DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2013 EXPERIMENTAL CAMPAIGN Review | Direct submission with log-in | Request submission without log-in
Print this page

Print this page
Title	197: Scaling of divertor detachment onset
Name:	Anthony Leonard leonard@fusion.gat.com	Affiliation:	General Atomics
Research Area:	Divertor & SOL Physics	Presentation time:	Requested
Co-Author(s):	--	ITPA Joint Experiment :	No
Description:	The goal is to measure the 2D profile of the divertor plasma as it approaches detachment for testing the boundary plasma modelling codes. The profiles should be measured in L-mode, low power H-mode and high power H-mode.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	Experimental configuration should be LSN with divertor configuration optimized for divertor diagnostics, particularly divertor Thomson and the swing arm probe. There may be some sweeping of the divertor required for full coverage. A density scan should be carried out particularly near detachment. The density scan should also be carried out at different powers, L-mode, low power H-mode and high power H-mode. These data will be used for careful comparison with modelling of detachment with 2D fluid codes.
Background:	The 2D boundary plasma models currently used for prediction of ITER divertor heat flux control currently have difficulty reproducing many of the features observed. Particularly the operational space, or midplane separatrix density, at which divertor detachment occurs, is not properly predicted by the codes. A careful test of these models with detailed diagnostics is needed to isolate issues the models are not addressing correctly. A number of divertor diagnostics have recently been added, upgraded, or repaired, and include, divertor Thomson, swing arm probes, IR camera, carbon flow, and visible and IR periscope. Now is the time to revisit this divertor condition.
Resource Requirements:	LSN with co-beams
Diagnostic Requirements:	All divertor and boundary diagnostics
Analysis Requirements:	Careful reconstruction of divertor profiles and compared to 2D boundary modeling
Other Requirements:	--