DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 201: Improvement of Dynamic Error Filed Correction by Active MHD Spectroscopy approach in closed feedback | ||
| Name: | Michio Okabayashi ( |
Affiliation: | Princeton Plasma Physics Laboratory |
| Research Area: | Error Fields | Presentation time: | Not requested | Co-Author(s): | A. Garofalo, Yongkyoon In, G. Jackson, R. LaHaye, H. Reimerdes, Ted Strait, H. Takahashi |
| Description: | In the 2007 campaign, we have shown that a simple model of dynamic error field correction iteration process can describe the experimental observations in a satisfactory manner.
The Dynamic Error Filed Correction (DEFC) approach is a power tool to minimize the resonant error field component and to improve the macro MHD activity. It is very attractive if the approach is extended to C_beta ~ 0 regime where many AT discharges have to go though in time for achieving higher betan conditions. The RFA is expected to be weak at C_beta ~ 0, however, the lower rotation may enhance the amplification as if a singularity. The challenging part is to evaluate the plasma response and to set the complex gain in PCS system. Here, it is proposed to determine the plasma response by using the Active MHD spectroscopy approach in closed feednback system mode. | ||
| Experimental Approach/Plan: | Approach
(1) To prepare the Active MHD spectroscopy technique along with closed feedback option (2) To document the closed loop performance at various frequencies. (3) To predicts the maximum gain in the PCS system for DEFC, including the possibility of complex gain setting (4) To verify the predicted performance and improve the process | ||
| Background: | -- | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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