DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 434: Modulate I-coils to induce edge currents and affect/study ELMs | ||
| Name: | Francesco Volpe ( |
Affiliation: | ORAU |
| Research Area: | ELM Control & Pedestal Physics | Presentation time: | Requested | Co-Author(s): | -- |
| Description: | Use ac currents in the I-coils to induce currents in the plasma edge and so perturb the edge current above/below the peeling boundary. | ||
| Experimental Approach/Plan: | Starting with a marginally peeling-stable plasma, modulate current in the I-coils on a time-scale comparable with the current-diffusion time. Several kA of current might be necessary. | ||
| Background: | External coils were used in COMPASS-D to induce currents in the plasma edge. Indirectly, they also affected the edge pressure gradient. Although not measured directly (COMPASS-D was not equipped with MSE, Li-beam or edge Thomson scattering), these perturbations were strong enough, according to EFIT, to cause a modulation across the peeling limit, which, in fact resulted in recursive stabilization/destabilization of ELMs [S.J. Fielding et al., EPS 2001, P5.014, Sec.2]. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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