Engineering aspects of the ISTTOK operation in a multicycle alternating flat-top plasma current regime

Author

Fernandes, H. ; Varandas, C.A.F. ; Cabral, J.A.C. ; Figueiredo, H. ; Galvão, R. ; Batista, A.J.

Author_Institution

Centro de Fusao Nucl., Inst. Superior Tecnico, Lisbon, Portugal

Volume

1

fYear

1997

fDate

6-10 Oct 1997

Firstpage

576

Abstract

The main engineering aspects concerning the operation of the tokamak ISTTOK in a multicycle alternating flat-top plasma current regime are presented. AC discharges have been obtained feeding the ohmic and vertical field circuits with a power supply based on two capacitor banks and a fast Insulated Gate Bipolar Transistor (IGBT) H-bridge, feedback controlled by a discrete power DAC implemented with a set of IGBTs and resistors. The horizontal field Is created by a current provided by an independent DC power supply. The optimization of AC operation has also implied the installation of a new sat of windings for the vertical field and adequate gas puffing. Discharges with seven half-cycles flat-top plasma currents, in a total time span of about five times the maximum duration of a single DC discharge, were already achieved

Keywords

Tokamak devices; fusion reactor design; plasma toroidal confinement; power supplies to apparatus; AC discharges; AC operation; ISTTOK operation; engineering aspects; fast insulated gate bipolar transistor H-bridge; half-cycles flat-top plasma currents; multicycle alternating flat-top plasma current regime; single DC discharge; tokamak; Capacitors; Coils; Insulated gate bipolar transistors; Plasma confinement; Plasma density; Plasma temperature; Power supplies; Power transformer insulation; Resistors; Tokamaks;

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.1997.687106

Filename

687106