DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 376: RFA assisted RMP-ELM control | ||
| Name: | Ilon Joseph ( |
Affiliation: | University of California, San Diego |
| Research Area: | ELM Control & Pedestal Physics | Presentation time: | Not requested | Co-Author(s): | AH Boozer, JE Menard, JK Park, RA Moyer, TE Evans |
| Description: | Unlike the DIII-D I-coils which work well for ELM supression, the currently favored choice of ITER RMP-ELM control coils is localized on the outer midplane surrounding the outer port plugs. The advantage of this configuration is that one can attempt to use RFA to enhance the ELM-control efficiency of a high-n RMP localized on the outboard midplane. | ||
| Experimental Approach/Plan: | Investigate RFA for static n=2 and n=3 C-Coil and I-Coil fields. | ||
| Background: | The linear plasma response to external perturbations can enhance the magnitude of the resulting field by the ratio of delta W to the energy of the vacuum: delta Wvac. In general, the least stable mode is strongly localized on the outboard midplane in the region of unfavorable curvature. The localization has been shown to increase the effective width of the mode spectrum by roughly a factor of 2 over the vacuum calculation, which is precisely the amount needed to generate a sizeable field line pitch-resonant component of the spectrum. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | cameras: IR, DIMES, XPT-TAN-TV ...
Langmuir probes: array, reciprocating, ... | ||
| Analysis Requirements: | SURFMN, DCON, IPEC | ||
| Other Requirements: | -- | ||
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