DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2013 EXPERIMENTAL CAMPAIGN
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| Title | 126: Triggering ELMs at high frequency with PPPL Lithium granule injector | ||
| Name: | Dennis Mansfield dmansfie@pppl.gov | Affiliation: | Retired from PPPL |
| Research Area: | ELM Control | Presentation time: | Requested |
| Co-Author(s): | D. K. Mansfield, A. L. Roquemore, R. Maingi, G. Jackson, W. Wu, P. B. Parks, L. Baylor | ITPA Joint Experiment : | No |
| Description: | Use the PPPL Li granule injector to trigger and pace ELMs at high frequency (0-1000 Hz). Compare the results against D2 pellet pacing. | ITER IO Urgent Research Task : | No |
| Experimental Approach/Plan: | Perform a typical ELM-pacing experiment using plasma conditions and parameters similar to those that obtained during previous D2 pellet pacing discharges. Inject 1 mm Li granules at different velocities and at low frequency (say 45 m/s, 65 m/s and 85 m/s @ 30 Hz) and compare results. If needed, repeat the velocity scan for smaller granule size (1mm, 0.8 mm, 0.6 mm or 0.4 mm granules available). After establishing the optimum size and speed, inject at increasingly higher frequencies up to 1000 Hz or whatever frequency the plasma can tolerate. Some of this scanning work can be done during the same discharge because both the pacing frequency and the injection velocity can be swept independently in real time because of the nature of the injector design. | ||
| Background: | Recently the injection of Li granules was observed to trigger/pace ELMs on the EAST device in China. This work was accomplished with the PPPL Li granule injector. This observation allows one to contemplate pacing ELMs on ITER with Be or perhaps BeD2 granules. A better understanding of how metallic pellets trigger ELMs is needed before this could be undertaken. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | Similar / same as previous diagnostic coverage for D2 pellet pacing XPs. PPPL fast video camera required as part of injector hardware. | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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