DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 160: Dependence of turbulence and transport on the safety factor and magnetic shear | ||
| Name: | Morgan Shafer ( |
Affiliation: | University of Wisconsin, Madison |
| Research Area: | Transport Model Validation | Presentation time: | Not requested | Co-Author(s): | G. McKee, D. Schlossberg, C. Holland |
| Description: | Characterize core turbulence parameters (i.e. fluctuation levels, radial correlation lengths, flows) vs. q, while profiles of other relevant dimensionless parameters (rho*, Te/Ti, nu*, etc. ) are kept nearly constant. Transport measurements will likewise be obtained. This data will contribute to the testing and validation of nonlinear simulations. | ||
| Experimental Approach/Plan: | Use L-Mode discharges. Keep non-dimensional parameters constant, while varying q_95. Repeat discharges needed for spatial BES and other fluctuation diagnostic scan. The number of BES channels will be increased from 32 to 48 to increase spatial coverage for turbulence and turbulence flow measurements. | ||
| Background: | Confinement is generally found to decrease at higher q. Likewise, previous evidence suggests that turbulence changes with q, and in particular the GAM amplitude is a strong function of q. Theoretical work has similarly shown a dependence of turbulence and transport on magnetic shear. A systematic scan of turbulence parameters is needed to characterize the dependence of turbulence and transport on both safety factor and magnetic shear. This data also contribute to the testing and validation of nonlinear turbulence simulations codes, i.e GYRO. | ||
| Resource Requirements: | Neutral Beams | ||
| Diagnostic Requirements: | BES, MSE, CER | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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