DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 364: Tungsten surface treatments for thermography | ||
| Name: | Charles Lasnier ( |
Affiliation: | Lawrence Livermore National Laboratory |
| Research Area: | Boundary | Presentation time: | Not requested | Co-Author(s): | West, Rudakov, Wong |
| Description: | Apply ELMing H-mode plasma to a DIMES sample containing tungsten buttons with different surface treatments. Observe the effect of plasma exposure on the emissivity. | ||
| Experimental Approach/Plan: | Insert the DIMES sample and sweep the strike point across DIMES while in lower single-null ELming H-mode. Use tungsten buttons that are variously polished, sandblasted, knurled, and castellated. | ||
| Background: | The infrared emissivity of tungsten varies greatly depending on surface conditions. This is of concern for a high-power tokamak using tungsten in the divertor, because thermography is needed to monitor the surface temperature. | ||
| Resource Requirements: | ELMing H-mode, beams | ||
| Diagnostic Requirements: | DIMES, IRTV viewing DIMES at high resolution | ||
| Analysis Requirements: | Process IRTV measurements and compare with DIMES thermocouple measurements, and between different tungsten buttons in the sample which started with different surface treatments. Perform surface analysis on the exposed tungsten to quantify the effect on the differently prepared surfaces. | ||
| Other Requirements: | -- | ||
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