DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 252: Test of toroidal momentum pinch model | ||
| Name: | Wayne M. Solomon ( |
Affiliation: | Princeton Plasma Physics Laboratory |
| Research Area: | Rotation Physics | Presentation time: | Not requested | Co-Author(s): | T.S. Hahm, P.H. Diamond, K.H. Burrell |
| Description: | Some experimental evidence has been produced to show that simple diffusion of momentum is not sufficient to explain momentum transport. Theoretical models exists to describe sources of momentum pinch. This experiment aims to test the recent theory of Hahm (PoP 2007), which predicts that the momentum pinch velocity should scale as chi_phi/R, where chi_phi is the momentum diffusivity. | ||
| Experimental Approach/Plan: | Study a range of plasmas, from L-mode (where chi_phi tends to be particularly large, to H-mode and ITBs (where chi_phi tends to be reduced). Looking at high and low rotation cases will also be useful, since measurements have indicated that chi_phi ~ chi_i at large rotation, but this coupling appears to be lost at low rotation. | ||
| Background: | Preliminary momentum perturbation experiments on DIII-D and NSTX have shown the existence of a momentum pinch. The exact form of this pinch needs to be experimentally verified. | ||
| Resource Requirements: | Machine Time: 1 day Experiment
Number of neutral beam sources: 6 | ||
| Diagnostic Requirements: | CER | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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