DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 343: DiMES: Exposure of CVD diamond film | ||
| Name: | Steven Lisgo ( |
Affiliation: | UKAEA |
| Research Area: | Boundary | Presentation time: | Requested | Co-Author(s): | D. Rudakov |
| Description: | Expose a chemical vapour deposited (CVD) diamond coated molybdenum DiMES sample to a detached divertor plasma. | ||
| Experimental Approach/Plan: | Restore discharge 130122 @ 3.5 s: detached L-mode with the outer strike-point at the DiMES radius. It is important to start the strike-point significantly outside the DiMES radius and only move it inward once the plasma is detached, in order to avoid exposure of the sample to an attached plasma. | ||
| Background: | Recent advances in CVD methods and technology have allowed the production of relatively low cost polycrystalline diamond films. Diamond is an interesting candidate plasma facing material because of its high thermal conductivity and very low reactivity with hydrogen, i.e. chemical sputtering is nominal in laboratory hydrogenic plasmas. Unfortunately, it is also an electrical insulator in it's pure form and has a very low coefficient of thermal expansion, which are issues due to the potential for arcing and delamination, respectively. However, diamond may be a suitable strike-point material for a detached divertor, where the reduced plasma flux could mitigate these unfavourable properties. | ||
| Resource Requirements: | 0.5 day: diamond exposure to a detached plasma to test for arcing
0.5 day: same as above, but with Ar/Ne seeding to test for erosion | ||
| Diagnostic Requirements: | Langmuir probes near DiMES radius, tangential divertor cameras (Dalpha, Dgamma, CII and C III), divertor Thomson, DiMES TV, MDS (DiMES view). | ||
| Analysis Requirements: | None. | ||
| Other Requirements: | None. | ||
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