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Abstract

The vertical position of the JET plasma is unstable without feedback stabilization. The growth rate can reach 150 s**-1 for strongly elongated plasmas with elongation ratio b/a = 1.8. A failure of the stabilization at large plasma current (-5 MA) can cause damage to the vessel due to large vertical forces unless the plasma elongation ratio is limited or additional vessel supports are provided. The paper outlines the shape control system and discusses the vertical instability and its stabilization.

Additional information

Authors: NOLL P, JET JOINT UNDERTAKING, ABINGDON (UK);MAX-PLANCK- INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);AIGLE R, JET JOINT UNDERTAKING, ABINGDON (UK);MAX-PLANCK- INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);BROWNE M L, JET JOINT UNDERTAKING, ABINGDON (UK);MAX-PLANCK- INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);CORBYN D, JET JOINT UNDERTAKING, ABINGDON (UK);MAX-PLANCK- INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);ERIKSSON T, JET JOINT UNDERTAKING, ABINGDON (UK);MAX-PLANCK- INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);FROGER C, JET JOINT UNDERTAKING, ABINGDON (UK);MAX-PLANCK- INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);HUGUET M, JET JOINT UNDERTAKING, ABINGDON (UK);MAX-PLANCK- INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);REBUT P H, JET JOINT UNDERTAKING, ABINGDON (UK);MAX-PLANCK- INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);ET. AL, JET JOINT UNDERTAKING, ABINGDON (UK);MAX-PLANCK- INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);NIEDERMEYER H JET JOINT UNDERTAKING, ABINGDON (UK), JET JOINT UNDERTAKING, ABINGDON (UK);MAX-PLANCK- INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);MAX-PLANCK- INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY), JET JOINT UNDERTAKING, ABINGDON (UK);MAX-PLANCK- INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY)
Bibliographic Reference: 11TH SYMPOSIUM ON FUSION ENGINEERING, AUSTIN, TEXAS (USA), NOV. 18-22, 1985 PP. 3-1 - 3-9, WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON OX14 3EA (UK), MENTIONING REPORT JET-P(85)26, 1985
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