DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
Login | Review | Submit | Logout | Help
Questions about this website? Contact Andrew LeBlanc Questions about ROF? Contact Chuck Greenfield
| Title | 253: Main ion rotation studies | ||
| Name: | Wayne M. Solomon ( |
Affiliation: | Princeton Plasma Physics Laboratory |
| Research Area: | Rotation Physics | Presentation time: | Not requested | Co-Author(s): | K.H. Burrell |
| Description: | Typically, the plasma rotation is determined indirectly through measurements of an impurity species such as carbon. Although neoclassical calculations exist to compute the main ion rotation based on impurity measurements by imposing radial force balance, there have been several indications that this approach may not always be applicable. | ||
| Experimental Approach/Plan: | This experiment requires helium plasmas, so that main ion CER measurements can be made. Repeat shots will be taken, with the CER set to impurity carbon and main ion He for comparison. Both toroidal and poloidal rotation measurements will be useful as independent checks. Scans of the ion temperature and density gradients should be made (since these are the neoclassically relevant quantities for converting rotation between different species). It would also be worthwhile to do this at several basline rotation/torque values (so as to isolate potential systematic charge exchange cross-section effects). | ||
| Background: | Measurements of the impurity poloidal rotation has been found to differ from neoclassical predictions under some circumstances. Likewise, there have been cases of disagreement between the toroidal rotation observed between the main ion (He) and impurity different than the correction supplied by neoclassical theory. Establishing the conditions for which we may rely on neoclassical theory to tell us about the main ion rotation is clearly an important issue. | ||
| Resource Requirements: | Machine Time: 1 day Experiment
Number of neutral beam sources: 6 | ||
| Diagnostic Requirements: | CER | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
Print this page