DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 81: ECH assisted breakdown and startup for DIII-D and ITER | ||
| Name: | Gary Jackson ( |
Affiliation: | General Atomics |
| Research Area: | ITER Startup, Shutdown, Vertical Stability | Presentation time: | Requested | Co-Author(s): | -- |
| Description: | Use the DIII-D ECH capabilities to explore breakdown and burnthrough for ITER. In DIII-D, potentially produce a more reliable startup and possibly modify of early sawteeth and li | ||
| Experimental Approach/Plan: | 1. For ITER: Using large bore OWL startup (X2 resonance inside LCFS), demonstrate improvements in burnthrough with ECH. Most important data:
a. Vloop scan b. Bvf scan 2. For DIII-D optimize prefill, early gas, and Bvf and show effect on early MHD, including sawteeth, impurities, and current profile evolution. | ||
| Background: | DIII-D 2nd harmonic preionization experiments in 2006 and 2007 showed very interesting and sometimes counterintuitive results. For example best preionization was observed with the largest vertical field error and shortest connection length. In addition, after formation of the current channel, a large gas puff was required (0 to 50 ms) to keep dIp/dt positive.
In 2008 we propose experiments to validate the use of startup ECH for ITER, to further understand the breakdown and startup ECH physics, and to explore the use of ECH to improve DIII-D startup. | ||
| Resource Requirements: | 2 gyrotrons starting at t=-40 ms
Vloop feedback control (hasn't been used in many years) | ||
| Diagnostic Requirements: | Nothing new. Possibly configure visible camera to view tangentially beginning at t=-40 ms | ||
| Analysis Requirements: | Usual tools. Resurrecting MFIT, or possibly using JFIT, is desireable but not essential | ||
| Other Requirements: | -- | ||
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