DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 420: Rotation vs Ion Loss in L-H Transition Threshold | ||
| Name: | Mickey R. Wade ( |
Affiliation: | General Atomics |
| Research Area: | Transport | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | Utilize electron heating to discriminate the need for low rotation from that of increased ion loss at the edge. | ||
| Experimental Approach/Plan: | Using the discharge shape of previous L-H transition studies, measure the L-H transition power threshold in cases in which 2.5 MW of ECH is applied continuously. This would essentially repeat the previous scans of torque but with 2.5 MW ECH applied. The goal is to determine if the L-H power threshold dependence on the co/counter NBI balance is different when a significant amount of the power is from torque-free sources. | ||
| Background: | Measurements on DIII-D have shown a clear dependence of the L-H power threshold on the co/counter NBI balance. A key question is whether the reduced threshold power at near balanced NBI is due to low rotation or due to increased ion loss at the edge due to the counter injection. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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