DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 187: Stability control and disruption avoidance: initial demonstration of an integrated approach | ||
| Name: | Ted Strait ( |
Affiliation: | General Atomics |
| Research Area: | Disruptions | Presentation time: | Requested | Co-Author(s): | J. Wesley |
| Description: | The goal of this experiment is to use existing capabilities for a first, simple demonstration of an integrated, multi-layer approach to stability control and disruption avoidance:
- NTM suppression with ECCD - remedial action if ECCD suppression fails - mitigation of an impending disruption | ||
| Experimental Approach/Plan: | - Establish a plasma in which the NTM is avoided by pre-emptive ECCD at the q=2 surface.
- Use the dud detector to reduce the beam power if an n=1 rotating mode appears. Demonstrate this during programmed or unprogrammed reductions of ECCD power. - Configure the dud detector to trigger massive gas injection if the rotating n=1 mode locks. If such events do not occur naturally, induce them by adjusting the NB power in the dud phase. Much of this experiment could be done in combination with an experiment on ECCD stabilization of the 2/1 NTM. The final step of applying MGI might need some dedicated shots, though the gas species and quantity could be selected for minimum after-effects. | ||
| Background: | An integrated system for stability control and disruption avoidance is crucial for ITER, and is an important element of the next DIII-D five-year plan. This experiment combines several of the building blocks of such an integrated system, and should provide a foundation on which additional features can be added. | ||
| Resource Requirements: | PCS programming is needed before the experiment. | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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