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	172: High betaN with off-axis injection at reduced Bt (if 2011-level beam power is available)
Name:	John Ferron ferron@fusion.gat.com	Affiliation:	General Atomics
Research Area:	Steady State Heating and Current Drive	Presentation time:	Not requested
Co-Author(s):		ITPA Joint Experiment :	No
Description:	Test the betaN limit with q_min >2 and broad pressure profiles produced by off-axis injection. Use as a basis one of the Bt = 1.4 T discharges from 2012 which were produced without the expected 14 MW neutral beam power. Do the experiment with both constant Bt and a negative Bt ramp as was studied during 2012.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	If neutral beam power about 14 MW is available during 2013 as it was during 2011, this experiment could be performed. During 2012 experiments we learned how to produce discharges with q_min >2 at Bt = 1.4 T. So that doesn't need to be redone.. We would start with one of those discharges and put in the higher neutral beam power in order to push to higher betaN. We would also test the betaN limit with the broader current profile anticipated with a negative Bt ramp, making use of what we learned about this type of discharge during 2012 experiments.
Background:	During 2012 experiments, the intention was to test the betaN limit at q_min >2 where betaN was limited to a maximum of 3.3 in 2011. The idea was to reduce Bt where less beam power would be required. However, the beam power actually available during 2012 experiments was less than the beam power available in 2011 so the maximum betaN achieved was about the same.
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