DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2013 EXPERIMENTAL CAMPAIGN Review | Direct submission with log-in | Request submission without log-in
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Title	28: Role of profile evolution and energy transfer in L-H transition
Name:	Jose Boedo boedo@fusion.gat.com	Affiliation:	University of California, San Diego
Research Area:	L-H Transition	Presentation time:	Not requested
Co-Author(s):	G. Tynan, D. Rudakov, L. Schmitz, T. Rhodes, G. McKee, Z. Yan	ITPA Joint Experiment :	No
Description:	Previous experiments using the i-phase regime as a tool to explore the detailed physics of the L-H transition revealed that slow profile evolution played an important role on the final transition dynamics. Energy transfer from high frequency to low frequency also plays a key role.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	Propose to run I-phase discharges and study the evolution of the Grad-P terms and their role on the final transition. We will also take dedicated data to be able to calculate bi-coherency and make the flow of energy from high to low frequencies clear.
Background:	Recent work done in 2012 by Tynan, Schmitz and Boedo to clarify the role of Reynolds Stress in the L-H transition also found a significant effect from slowly evolving profiles. Also energy transfer to the zonal flows was identified.
Resource Requirements:	ECH and DIII-D some NBI and diagnostics
Diagnostic Requirements:	Scanning probes, reflectometry, BES, DBS, CER.
Analysis Requirements:	Of the diagnostics above
Other Requirements: