DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 450: Search for a window of RWM instability at high rotation | ||
| Name: | Holger Reimerdes ( |
Affiliation: | Columbia University |
| Research Area: | RWM Physics | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | Analyze the rotation dependence of RWM stability and possible saturation mechanism at intermediate or high rotation values. | ||
| Experimental Approach/Plan: | We plan to carry out slow NBI torque ramp-downs starting with fast rotating plasmas with uni-directional NBI heating. The transport measurements can be supplemented with active MHD spectroscopy measurements, which should accelerate the rotation slow-down and indicate less stable regions. | ||
| Background: | Hu & Betti's kinetic calculations of RWM stability [Hu, Betti, PRL 2004] predict stability at low and no rotation, but instability at high rotation before shear-Alfven damping is thought to be effective [Reimerdes, et al, EPS 2007]. Such a region could be hard to detect since the growing RWM would greatly enhance the torque, decrease the plasma rotation and, thereby, stabilize the RWM again. It should however be detectable by a deterioration of momentum confinement at values of plasma rotation in the window of instability. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | Calculation of momentum confinement time. | ||
| Other Requirements: | -- | ||
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