DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 378: Counter Ip RMP-ELM suppression | ||
| Name: | Ilon Joseph ( |
Affiliation: | University of California, San Diego |
| Research Area: | ELM Control & Pedestal Physics | Presentation time: | Not requested | Co-Author(s): | TE Evans, A Garofalo, M Heyn, I Ivanov, SV Kasilov, RA Moyer, AM Runov |
| Description: | The efficiency of RMP-ELM supression in counter Ip plasmas will be explored. The study should clarify the role of diamagnetic rotation physics on RMP penetration and the subsequent impact on ELM control. | ||
| Experimental Approach/Plan: | Run counter-Ip H-modes chosen for stability and field line pitch-resonant edge q95 ~ 3.5-3.7. Apply n=3 I-coil for good measure. | ||
| Background: | Both 2-fluid and kinetic theory of RMP penetration have shown a strong dependence of the amount of tearing on the rate of rotation relative to the rest frame of the electrons. This implies that, unlike the single fluid theory, the diamagnetic electron flow is the key player in the penetration physics. Since the electrons flow in the co-beam direction in a counter-Ip discharge, the plasma may be less sensitive to tearing by external perturbations. In fact, previous studies of resonant field braking in counter NBI plasmas have shown an improvements in particle confinement rather than particle pumpout! A serious study is needed to determine whether ELM control can be achieved, and if so, whether it will be the direct effect of the 3D field on ELM stability that is responsible for the change in behavior. | ||
| Resource Requirements: | counter-Ip | ||
| Diagnostic Requirements: | cameras: IR, DIMES, TAN-TV, Fast Camera, Langmuir probes | ||
| Analysis Requirements: | TRIP3D, SURFMN, IPEC, kinetic wave code | ||
| Other Requirements: | -- | ||
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