DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 471: Dependence of core rotation on dRsep | ||
| Name: | Wayne M. Solomon ( |
Affiliation: | Princeton Plasma Physics Laboratory |
| Research Area: | Rotation Physics | Presentation time: | Not requested | Co-Author(s): | C.C. Petty |
| Description: | The goal is to see how the edge plasma conditions related to the biasing of the plasma null affects the plasma rotation. | ||
| Experimental Approach/Plan: | The plasma will be modulated between upper and lower single null (dRsep modulation). The modulation period should be comparable but less than the energy/momentum confinement time, so 10 Hz is probably optimal. CER beams need to be modulated with a suitable matching period to allow proper Fourier analysis. This should be repeated for several fixed power conditions and different densities. | ||
| Background: | Preliminary investigations in hybrid plasmas have shown that the central rotation is strongly influenced by the biasing of the null. In these original studies, the dRsep modulations were performed at constant beta with beta-feedback control. The changes in confinement associated with the rotation modulation resulted in approximately a factor of 4 modulation peak-to-peak in the power, which confuses the interpretation. | ||
| Resource Requirements: | Number of neutral beam sources: 6+
Machine Time: 1 day Experiment | ||
| Diagnostic Requirements: | CER, Mach probe measurement of SOL flows if possible | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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