Title :
Plasma vertical stabilisation at JET using adaptive gain adjustment
Author :
Lennholm, M. ; Campbell, D. ; Milani, F. ; Puppin, S. ; Sartori, F. ; Tubbing, B.
Author_Institution :
JET Joint Undertaking, Abingdon, UK
Abstract :
The plasma vertical position at JET is stabilised using the Fast Radial Field Amplifier (FRFA). This amplifier applies voltage to the radial field coils in steps of 2.5 kV from -10 kV to 10 kV. It has a maximum current capability of 2.5 kA. The amplifier is controlled in a closed loop by the Vertical Stabilisation controller. The best settings of the gains in this controller depend on the plasma growth rate, which varies in an unpredictable manner during a JET pulse. An adaptive control algorithm based on measurements of the switching activity of the FRFA amplifier is used to adjust these settings in real time
Keywords :
Tokamak devices; adaptive control; closed loop systems; fusion reactor design; physical instrumentation control; position control; Fast Radial Field Amplifier; JET; adaptive control algorithm; adaptive gain adjustment; closed loop; maximum current capability; plasma growth rate; plasma vertical stabilisation; radial field coils; switching activity; Adaptive control; Coils; Control systems; Equations; Magnetic variables measurement; Plasma measurements; Pulse amplifiers; Shape; Velocity control; Voltage control;
Conference_Titel :
Fusion Engineering, 1997. 17th IEEE/NPSS Symposium
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-4226-7
DOI :
10.1109/FUSION.1997.687097
