental plan-4 Document mode numbers, profiles & amplitudes Reserve 2 hours for: Repeat shots with n=3 braking to get data on mode structure near  rot =0

Key diagnostics MSE: j(r, t) Mirnov coils: mode n, freq, & amplitude FIDA: f NB (E, r, t) NPA: f NB (E, r, t) CHERS:  rot (R, t) (for fast ion loss torque) Neutron detectors: S n (t) sFLIP:  loss (E, , t) SXR array: mode structure FIReTIP: mode structure Reflectometer: mode structure? (H-mode) High-k scattering: mode structure info

Analysis emphases MSE: Focus on effect of single burst or cumulative effect of multiple bursts, depending upon what is obtained; identify amount of current transported to or from each flux surface Mode profile diagnostics: fit best mode radial profiles and compare with NOVA predictions for BAAE under those conditions; compare also at lowest attainable toroidal rotation: how well do modes match BAAE theory?