DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 410: Pedestal width dependence on Beta | ||
| Name: | Anthony W Leonard ( |
Affiliation: | General Atomics |
| Research Area: | ELM Control & Pedestal Physics | Presentation time: | Not requested | Co-Author(s): | R. Groebner, T. Osborne, P. Snyder |
| Description: | Use variations in shape, q95, and q profile to determine factors that affect the pedestal width dependence on global beta. | ||
| Experimental Approach/Plan: | 1. Confirm the lack of pedestal width scaling in the LSN hybrid case.
2. Confirm the high triangularity LSN case where the pedestal does scale with global beta. 3. Adjust case #2 for a similar shape and q95 as in case #1. 4. If case #3 pedestal still scales with beta, adjust the early heating to match the q profile and NTM activity of case #1. | ||
| Background: | During the previous year's experiment, a beta scan in a LSN hybrid did not produce a significant change in the pedestal height. This is the only case so far observed where the pedestal beta did not increase with global beta. The result appears robust and reproducible. This experiment will seek to determine which factor is responsible for this change in scaling. Isolating this controlling factor should provide insight into the physical mechanisms controllin the pedestal width. | ||
| Resource Requirements: | LSN with pumping and 5 sources of co-NBI | ||
| Diagnostic Requirements: | All pedestal diagnostics | ||
| Analysis Requirements: | Pedestal profile and stability analysis | ||
| Other Requirements: | -- | ||
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