DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 379: Can RMP strike point-splitting spread divertor heat flux? | ||
| Name: | Ilon Joseph ( |
Affiliation: | University of California, San Diego |
| Research Area: | Thermal Transport in the Plasma Boundary | Presentation time: | Not requested | Co-Author(s): | JA Boedo, TE Evans, ME Fenstermacher, M Jakubowski, CJ Lasnier, RA Moyer, MJ Schaffer, O Schmitz, WP West |
| Description: | The goal is to widen the effective strike point heat flux area by increasing the size of the magnetic footprint. Carefully characterize the heat and particle flux deposition profiles and optimize over n. Obtain clear confirmation of splitting in n=3 case, using RFA if necessary. | ||
| Experimental Approach/Plan: | At least 2 run days: begin with n=1 case, rotating at slow ~10Hz rate in both L-mode and H-mode discharges based on ITER similar reference cases. Continue to n=2 and n=3 (non-rotating) optimization study on next run day. | ||
| Background: | RMP strike point splitting has been observed during application of RMP, as well as during locked modes. Recent E3D calculations by Joseph et al., showed that an increase in overall plasma wetting could be achieved in n=3 mode, along with a characteristic nonaxisymmetric structure. In contrast to changes in particle flux that are routinely observed in all cases, while heat flux splitting has been clearly observed for n=1, and to some degree n-2 RMPs, no confirmation of nonaxisymmetric deposition has yet been obtained in n=3. | ||
| Resource Requirements: | rotating I-coil | ||
| Diagnostic Requirements: | Cameras: ***IR***, DIMES, TAN_TV, fast camera
Langmuir probes: array, reciprocating | ||
| Analysis Requirements: | TRIP3D, SURFMN, IPEC, UDEGE, EMC3-EIRENE, FINDIFF | ||
| Other Requirements: | -- | ||
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