DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 256: Turbulence characteristics in edge pedestal and its correlation with pedestal structure evolution from L-H transition to the first ELM | ||
| Name: | Guiding Wang ( |
Affiliation: | University of California, Los Angeles |
| Research Area: | ELM Control & Pedestal Physics | Presentation time: | Not requested | Co-Author(s): | UCLA group |
| Description: | The purpose is to obtain turbulence characteristics (fluctuation level and radial correlation length) in edge pedestal and its correlation with pedestal structure evolution from L-H transition to the first ELM utilizing multi-channel correlation/Doppler reflectometer, addressing issues like how turbulent transport in the pedestal is related to the pedestal structure (height/width). | ||
| Experimental Approach/Plan: | Make clean L-H transition and a fairly long ELM-free H-mode (~ several hundred milliseconds) before a first ELM occurs. During the phase from L-H transition to the first ELM, try to avoid MHD activities, keep density pedestal height controlled at given magnetic field so that multi-channel correlation/Doppler reflectometer can access the whole pedestal region. Perform collisionality or power scan to change ELM types. | ||
| Background: | Underlying physics that sets the H-mode edge pedestal width, height, stability, transport, etc is yet to be explored. Multi-channel correlation/Doppler reflectometer is providing a new capability for measuring turbulence characteristics (fluctuation level and radial correlation length) in the pedestal, potentially addressing some important issues like how turbulent transport in the pedestal is related to the pedestal structure. Due to the limited accessible density range of the reflectometer system, dedicated experiments are required for a full coverage of the edge pedestal. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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