DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 32: Multiple n dynamic error field correction | ||
| Name: | Holger Reimerdes ( |
Affiliation: | Columbia University |
| Research Area: | RWM Physics | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | Attempt to improve error field correction in high beta plasmas using dynamic error field correction with independently controlled I-coils. | ||
| Experimental Approach/Plan: | The target plasma must be a high beta plasma where beta exceeds the n=2 no wall stability limit. In order to be able to control multiple n modes the I-coil must be independently controlled. A maximum current of up to 1.7 kA can be achieved by using a sub-SPA on each I-coil. The current will be chosen to cancel the radial field (total or plasma response) at the corresponding radial field sensor. The correction will be evaluated by observing changes to the plasma rotation assuming that an axisymmetric configuration results in the least drag. | ||
| Background: | RWM feedback control and simultaneous error field correction of multiple n is expected to lead to the most stringent requirements on the DIII-D RWM feedback system and will, possibly, require a further upgrade of the amplifier system (as described in the DIII-D 5-year plan). This experiment examines the required magnitude of DC error field correction currents. | ||
| Resource Requirements: | Sub-SPAs on individual I-coils. Minor modifications of PCS input channels. | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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