DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 92: External n=3 RMP for ITER ELM Control Tests | ||
| Name: | Max E. Fenstermacher ( |
Affiliation: | Lawrence Livermore National Laboratory |
| Research Area: | ELM Control & Pedestal Physics | Presentation time: | Not requested | Co-Author(s): | M.E. Fenstermacher |
| Description: | Use the C-coil configured for n=3 up to the maximum current capability to explore whether an external, single midplane row coil can suppress ELMs. | ||
| Experimental Approach/Plan: | Apply a high current, n=3 RMP from the C-coil to the same ITER Similar Shape plasma at the ITER collisionality and resonant q95=3.6 used for n=3 I-coil RMP ELM suppression experiments. Use the Icoil for optimum error field correction. If ELM suppression obtained, do C-Coil current scan to determine minimum required C-coil current for suppression. If suppression not obtained, do q95 scan at maximum C-coil current to look for resonance window. Include a power scan to determine if the C-coil perturbation changes the L-H power threshold. | ||
| Background: | The current decision by the ITER team is to explore the possibility of installing coils for ELM suppression in up to 14 of the 18 ITER port plugs on the outer midplane. Calculations have been done to estimate the required current to achieve Chirikov parameter greater than 1 into the same location (PsiN=0.85) as in successful DIII-D ELM suppression experiments with the n=3 I-coil. But no single row RMP experiment has obtained ELM suppression to date. When a combination of n=1 and n=3 was use with the C-coil previously (experiments by Evans) ELM suppression was not obtained and the L-H power threshold increased by a large factor (like 3 or more). We now have more current capability in the C-coil and we need to try one more time for ELM suppression with an external, single midplane row RMP coil. | ||
| Resource Requirements: | Same resources as used for 2007 ISS ELM control experiments, see for example shot 128374 etc. C-coil maximum current, I-coil for optimum error field correction, 5 co-beams. | ||
| Diagnostic Requirements: | All pedestal and lower divertor diagnostics, fast lower divertor IRTV would be highly desirable. | ||
| Analysis Requirements: | Control room island overlap analysis with SURFMN. If ELM suppression seen, post experiment field line trajectory analysis with TRIP3D and other 3D modeling. | ||
| Other Requirements: | -- | ||
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