DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 235: nu-star scan for transport validation studies | ||
| Name: | Christopher Holland ( |
Affiliation: | University of California, San Diego |
| Research Area: | Transport Model Validation | Presentation time: | Requested | Co-Author(s): | G. R. Tynan, G. R. McKee, M. W. Shafer, A. E. White, T. Rhodes, J. DeBoo, R. Prater, G. Staebler, J. Kinsey, R. E. Waltz, J. Candy |
| Description: | The goal of this experiment would be to carry out a nu-star scaling study, to validate gyrokinetic simulations of in plasmas with varying collisionality. In contrast from usual scaling studies, we would want to push nu_star down rather than up. | ||
| Experimental Approach/Plan: | TBD. Basic idea is to scan nu-star (using a reference point at r/a=0.5-0.6) downwards, while holding rest of plasma as constant as feasible. For each value of nu-star, carry out multiple repeat discharges to obtain radial profiles of ne and Te fluctuations. Up-down symmetric plasmas would be preferable | ||
| Background: | One of the largest challenges for current gyrokinetic transport simulations of L-mode plasmas (which provide the largest fluctuation levels to compare against) is the relatively large value of nu-star relative to linear growth rates, particularly at larger radii. In order to better accurately characterize the performance of the codes, carrying out a nu-star scan to facilitate validation studies would be extremely helpful. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | complete profile and fluctuation measurements | ||
| Analysis Requirements: | TGLF/GYRO/fluctuation and transport analysis | ||
| Other Requirements: | -- | ||
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