DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 123: Pursue the q_min >2 path toward high noninductive fraction discharges | ||
| Name: | John Ferron ( |
Affiliation: | General Atomics |
| Research Area: | Fully Noninductive High Beta Operation | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | Continue the effort toward moving the high-performance phase earlier in the discharge when q_min is higher than the typical value near 1.5 that was the primary focus in 2006-2007. Use feedback control of the q_min evolution to reliably form the target q profile. Focus on achieving high betaN values in the time interval available before q_min drops below 2. If necessary, use ECCD stabilization of NTMs. | ||
| Experimental Approach/Plan: | Experiments in 2006-2007 suffered from a wide variety of problems preventing high q_min at high betaN to be achieved reliably. Experiments using the q feedback control have been reasonably successful at producing elevated values of q_min at the end of the current ramp. Using feedback eliminates the need to spend a lot of experiment time playing with the early beam timing. So the approach would be to focus on reliability with feedback control of q. The q control would be integrated with the betaN control to allow a smooth transition to high betaN values. In the past, even though q_min is above 2, NTMs have still been observed. So if necessary, ECCD stabilization would be used. | ||
| Background: | A couple of days were spent in 2006-2007 attempting to produce high bootstrap current fraction discharges with q_min >2. The amount of time devoted to this parameter range is a small fraction of what has been spent on the case with q_min near 1.5. However, the possible benefit of operating with higher values of q_min is higher bootstrap current at a given betaN. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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