DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 254: Rotation studies in the absence of Alfven Eigenmodes | ||
| Name: | Wayne M. Solomon ( |
Affiliation: | Princeton Plasma Physics Laboratory |
| Research Area: | Rotation Physics | Presentation time: | Not requested | Co-Author(s): | M.A. VanZeeland |
| Description: | Alfven eigenmode (AE) activity is believed to be capable of redistributing fast ion profiles through enhanced fast ion transport. This deviation from classical fast ion transport makes it more difficult to accurately compute the torque profile deposited by the neutral beams. Therefore, the goal is to study the rotation and associated momentum transport properties in plasmas with different levels of AE activity. | ||
| Experimental Approach/Plan: | Start with a plasma like #122116, with 1 net source where the AE activity is weak (can lower beam power if needed). Measure the rotation and momentum transport properties. Begin to introduce ECH power on axis, which should destablize AE's (probably RSAE's). Observe the change in rotation and deduce the altered NB torque profile through analysis. | ||
| Background: | Previous studies of the stabilization of RSAE's using ECH showed evidence of a redistribution of the fast ion by looking at the momentum channel. In particular, the total stored angular momentum was not changed (indicative of a redistibution as opposed to an outright loss), but the local rotation profile and associated inferred momentum diffusivity was changed. This could be attributed to a change in the torque source profile. | ||
| Resource Requirements: | Machine Time: 1/2 day Experiment
Number of neutral beam sources: 2 AMAP gyrotrons | ||
| Diagnostic Requirements: | CER, MSE | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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