DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 292: ELM suppression with I-coil error correction | ||
| 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: | Use improved error correction to extend ELM-suppressed plasmas to lower rotation speeds. Demonstrate that ELMs can be suppressed by n=3 RMP, applied by the I-coil, while simultaneously applying the empirical n=1 error correction field, also with the I-coil. Optimize the error correction for the test plasma. Using best error correction, use counter injection to see how slow the plasma can go without problems. | ||
| Experimental Approach/Plan: | Set up the necessary special I-coil patch panel connection. Establish one of the RMP ELM-control test plasmas and verify ELM suppression using the normal I- and C-coil combination. This can be done with the special connection. Next, repeat the ELM suppression test while using the I-coil correction along with the RMP. If successful, optimize the I-coil n=1 error correction amplitude and toroidal phase for best plasma rotation. Finally, use NBI counter injection to reduce plasma rotation and see whether the ELM-suppressed plasma survives to lower rotation speeds than it does with C-coil error correction. | ||
| Background: | n=3 RMP ELM control experiments in DIII-D have been done with C-coil error correction, which is important. The I-coil does better error correction, at least in Ohmic, low density, locked mode test plasmas. An I-coil patch panel was developed in 2007 to permit both the n=3 RMP and the n=1 error correction currents to be supplied simultaneously and varied independently. | ||
| Resource Requirements: | Special patch panel connection of I-coil | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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