DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 295: ELM suppression by single-row coil sets | ||
| Name: | Michael J. Schaffer ( |
Affiliation: | General Atomics |
| Research Area: | ELM Control & Pedestal Physics | Presentation time: | Not requested | Co-Author(s): | Evans, Fenstermacher, Moyer, Joseph expected |
| Description: | Apply n=3 magnetic perturbations up to the full allowable coil currents from single-row coil arrays, e.g., the C-coil and the upper or lower row I-coils. Determine how much ELM reduction and possibly suppression is obtained before effects like slow rotation and the onset of internal instabilities degrade the plasma. Measure the accompanying plasma profile changes and compare with conventional two-row ELM suppression. A single I-coil row is vertically narrower than the C-coil, and the proposed ITER port plug coils are narrower than either. | ||
| Experimental Approach/Plan: | -- | ||
| Background: | Complete ELM suppression has been demonstrated in DIII-D over a substantial range of plasma conditions using the two-row I-coil applying n=3 fields. Attempts to suppress ELMs by single-row coil sets have been unsuccessful at DIII-D and elsewhere, but substantial ELM amplitude reduction was obtained at JET. ITER just chose a single-row ELM control coil. Single-row arrays produce large non-resonant helical harmonics that might non resonantly brake plasma rotation; this might bu undesirable. Because DIII-D has the world's most extensive experience with ELM suppression and the most extensive non axisymmetric coil sets, we should make a dedicated effort to see if we can get complete suppression at DIII-D. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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