DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 274: Edge current measurement | ||
| Name: | Phil Snyder ( |
Affiliation: | General Atomics |
| Research Area: | ELM Control & Pedestal Physics | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | The edge current profile is very important both for conventional models of edge stability (peeling-ballooning) and for micro-instabilities in the edge (strong dependence on local magnetic shear). Measurements of the edge current using the lithium beam have been very useful in the past, though long time windows have been needed for this analysis. The (possible?) availability of a dual MSE system creates an opportunity to measure this highly important quantity with a different technique. | ||
| Experimental Approach/Plan: | Create diagnostic optimized plasmas, with low density and very high expected bootstrap current, as well as a long ELM-free period and long ELM periods. Look also at high collisionality plasmas to investigate expected reduction of Jbs. Allow time for whatever diagnostic testing and calibration is needed. | ||
| Background: | -- | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | This expt ought to be done early in the year to develop edge current measurements, so that they can be usefully employed in later expts. Measuring the edge current is very useful in essentially all pedestal and ELM expts. | ||
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