DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 387: Chamber wall materials study | ||
| Name: | Clement Wong ( |
Affiliation: | General Atomics |
| Research Area: | Boundary | Presentation time: | Not requested | Co-Author(s): | D. Rudakov, P. West, W. Wampler, N. Ashikawa, R. Bastasz, J. Brooks, T. Evans |
| Description: | PSI of the chamber wall surface material of a tokamak has not been studied or measured in detail. This proposal is to study the plasma surface interaction of different relevant chamber surface materials, with special interest on the plasma discharges that would generate bursty radial transport of the plasma. | ||
| Experimental Approach/Plan: | We plan to use the MiMES material module to expose well characterized graphite buttons with coatings of W, B and Al, (Al is used to simulate Be), and possibly other materials, to study the effects of erosion, H/D pickup, and surface material damage from L-mode type of discharges. Similar material buttons will be exposed concurrently with the DiMES system. A dedicated 1/2 day experiment will be requested to acquire as much plasma exposure time as possible. | ||
| Background: | PSI of the chamber wall of a tokamak has not been studied or measured in detail. We need to understand, quantify and be able to model the effects, especially from the bursty radial transport of the plasma. The understanding of these effects is very significant simply due to the fact that the first wall chamber has a much larger surface area than the divertor. The first wall chamber PSI effects can also become the significant contributor of core impurities contribution. MiMES system was designed for the study such effects. Material buttons of different materials can be exposed to different plasma discharges to quantify the effects of material erosion, H/D pickup and material surface damage. MiMES material exposure can be complemented by similar material buttons exposure using the DiMES system. Direction comparison can then be made between the chamber and divertor areas. | ||
| Resource Requirements: | MiMES and DiMES systems and initiated with repeated L-mode discharges for as long as possible. | ||
| Diagnostic Requirements: | Chamber wall, divertor and core diagnostics. | ||
| Analysis Requirements: | Edge plasma characterization, and will then be supported by modeling studies. | ||
| Other Requirements: | -- | ||
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