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

Volume

1

fYear

1997

fDate

6-10 Oct 1997

Firstpage

539

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Fusion Engineering, 1997. 17th IEEE/NPSS Symposium

Conference_Location

San Diego, CA

Print_ISBN

0-7803-4226-7

Type

conf

DOI

10.1109/FUSION.1997.687097

Filename

687097