DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2013 EXPERIMENTAL CAMPAIGN Review | Direct submission with log-in | Request submission without log-in
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Title	179: Snowflake in AT Plasma
Name:	Steve Allen allens@fusion.gat.com	Affiliation:	Lawrence Livermore National Laboratory
Research Area:	Steady State Heating and Current Drive	Presentation time:	Not requested
Co-Author(s):	C. Holcomb, V. Soukhanovskii	ITPA Joint Experiment :	No
Description:	As the snowflake divertor option is well suited to high triangularity plasmas, it seems like a good idea to try to develop a scenario that has AT plasma performance at high triangularity with the snowflake divertor.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	Ideally, the snowflake at high triangularity would be developed in a single null configuration - or at least a drsep of several centimeters. Then, as confidence is obtained, an AT scenario closer to the current standard - i.e. almost double null with small drsep could be attempted. The snowflake divertor configuration should allow spreading of the heat flux by the geometric magnetic flux expansion.
Background:	Previous snowflake operation has shown effective reduction of the divertor heat flux - the snowflake is a compact divertor configuration.
Resource Requirements:	As the experiments move closer to the current "standard" AT configurations, i.e. with small drsep, Plasma Control of the separate x-points would be beneficial.
Diagnostic Requirements:	New IR periscope to view the divertor under the shelf. Possible new IR periscope viewing the divertor.
Analysis Requirements:
Other Requirements: