Title :
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
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;
Conference_Titel :
Fusion Engineering, 1997. 17th IEEE/NPSS Symposium
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-4226-7
DOI :
10.1109/FUSION.1997.687106
