Feedback stabilization of disruption precursors in a tokamak

Journal Article · Mon Mar 12 04:00:00 EST 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.64.1254· OSTI ID:6824480

Morris, A W; Hender, T C; Hugill, J; Haynes, P S; Johnson, P C; Lloyd, B; Robinson, D C; Silvester, C ^[1]; Arshad, S ^[2]; Fishpool, G M ^[3]

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1. Culham Laboratory,p EURATOM, United Kingdom Atomic Energy Authority Fusion Association, Abingdon, Oxon, OX143DB, United Kingdom (GB)
2. University College, University of Oxford, United Kingdom (GB)
3. JET Joint Undertaking, Abingdon, Oxon, OX143EA, United Kingdom (GB) Imperial College of Science, Technology, and Medicine, University of London, United Kingdom (GB)

Magnetic feedback control has been used in the DITE tokamak to substantially reduce saturated {ital m}=2, {ital n}=1 instabilities in both Ohmic discharges and discharges with lower hybrid current drive (LHCD). Feedback has been used for the first time to significantly increase the disruptive density limit in a tokamak. LHCD on DITE stabilizes the sawtooth instability but generates a large {ital m}=1,2, {ital n}=1 instability. Both components of this mode have been controlled for the first time with feedback. Open loop experiments with LHCD show that mode locking occurs and allow detailed study of this phenomenon.

• OSTI ID: 6824480
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 64:11; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
CLOSED PLASMA DEVICES
CONTROL
ELECTRIC COILS
ELECTRICAL EQUIPMENT
ENERGY LOSSES
EQUIPMENT
FEEDBACK
INSTABILITY
LOSSES
MAGNET COILS
MAGNETIC FLUX
OPTIMIZATION
OSCILLATION MODES
PLASMA DISRUPTION
PLASMA INSTABILITY
THERMONUCLEAR DEVICES
TOKAMAK DEVICES