DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 477: Dust Generation at Tile Leading Edges | ||
| Name: | Phil West ( |
Affiliation: | General Atomics |
| Research Area: | Boundary | Presentation time: | Not requested | Co-Author(s): | Dmitry Rudakov, Clement Wong |
| Description: | Use the DiMES leading edge sample to investigate the formation and transport of dust during intense plasma interaction at leading edges of tiles. The DiMES leading edge sample is designed to intercept parallel heat flux over a small region to simulate tile edges and other intense plasma-surface interaction zones. The sample is also designed to collect ablated material from the edge. In this experiment we would alos use the DiMES TV system to monitor the path of dust ejected into the divertor plasma and the Thomson scattering system to monitor dust transported to the divertor and SOL at 120° toroidal location. | ||
| Experimental Approach/Plan: | With DiMES retracgted prepare a standard lower single null discharge with DiMES in the private flux region. Sweep the OSP to DiMES for a prescribed length of time, roughly 1 second. Set gain and integration time for TV systems. After plasma is developed and diagnostic gains set (1-2 discharges) insert the DiMES probe with leading edge sample for 1-2 discharges. | ||
| Background: | Dust formation mechanisms in the tokamak are poorly documented. Data from DIII-D and other machines indicate that impulsive loading, such as ELMs and disruptions, are an important source of dust. Here we propose to examine the formation of dust at regions of intense plasma interaction over a longer duration of time. The previous work with the DiMES leading edge sample, massive amounts of ablated material was observed in the collection zone located under (away from the plasma) the interaction zone. The morphology of the collected material suggested that much of this material may have been ejected as dust. Here we propose to use the diagnostic techniques developed for monitoring dust to examine the dust ejected into the plasma. | ||
| Resource Requirements: | LSN, L-mode, ELMing H-mode
Normal Bt, Ip 1 to 4 beams | ||
| Diagnostic Requirements: | DiMES TV
Divertor and Core Thomson Lower Divertor Tangential TV IRTV Lower Langmuir Probes Bolometer SPRED CER | ||
| Analysis Requirements: | Standard Video analysis
Stasndard Thomson dust analysis Surface analysis | ||
| Other Requirements: | -- | ||
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