DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 265: Poloidal rotation comparison between forward & reverse Ip | ||
| 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 in forward and reverse Ip conditions. One of the suggestions for the observed anomalous poloidal rotation is that it is caused by friction between the thermal ions and the fast beam driven ions, which follow the field line. | ||
| Experimental Approach/Plan: | A target discharge (probably standard ELMing H-mode) will be established in the usual Ip direction. For these experiments, balanced beams should be used, so that when Ip is reversed it does not alter the plasma rotation effects. A density scan should be performed since this is a key parameter for neoclassical poloidal rotation. The experiments will then be repeated in reverse Bt conditions, with matched shape and plasma profles. | ||
| Background: | A large discrepancy is observed between the experimentally observed poloidal rotation and the neoclassical prediction from NCLASS. This experiment allows testing one particular source for the anomaly. Some experimental data already exists that hints that this is not the dominant mechanism for the anomalous poloidal rotation, but a systematic comparison of co vs counter Ip is needed to definitively claim this. | ||
| Resource Requirements: | Machine Time: 2 half-day experiments
Number of neutral beam sources: 4 | ||
| Diagnostic Requirements: | CER, MSE | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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