DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 417: Injection of pre-characterized dust in using DiMES | ||
| Name: | Dmitry Rudakov ( |
Affiliation: | University of California, San Diego |
| Research Area: | Boundary | Presentation time: | Not requested | Co-Author(s): | P. West, C. Wong, J. Yu, M. Groth, B. Bray, N. Brooks, C. Lasnier, M. Fenstermacher, A. Pigarov, R. Smirnov, W. Solomon |
| Description: | Injection of pre-characterized graphite, diamond and boron dust in the lower divertor of DIII-D using DiMES. The objectives are: 1) study dust dynamics and migration in a tokamak; 2) benchmark DustT modeling, 3) calibrate cameras and Thomson scattering with known size dust | ||
| Experimental Approach/Plan: | Load well-defined size and composition dust into DiMES holder. Expose dust to LSN plasma discharges with strike point sweeps. Observe dust injection with available diagnostics (cameras, Thomson scattering, spectroscopy). Can be performed as piggyback on LSN cleaning discharges following maintenance periods. | ||
| Background: | A few dust injections in the lower divertor of DIII-D using DiMES have been previously performed. Dust used in those experiments was graphite dust with 6 micron median diameter and significant size spread (from sub-micron to over 10 micron). We have now obtained diamond dust with very uniform size in a few ranges (1-2 micron, 2-4 micron, etc.). Such dust would be useful to calibrate cameras, since it is generally very hard to deduce the dust size from camera images. Nanometer size carbon dust that could be used to calibrate Thomson scattering measurements is also available. Boron dust can be used to benchmark DustT modeling of different chemical composition dusts. | ||
| Resource Requirements: | 2-3 shot experiments: 1 setup shot, 1 reference shot (could be same shot as setup) + 1 injection shot. LSN patch panel, strike point sweeps. | ||
| Diagnostic Requirements: | DiMES, DiMES TV, lower divertor tangential TVs, UCSD fast camera, CER, Thomson (divertor and core), filterscopes, MDS, lower divertor Langmuir probes, SPRED | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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