DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 474: L-H transition threshold with ECH induced H-modes | ||
| Name: | Edward Doyle ( |
Affiliation: | University of California, Los Angeles |
| Research Area: | Transport | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | Determine L-H transition power in RF generated H-mode plasmas for both directions of grad-B. Is the threshold power the same as in NBI-heated plasmas at low rotation? This is a critical question in understanding the ubiquity and signiificance of the 2007 observation that the power theshold with NBI heating is lower at low plasma rotation, and approximately equal for both directions of grad-B | ||
| Experimental Approach/Plan: | Utilise same plasma shapes as for 2007 NBI rotation studies, but replace NBI heating with ECH. Determine L-H transition power with ECH heating only, for both directions of grad-B. Use beam blips for diagnostic purposes. | ||
| Background: | The discovery that the L-H transition power threshold is lower at low rotation is one of the most significant results from the 2006/7 DIII-D run period. However, previously it was claimed that the power threshold for NBI and RF driven plasmas was similar. As RF driven plasmas have low rotation, are these two results contradictory? Given the gap in time since the previous RF driven L-h transition studies, the only way to address this is via new RF experiments. There are also implications for QH-mode operation and projections to ITER in resolving this issue. | ||
| Resource Requirements: | 5-6 gyrotrons. | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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