DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 341: Investigation of edge ne profile, fluctuations, and particle transport during RMP | ||
| Name: | Lei Zeng ( |
Affiliation: | University of California, Los Angeles |
| Research Area: | ELM Control & Pedestal Physics | Presentation time: | Not requested | Co-Author(s): | T.E. Evans, R.A. Moyer, M.E. Fenstermacher, and UCLA group |
| Description: | The goal of this experiment is to investigate the edge density and fluctuations by reflectometers and turbulence measurements for different RMP amplitudes during ELM suppression phase in the low collisionality plasma, and compare to the theoretical models. | ||
| Experimental Approach/Plan: | Setup low collisionality ELM suppressed operation. For I-coil current scan, or different current, measure edge density profile via profile reflectometer, density fluctuations via FIR, correlation reflectometer, Doppler reflectometer, BES and Langmuir probe, Te fluctuation from CECE. Also, measure the Er from CER. Compare ne values at separatrix and top of pedestal, and others to the prediction from Tokar model. Study the mechanism of particle transport, ExB convection or charged particle flow. | ||
| Background: | Although ELM has been successfully suppressed by using a stochastic magnetic boundary which is generated by I-coil, the mechanism of particle and thermo transports is not very clear. It is believed that particle transport in low collisionality is possibly caused by ExB convection during ELM suppression. Currently, Tokar model shows particle transport is due to charged particle flow, and thermo transport is interpreted by the reduction of perpendicular neoclassical transport with decreasing density and nonlocality of parallel heat transport. In DIII-D, the advanced turbulence and profile measurements are good to test the model and mechanisms. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | turbulence measurements and reflectometer | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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