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Study of Slow Evolution L-H Transitions

Study of Slow Evolution L-H Transitions. Ideal situation for studying evolution of Ti, velocity flows, and Er before L-H transition.

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Study of Slow Evolution L-H Transitions

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  1. Study of Slow Evolution L-H Transitions • Ideal situation for studying evolution of Ti, velocity flows, and Er before L-H transition It has previously been observed in discharges with unfavorable drift direction (reversed field LSN and normal field USN) that there is a slow evolution of certain parameters preceding the L-H transition. The edge  temperature pedestal builds up slowly over a long period of time preceding the transition.  Edge density pedestal is not effected.  Blatant figure thievery from Amanda Hubbard (2006 APS)

  2. Proposal • Create L-H transitions in reversed field LSN discharges • Similar proposals by Amanda Hubbard, and Matt Reinke, anyone else? • Slow evolution enables better time resolution of edge parameters prior to L-H transition using active charge exchange • Examination of Ti pedestal formation • Details of poloidal and toroidal edge rotation • Comparison of Er evolution in reversed field and normal field LSN transitions. • Discharge Requirements: • For comparison between reversed and normal field want fixed plasma shape: k~1.65, δ~.4 • B~5.4T • Need RF power 3-5MW, pulse length .5-1 s • Vary Ip0.5-1.5MA • Density 0.5 -1.5x1020 m-3 • One run day each field direction

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