DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 151: Test of Pellet Fueling Fast Transport Theory | ||
| Name: | Larry R. Baylor ( |
Affiliation: | Oak Ridge National Laboratory |
| Research Area: | General IP | Presentation time: | Requested | Co-Author(s): | P. Parks, T. Jernigan |
| Description: | An experiment is needed to better understand the physics mechanism for fast particle transport that occurs when pellets are injected. Much deeper particle deposition is observed with HFS pellet injection on DIII-D. This experiment will examine the scaling of this phenomenon with B,q,beta in order to compare with theory and extrapolate to ITER. | ||
| Experimental Approach/Plan: | Inject 1.8mm D2 pellets into otherwise steady L-mode and H-mode discharges with a scan of B,q while holding Beta and n relatively constant. Alternate the inner wall injection location (midplane and 45degree locations) and measure the density profile perturbations for the different pellets to determine the radial drift distance and the difference in deposition from the two inner wall locations. | ||
| Background: | Three theories or models have been proposed to explain this phenomenon based on ExB polarization drift and MHD pellet displacement. The MHD model proposed by Strauss has a local q dependence on the displacement that can be tested. Rational surfaces are also predicted to play a role in the Pegourie-Commaux model. This experiment should be done in concert with similar experiments in AUG and JET in order to maximize the scaling informatin obtained. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | Thompson Scattering
Fast Camera looking at inner wall Pellet Filterscope for cloud measurements | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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