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Title 239: Scaling of SOL heat flux
Name:Charles Lasnier () Affiliation:Lawrence Livermore National Laboratory
Research Area:Thermal Transport in the Plasma Boundary Presentation time: Not requested
Co-Author(s): Boedo, Maingi
Description: Make parameter variations to form a database of fluctuation and heat flux measurements. Use Bout to predict fluctuation-induced heat flux transport in the boundary under those conditions, and compare with measurements. Derive experimentally-determined and model-predicted scalings of heat flux, and reconcile them.
Experimental Approach/Plan: Use the two plunging probes, reflectometers, other fluctuation diagnostics to measure Te~ & Ne~ and calculate heat flux across SOL flux surfaces. Measure divertor surface temperature with IRTV, particle temperature and density with fixed probes, to make calculations of divertor heat flux. Then reverse Bt and do it again. Scans of Bt, Ip, density, Pinj. Make measurements for SOL and divertor heat flux in as many poloidal and toroidal places as possible and compare with predictions of heat flux derived from BOUT.
Background: Many previous single machine scalings have been developed, as well as attempts to fit a multi-machine database. Different attempts gave different results, and there was no attempt to coordinate discharges between several machines. We have new Te measurement capability on one of the plunging probes.
Resource Requirements: ELMing H-mode, forward and reversed Bt, beams
Diagnostic Requirements: SOL and divertor diagnostics, boundary fluctuation diagnostics.
Analysis Requirements: SOL and divertor diagnostics, boundary fluctuation diagnostics. Calculate experimentally-derived and model-predicted heat flux scalings and reconcile those.
Other Requirements: --