DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 149: Hybrid beta limit at lower rotation | ||
| Name: | Robert J. La Haye ( |
Affiliation: | General Atomics |
| Research Area: | Rotation Physics | Presentation time: | Requested | Co-Author(s): | R. Buttery, D. Brennan |
| Description: | q95=4.4 hybrid discharges at 2/3 of 4li go 2/1 unstable when rotation is greatly reduced with counter beams added. No systematic experiment of varying the rotation and then raising beta has been made to find the role of rotation on the limit. | ||
| Experimental Approach/Plan: | Reproduce hybrid discharges well below 4li,
vary the rotation, and then slowly raise beta, from shot to shot. Similar was already done in 2006 for the sawteething H-mode. | ||
| Background: | The sawteething H-mode shows a considerable decrease in the 2/1 unstable beta as rotation is reduced from all co beams to as far on the counter side as was tried. | ||
| Resource Requirements: | At least 4 co and 2 counter beams.
Cryopumping etc as usual for hybrid. | ||
| Diagnostic Requirements: | Usual diagnostics. | ||
| Analysis Requirements: | PESTIII for tearing. | ||
| Other Requirements: | None. | ||
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