DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 60: Dependence of Stiffness on Elongation | ||
| Name: | C. Craig Petty ( |
Affiliation: | General Atomics |
| Research Area: | Transport Model Validation | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | Scan the temperature gradient at fixed density using a power scan to determine the stiffness of transport. Repeat this at various values of plasma elongation. Compare results with GYRO, TGLF, GLF23, and MM theory-based models. | ||
| Experimental Approach/Plan: | (1) Establish H-mode plasmas with density control. (2) Scan NBI power to vary the ion temperature gradient. (3) Try to maintain constant ExB shear and Ti/Te ratio. (4) Repeat NBI power scan at elongations between 1.5 and 2.0. | ||
| Background: | Confinement databases have not been able to clearly distingush between the GLF23 and Multimode theory-based models, probably because the most sensitive parameters are not clearly varied. Perhaps the largest difference between GLF23 and MM is the level of transport stiffness, especially in the outer regions of the plasma. In addition, these models have a very different elongation scaling of the stiffness value. Studying this experimentally should help us to validate (or disprove) these two theory-based models. | ||
| Resource Requirements: | NBI: At least 5 sources.
EC: Minimum 4 gyrotrons. | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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