DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 222: Reduced beta hybrid/AI plasmas and the transition to ELM-free VH-mode-like operation | ||
| Name: | Pete Politzer ( |
Affiliation: | General Atomics |
| Research Area: | Core Integration (Advanced Inductive) | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | Study the transition to ELM-free operation seen in hybrids as betaN is reduced. Determine whether the uncontrolled density increase due to excessive confinement (VH-mode) be avoided. | ||
| Experimental Approach/Plan: | By reducing beta in a hybrid discharge, the interval between ELMs becomes longer, until ELMs cease. Use various methods for spoiling confinement at the edge to avoid VH-mode like runaway and collapse. Possible methods using the I-coils are RMP stochasticization (may be less perturbing that ELM suppression) or n=0 oscillatory perturbation of the plasma surface. | ||
| Background: | This behavior was seen in beta scaling experiments. ELM-free hybrid operation, even at reduced beta, would be a very interesting regime. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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