DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 93: Single Internal Row n=3 RMP for ELM Control | ||
| 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 single toroidal rows of the I-coil (upper and lower separately) configured for n=3 up to the maximum current capability to explore whether a nearby internal, single row coil can suppress ELMs. | ||
| Experimental Approach/Plan: | Apply a high current, n=3 RMP from the I-coil to the same ITER Similar Shape plasma at the ITER collisionality and resonant q95=3.6 used for dual row n=3 I-coil RMP ELM suppression experiments. Use the C-coil for optimum error field correction and possibly additional n=1 fields to fill-in the island spectrum. If ELM suppression obtained, do I-Coil current scan to determine minimum required I-coil current for suppression using a single row. If suppression not obtained, do q95 scan at maximum I-coil current to look for resonance window. | ||
| 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. Duing the dual row I-coil RMP ELM control experiments there were a few instances in which one of the rows did not come on (eg. 123300). The ELMs in these cases were changed but not suppressed. These cases were not in the ISS, nor at the maximum I-coil current capability or optimum plasma conditions. | ||
| Resource Requirements: | Same resources as used for 2007 ISS ELM control experiments, see for example shot 128374 etc. I-coil maximum current with C_suplies, C-coil for optimum error field correction, 5 co-beams. | ||
| Diagnostic Requirements: | All pedestal and lower divertor diagnostics. Fast divertor IRTV would be highly desireable. | ||
| 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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