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Abstract

First "ergodic limiter" experiments on TEXTOR have shown that the external perturbation fields affect both the boundary region and the core. In particular, pronounced and stationary island structures in the boundary layer are observed. Internal MHD oscillations have been suppressed by rather low amplitudes of the magnetic perturbation field, an effect which may be desirable for extending the stability range of the plasma. In case that larger amplitudes of the perturbation field are applied, however, the global confinement is negatively affected. These negative side effects can be reduced or suppressed by a more elaborate arrangement of the external magnetic field coils; in any case larger devices permit a better separation between the desired perturbation of the plasma boundary and the undesired large amplitude perturbation of the plasma core. Both boundary and core effects will be subject of further experiments on TEXTOR.

Additional information

Authors: FUCHS G, INSTITUT FR PLASMAPHYSIK, KERNFORSCHUNGSANLAGE JUELICH GMBH;DIPPEL K H, INSTITUT FR PLASMAPHYSIK, KERNFORSCHUNGSANLAGE JUELICH GMBH;GIESEN B, INSTITUT FR PLASMAPHYSIK, KERNFORSCHUNGSANLAGE JUELICH GMBH;SCHOENGEN F, INSTITUT FR PLASMAPHYSIK, KERNFORSCHUNGSANLAGE JUELICH GMBH;WOLF G H, INSTITUT FR PLASMAPHYSIK, KERNFORSCHUNGSANLAGE JUELICH GMBH;TEXTOR, INSTITUT FR PLASMAPHYSIK, KERNFORSCHUNGSANLAGE JUELICH GMBH;TEAM INSTITUT FR PLASMAPHYSIK, KERNFORSCHUNGSANLAGE JUELICH GMBH, INSTITUT FR PLASMAPHYSIK, KERNFORSCHUNGSANLAGE JUELICH GMBH
Bibliographic Reference: 13. EUROPAEISCHE KONFERENZ DER EUROPAEISCHEN PLASMAPHYSIKALISCHEN GESELLSCHAFT, SCHLIERSEE (GERMANY), APRIL 14-18, 1986 1986, PP. 427-430
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