DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 261: Poloidal rotation comparison between forward & reverse Bt | ||
| Name: | Wayne M. Solomon ( |
Affiliation: | Princeton Plasma Physics Laboratory |
| Research Area: | Transport | Presentation time: | Not requested | Co-Author(s): | K.H. Burrell, M. Zarnstorff, W. Houlberg |
| Description: | The purpose of this experiment is to compare the inferred poloidal rotation profiles with forward and reverse Bt in otherwise matched discharges. From a symmetry point of view, the radial electric field may be expected to be unchanged. As such, the poloidal rotation must flip signs (to keep the Vpol*Btor contribution to Er the same). | ||
| Experimental Approach/Plan: | A target discharge (probably standard ELMing H-mode) will be established in the usual Bt direction. For these experiments, the toroidal rotation should be kept low by use of balanced beam injection, to minimize the toroidal rotation contribution to Er (as well as reducing toroidal pickup on the vertical chords). MSE will be used as an independent check on the Er profile, and BES and reflectometer measurements will allow indirect evaluation of Er by looking at the poloidal propagation velocity of the turbulence. Power scans at fixed torque and density scans will be performed. The experiments will then be repeated in reverse Bt conditions. The MSE, reflectometer and BES will provide checks that the Er is indeed unchanged in the reverse Bt conditions. | ||
| Background: | Inference of poloidal rotation from CER measurements is complicated by various atomic physics effects. While tests have been made to check the validity of the analysis techniques, further tests are highly desirable. | ||
| Resource Requirements: | Machine Time: 2 half-day experiments
Number of neutral beam sources: 6 | ||
| Diagnostic Requirements: | CER, MSE, reflectometer, BES | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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