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	306: Edge turbulence and blob generation
Name:	David Smith none	Affiliation:	ZZZ
Research Area:	Divertor & SOL Physics	Presentation time:	Not requested
Co-Author(s):		ITPA Joint Experiment :	No
Description:	Observe and characterize the spatial transition from drift-wave/interchange turbulence in or near the pedestal to intermittent blobs in the SOL. Directly measure density fluctuations in the pedestal and near-SOL regions with BES to compliment theory models of blob generation.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	Target stationary L-mode (low edge flow shear) and H-mode (high edge flow shear) plasmas with minimal MHD activity. Scan 2D BES measurements across the pedestal and near-SOL regions. If feasible, augment BES measurements with plunging edge probe measurements. While maintaining stationary discharges, modify edge pressure profiles with fueling, heating, and rotation strategies.
Background:	Theory models attribute SOL blob generation to the flow shear decorrelation of radial streamers associated with drift-wave/interchange turbulence in or near the LCFS (Myra et al (2006), Russell et al (2011), D'Ippolito et al (2011)). In addition, models and simulations indicate blob size is related to the pressure gradient in the blob birth zone, and nonlinear saturation mechanisms for turbulence govern blob birth rates. BES density measurements of the turbulence-blob interplay near the LCFS will be useful for validation of blob generation models and simulations.
Resource Requirements:	NBI
Diagnostic Requirements:	BES
Analysis Requirements:
Other Requirements: