DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 84: Physics of n=3 nonresonant braking. Is there an unknown n=3 error field? | ||
| Name: | Gary Jackson ( |
Affiliation: | General Atomics |
| Research Area: | RWM Physics | Presentation time: | Not requested | Co-Author(s): | A. Garofalo, E. Strait,A. Cole, J. Callen, C. Hegna |
| Description: | Examine n=3 non resonant braking and its relation to NTV theory in discharges above and below the limit for rotational stabilization of RWMs. Quantify effect of varying n=3 phasing and examine the possibility of an n=3 error field. | ||
| Experimental Approach/Plan: | Starting with a high beta discharge, ramp an n=3 Icoil current. Do this for all parity and phases (4 discharges total). Repeat at low betaN.
Finally use a low betaN discharge (to avoid TM) and repeat with CTR beams and low rotation. | ||
| Background: | Recent results have shown that changing the PHASE, i.e. the current direction, in an n=3 Icoil configuration can have a dramatic effect on the toroidal plasma rotation. This can provide a tool to explore NTV theory for rotational braking and also to examine the possibility of an n=3 error field. The existence of the latter was suggested by analysis of two discharges, 127741 and 127846 where a best fit to the data required the addition of such a field. | ||
| Resource Requirements: | 0.5 day run time | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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