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Title	227: Mechanisms leading to termination of the runaway discharges and effects on PFC energy deposition
Name:	Alberto Loarte-Prieto Alberto.Loarte@iter.org	Affiliation:	ITER Organization
Research Area:	Disruption Mitigation	Presentation time:	Requested
Co-Author(s):	E. Hollmann, J.R. Martin-Solis	ITPA Joint Experiment :	No
Description:	Determine characteristics of runaway deposition on PFCs (magnitude, timescales and area) dependence on processes leading to runaway discharge termination.	ITER IO Urgent Research Task :	Yes
Experimental Approach/Plan:	Create large (200 kA+) RE beam and determine the runaway deposition characteristics on the DIII-D wall/divertor depending on the type of process leading to the termination of the discharge vertical upwards/downwards drift, radial inwards drift (or others) and on the speed of the drift.
Background:	Deposition characteristics of the RE plasma energy at their termination are poorly characterised for extrapolation to ITER (magnitude, timescales and areas). In part this is due to the RE beams having a significant magnetic energy that can be converted to magnetic energy in its termination. This conversion depends on the timescale of the runaway loss itself and this timescale is found to depend on the mechanism/details of the runaway discharge loss upwards/downards vertical drift and radial inwards drift which make extrapolation to ITER very uncertain.
Resource Requirements:	1/2 to 1 run day. Reliable scheme of material injection for runaway discharge production.
Diagnostic Requirements:	Runaway diagnostics and IR
Analysis Requirements:	Existing experiments
Other Requirements: