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Magnetic feedback control was used in the DITE tokamak to reduce substantially saturated m = 2, n = 1 instabilities in both Ohmic discharges and discharges with Lower Hybrid Current Drive (LHCD). Feedback was used for the first time to increase significantly the disruptive density limit in a tokamak. LHCD on DITE stabilises the sawtooth instability but generates a large m = 1,2; n = 1 instability. Both components of this mode were controlled for the first time with feedback. Open loop experiments with LHCD show that mode locking occurs and allow detailed study of this phenomenon.

Additional information

Authors: MORRIS A W ET AL., UKAEA, Culham Laboratory, Abingdon, Oxon. (GB);ARSHAD S, University College, Oxford (GB);FISHPOOL G M, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: CLM-P867 EN (1990) 14 pp.
Availability: Available from the Librarian, UKAEA, Culham Laboratory, Abingdon, Oxon. OX14 3DB (GB)
Record Number: 199010830 / Last updated on: 1994-12-01
Original language: en
Available languages: en