Integration and validation of LCU with different sub-systems for diacrode based amplifier

ITER-India as a domestic agency for the ITER project, is responsible to deliver one of the packages called ICH and CD Radio Frequency Power Sources (RFPS) to ITER system. Each power source is capable to deliver 2.5 MW at 35 to 65 MHz frequency range with a load condition up to VSWR 2:1 and any reflection coefficient of phase angle. Each source should be operated independently as well as in synchronization with central plant control system of ITER. For remote operation of different subsystems, like auxiliary power supply, high voltage power supply, low power RF system, Solid state power amplifier, Mismatched transmission line and 3MW-RF dummy load, Local Control Unit (LCU) is developed. LCU is developed using PXI hardware and Schneider PLC with LabVIEW-RT developmental environment. All the protection function of the amplifier is running on PXI 7841R module that ensures hard wired protection logic. There are three level of protection function- first power supply itself detects overcurrent/overvoltage and trips itself and generate trip signal for taking further action by protection function. There are some direct hardwired signal interfaces between power supplies (Anode trip to Screen Grid-off) to protect the amplifier. Second level of protection is generated through Command Control Embedded (CCE) against arc and Anode di/dt. Third level of Protection is through LCU where different fault signals are received and based on fault, off command of different sub-systems is generated within 1μs. Before connecting different subsystem with High power RF amplifiers (Driver and Final stage), each subsystem is individually tested through LCU. All protection functions are tested before hooking up the subsystems with main amplifier and initiating RF testing. The entire testing procedures and validation result, that was carried out by amplifier manufacturer along with ITER-India team during Site Acceptance Test of R and D amplifier will be discussed in this paper. (author)