1 / 6

Current Profile Modifications and Fast Ion Loss from BAAEs/EPMs

Current Profile Modifications and Fast Ion Loss from BAAEs/EPMs. D. Darrow, et al. January 15, 2009. EPMs. 119624. BAAE/EPM bursts expel NB ions & may redistribute current. Bursts are often seen during Ip ramp up, causing neutron drops and possibly contributing to rapid j(r) redistribution

dacey
Download Presentation

Current Profile Modifications and Fast Ion Loss from BAAEs/EPMs

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Current Profile Modifications and Fast Ion Loss from BAAEs/EPMs D. Darrow, et al. January 15, 2009

  2. EPMs 119624 BAAE/EPM bursts expel NB ions & may redistribute current • Bursts are often seen during Ip 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

  3. Bursts also seen during Ip flattop—simplest situation to study

  4. Experimental plan • Reload shot with bursts during flattop (127383, 127393, or 127397) from 2008 • Check for presence of bursts • Reduce Ip or alter density if no bursts • Document effects of bursts on j(r), fast ion loss • Focus on effect of repeated bursts as a single burst appears to have indistinguishable effect on MSE • Document mode numbers, profiles & amplitudes • Repeat shots with n=3 braking to get data on mode structure near wrot=0

  5. Key diagnostics • MSE: j(r, t) • Mirnov coils: mode n, freq, & amplitude • FIDA: fNB(E, r, t) • NPA: fNB(E, r, t) • CHERS:wrot(R, t) (for fast ion loss torque) • Neutron detectors: Sn(t) • sFLIP: Gloss(E, c, t) • SXR array: mode structure • FIReTIP: mode structure • Reflectometer: mode structure? (H-mode) • High-k scattering: mode structure info

  6. Analysis emphases • MSE: Focus on cumulative effect of multiple bursts as bursts occur too frequently to separate in MSE data; 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?

More Related