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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

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)

proposal
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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