DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 188: ELM control with a single row of RMP coils | ||
| Name: | Ted Strait ( |
Affiliation: | General Atomics |
| Research Area: | ELM Control & Pedestal Physics | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | The goal of this experiment is to determine what degree of ELM control is possible with a single row of RMP coils. If ELMs are not completely suppressed, can their frequency be modified without adverse effects on plasma performance? What is the impact on plasma rotation and H-mode barrier? How do the results (impact on ELMs and rotation braking) depend on toroidal mode number? The effects of the C-coil and a single row of I-coils are to be compared, since each has similarities and differences from the proposed midplane port plug coils for ITER. | ||
| Experimental Approach/Plan: | In an ITER-like plasma shape, apply n=3 perturbations using the C-coil and (separately) a single row of I-coils. Use a slow sweep of q95 to look for ELM suppression or modification during resonances. Vary the amplitude of the perturbation.
As a second phase of the experiment, compare n=3 vs. n=2 perturbations. The choice of upper vs. lower I-coils should be based on calculations of the RMP spectrum in the ITER-like plasma shape. If time permits, both upper and lower coils could be tried. | ||
| Background: | The current plan for RMP coils in ITER is a single row of port plug coils at the midplane. We need to learn whether such a configuration can be effective for ELM control, and whether there are prohibitive side effects. | ||
| Resource Requirements: | I-coils | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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