DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 77: Dependence of the H-L transition on toroidal rotation | ||
| Name: | Punit Gohil ( |
Affiliation: | General Atomics |
| Research Area: | Transport | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | The LH transition has been determined to be sensitive to the edge toroidal rotation.The objective of this experiment is to determine the dependence of the back transition (H-L) to the edge toroidal rotation. This can be resolved by determining the power threshold for the back transition at various edge toroidal rotation values and plasma parameters, whilst examining the turbulence dynamics. | ||
| Experimental Approach/Plan: | Produce and maintain H-mode plasmas at different edge toroidal rotation values. Then decrease the input power at constant torque and observe the conditions at which the back transition to L-mode occurs. Focus all availabale turbulence dagnostics at the edge during these measurements. Repeat these scans for different plasma parameters and configurations to map out the operatinal space for the back transition. | ||
| Background: | Given the sensitivity of the H-mode transition to the edge toroidal rotation, an important issue for H-mode physics then becomes the dependence of the back transition (H-L) to the edge rotation and the determination of new key physics by observing the turbulnce dynamics across the back transition as a function of rotation. This is an especially important issue for ITER for which the conditions in which H-mode plasmas can be maintained at low toroidal rotation is now an open question. | ||
| Resource Requirements: | 4-5 co and 2 counter beams | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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