DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2013 EXPERIMENTAL CAMPAIGN
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| Title | 214: Density (Greenwald) Limit and the Radiation Driven Islands | ||
| Name: | Egemen Kolemen ekolemen@pppl.gov | Affiliation: | Princeton Plasma Physics Laboratory |
| Research Area: | Torkil Jensen Award | Presentation time: | Requested |
| Co-Author(s): | D. Gates, L. Delgado-Aparicio, E. Hollman, J. Ferron, M. Van Zeeland, N. Commaux, B. Tobias, B. Grierson | ITPA Joint Experiment : | No |
| Description: | A new theoretical model for the Greenwald Limit has been proposed that appears to be consistent with experimental observations based on radiation driven islands [D. A. Gates, L. Delgado-Aparicio, "On the origin of tokamak density limit scalings", PRL]. We propose to study and test this theory at DIII-D. | ITER IO Urgent Research Task : | No |
| Experimental Approach/Plan: | One prediction of this theory is that direct heating of the rational surfaces that participate in the radiation driven island phenomena should suppress these islands and pass the density threshold, since this would avoid the shielding process described above.
1. Vary the heating power and location, and measure the island size and radiation a. Run at ECH cut-off density meets Greenwald density limit (~1 MA, 2 T). b. Measure the radiated power from the island to see if the theory predicted power balance criteria is met: High-resolution bolometer for time-resolved profiles of the radiated power density c. Use ECE-I, visible cameras, and MRI to get never before collected data at the density limit to understand the underlying physics of the density limit disruptions. Study the island formation process at different rational surfaces. Note that for high resolution visible camera working at high density will enable good measurements. 2. Seed different impurities (e.g. Argon) a. This will give us better measurement of the island b. Give more information on how the radiation from different species effect the island growth. 3. Look at the effect of heating additional surfaces if the ECH increases the limit. | ||
| Background: | -- | ||
| Resource Requirements: | 1 day. | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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