DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 377: Beta limits for 3/2 NTM onset and locking, as a function of rotation | ||
| Name: | Francesco Volpe ( |
Affiliation: | ORAU |
| Research Area: | Rotation Physics | Presentation time: | Requested | Co-Author(s): | -- |
| Description: | Characterize 3/2 onset and locking (and compare with 2/1) by means of beta ramp and torque scan | ||
| Experimental Approach/Plan: | Ramp NBI power at fixed co/ctr mix in hybrid discharges until 3/2 forms and, eventually, locks. Repeat for various co/ctr mix. | ||
| Background: | The background of this proposal is twofold and related to two experimental observations from the last campaign.
On one hand, it will help to better understand the conditions for the onset of the 3/2 mode and -in combination with measurements by R.Buttery et al. for the 2/1 mode- will help to understand when to expect a 3/2 or a 2/1 mode. In turn, this might explain recent difficulties in reproducing earlier hybrid discharges, where 2/1 modes were obtained instead of 3/2. A possible explanation is that different beta thresholds apply to the two modes at different rotation velocities. What threshold a beta ramp hits first (thus, which NTM appears first), it depends on the rotation. On the other hand, this study will also help to characterize the 3/2 mode locking, recently observed at DIII-D for the first time and experimentally determine its ITER relevance. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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