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For fast correction of the horizontal position of plasma in TEXTOR a newly designed power system has been set up. The existing four-quadrant chopper amplifier with forced commutated thyristors as switches has been replaced by four-quadrant power supplies with bipolar transistors as switches. By this transistor "switch-mode" technology a doubling of the correction field has been achieved, and also a remarkable improvement in the dynamic behaviour of the horizontal plasma position control loop. Even with abrupt disturbances (sudden introduction or withdrawal of additional heating power as ICRH and/or NBI of 6 MW), the plasma can be maintained within a few millimetres. In addition, with the consistent use of modular technology, the availability has been improved considerably. Operation has shown that even with failure of one subsystem, plasma disruptions can still be avoided. Much greater initial currents are feasible, although the voltage is limited to about 600 V due to the transistors available at present.

Additional information

Authors: GIESEN B, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE);HÜTTEMANN P, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE);KRÖNER K, AMK GmbH, Kircheim-Teck (DE);SCHALT W, Zentrallabor für Elektronik (DE);SEEGER A, Zentrallabor für Elektronik (DE);STEINHAUSER K, Haußmann Industrieelektronik, Nürtingen (DE);HUTTEMANN P, Institut fur Plasmaphysik, Kernforschungsanlage Julich GmbH, Julich (DE)
Bibliographic Reference: Article: Fusion Technology 1990, Vol. 2 (1991) pp. 1525-1529
Record Number: 199111186 / Last updated on: 1994-12-02
Original language: en
Available languages: en