The JA home team design of the ITER ECRF power supply system

This paper describes the JA home team design of the ITER ECRF power supply system whose capacity is 200 MVA. The system has 16 power supply units to d rive 68 gyrotrons with total radio frequency power of 68 MW for plasma heat ing, current drive and plasma start-up. Each unit drives gyrotrons with ene rgy recovery system to achieve higher than 50% of efficiency. The gyrotron fast protection system is based on a 70 kV, 100 A fast Insulated Gate Bipol ar Transistor (IGBT) switch composed of 70 IGBTs connected in series. The b reaking capability of this switch is 360 A with a protection time less than 10 mu s. The estimated short circuit energy, in case of load fault, is 0.2 6 joule which is far below the allowable energy of 10 joule. The main power supply output voltage control is done by a.c. thyristor voltage regulator with state feedback control and feedforward control of beam current and vol tage of the input a.c. line. In the layout design, the reduction of fire es calation risk is taken into account. The total space needed for the install ation is 35 m x 200 m for outdoor and 25 m x 90 m for indoor. (C) 1999 Else vier Science S.A. All rights reserved.