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Title	12: Diagnostic spatial cross calibration using edge sweeps in QH-mode
Name:	Keith Burrell Burrell@fusion.gat.com	Affiliation:	General Atomics
Research Area:	Pedestal Structure	Presentation time:	Not requested
Co-Author(s):	C. Holcomb, G.R. McKee, W.M Solomon	ITPA Joint Experiment :	No
Description:	Perform spatial cross calibration of the CER, BES and MSE systems using edge sweeps in QH-mode discharges	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	Run QH-mode discharges like 128542 with edge sweeps which change Rmidout from 2.29 m to 2.16 m. Tune the CER system to look at the Doppler-shifted D-alpha from the neutral beams. (BES and MSE already view this wavelength). Modulate the beams to obtain the needed data. The various beam combinations typically take 6 shots to complete.
Background:	In order to successfully combine data from the CER, BES and MSE systems for edge plasma studies, we need to know the relative spatial calibration of these system to millimeter accuracy. This has been done before using edge sweeps in QH-mode plasmas. This calibration needs to be done again now that we have the benefits of improved spatial calibrations using the component measurement arm. Getting the spatial cross calibration of the MSE views of the 30 and 210 beams is an essential first step in using MSE to determine the edge current density profile.
Resource Requirements:	Reverse Ip. 8 NBI sources.
Diagnostic Requirements:	CER, MSE, BES are essential. Standard profile diagnostics are also needed. ECE-I for EHO studies.
Analysis Requirements:	--
Other Requirements:	--