Assessment of Edge Turbulence and Convective Transport through Velocity Field Analysis
- Univ. of Colorado, Boulder, CO (United States). Center for Integrated Plasma Studies
Over the course of this grant period, we have conducted three major studies, each of which has resulted in a primary publication (described below): First, we investigated the flow and shear behavior of the edge plasma and scrape-off layer (SOL) in NSTX using the GPI diagnostic. Calculation of local, time resolved velocity maps using the hybrid optical flow and pattern matching velocimetry code enabled analysis of turbulent flow and shear behavior in these plasmas. Second, we used GPI measurements made during RF heated H-mode operation, to identify intermittent periodic edge intensity fluctuations which precede ELMs and ELM-induced back transitions from H-mode to Lmode. These edge oscillations have a well-defined mode structure and are visible up to 100-200 μs preceding the ELM events. Finally, we performed an in-depth investigation between the fluctuation measurements made by the GPI and BES diagnostics on NSTX.
- Research Organization:
- Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- DOE Contract Number:
- FG02-08ER54995
- OSTI ID:
- 1176964
- Report Number(s):
- DOE-Colorado-11111
- Country of Publication:
- United States
- Language:
- English
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Flow and shear behavior in the edge and scrape-off layer of L-mode plasmas in National Spherical Torus Experiment
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