DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 342: Formation and radial propagation of ELM filament structure in DIII-D | ||
| Name: | Lei Zeng ( |
Affiliation: | University of California, Los Angeles |
| Research Area: | ELM Control & Pedestal Physics | Presentation time: | Not requested | Co-Author(s): | UCLA group, D.L. Rudakov, J.A. Boedo, G.R. Mckee, M.E. Fenstermacher, M. Groth, C.J. Lasnier, P.B. Snyder |
| Description: | |||
| Experimental Approach/Plan: | It is important to generate ELMing (type I) plasma with large outer gap (>= 20 cm, as large as possible). Use fast profile reflectometer, BES, Langmuir probe, Thomson scattering and fast camera to measure ELM filament structure. And use FIR scattering and fluctuation reflectometer to monitor the density fluctuations during ELM. Scan Bt from 1.7 to 2.1 T. Scan line-average density. | ||
| Background: | The ELM filament structure has been observed in DIII-D , MAST and other devices. Thomson scattering in MAST shows a bump structure in the outboard edge density profile during an ELM event, directly resolving the filament structure in radius. In DIII-D, we have fast profile reflectometer measurement with >= 10 micro-sec time resolution which is good to track the density profile evolution associated with ELM. Although the measurement can not resolve non-monotonic density profile, a flat shoulder in the measured profile may indicate a bump structure existed. Also, other diagnostics in DIII-D such as Langmuir probe, TS, BES and fast camera can resolve the filament as well. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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