Power supply and protection system for plasma stabilisation in the ASDEX Upgrade tokamak

Author

Wieczorek, A. ; Blaumoser, M. ; Fink, R. ; Oswald, J. ; Schwarz, J. ; Vögtle, K.H.

Author_Institution

Max-Planck-Inst. fur Plasmaphys. (IPP), EURATOM, Garching, Germany

Volume

139

Issue

2

fYear

1992

fDate

3/1/1992 12:00:00 AM

Firstpage

131

Abstract

ASDEX Upgrade is a diverter-type tokamak commissioned in the spring of 1991 at IPP, Garching. The highly elongated plasma (elongation factor=1.6) requires a sophisticated plasma stabilisation system for both horizontal and vertical position control. A system of passive and active coils serves as a means of stabilising the plasma. The two active coils are powered by two 4-quadrant thyristor convertors at a power level of about 30 MVA. An exact model of the power supply system is used. A thyristor breaking system prevents the active coils from being overcharged by currents induced in the active coils in the event of a fast plasma disruption, where the plasma current of 2 MA decays within several milliseconds. A pyrobreaker serves as a back-up solution if the thyristor protection system fails

Keywords

Tokamak devices; fusion reactor theory and design; plasma toroidal confinement; power convertors; power supplies to apparatus; protection; thyristor applications; 30 MVA; 4-quadrant thyristor convertors; ASDEX Upgrade tokamak; active coils; elongated plasma; fast plasma disruption; horizontal position control; passive coils; plasma stabilisation; power supply system; protection system; pyrobreaker; thyristor breaking system; vertical position control;

fLanguage

English

Journal_Title

Electric Power Applications, IEE Proceedings B

Publisher

iet

ISSN

0143-7038

Type

jour

Filename

121775