DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 493: Does Intrinsic Rotation Depend on Beam Ions? | ||
| Name: | C. Craig Petty ( |
Affiliation: | General Atomics |
| Research Area: | Rotation Physics | Presentation time: | Not requested | Co-Author(s): | W. Solomon |
| Description: | Determine if and how the intrinsic rotation profile is related to the beam ion pressure profile for nearly balanced NBI discharges. Use the same technique to determine the intrinsic rotation profile as published by Solomon. Repeat this for plasmas with strong AE activity that redistributes the beam ions (as measured by FIDA and MSE) and for plasmas with no (or weak) AE activity. The AE activity can be varied by changing the NBI power and plasma density. | ||
| Experimental Approach/Plan: | (1) In medium to high density plasmas using the standard AT startup, inject ~1 co and ~1 counter beam with close to zero net torque. Verify that the AE activity is absence or weak. (2) Vary the co/counter beam mix to obtain rotation profile with both signs. (3) Lower the plasma density to get strong AE activity. Increase the NBI power if necessary to keep the global stored energy constant. (4) Repeat step (2). | ||
| Background: | Wayne Solomon has measured the intrinsic rotation profile by interpolating nearly balanced NBI dischagres to zero torque density at each radii. Since this intrinsic rotation appears to be greater than that measured by deGrassie using ECH, one may think that it is tied somehow to the beam ion pressure. | ||
| Resource Requirements: | At least two co sources (30LT and 330LT) and two counter sources. | ||
| Diagnostic Requirements: | CER, FIDA, MSE | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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