Design of Iter Neutron Flux Monitor System Back-End Electronics

The primary aim of the International Thermonuclear Experimental Reactor (ITER) Neutron Flux Monitor(NFM) system is to diagnose the neutron flux and fusion power of the plasma fusion reaction. The neutron flux is measured directly by the system and the fusion power could be calculated according the neutron flux result. The NFM system is divided into detectors and back-end electronics. This paper focus on the work of NFM#7 back-end electronics design and development. The back-end electronics consist mainly of four parts. First, the pre-amplifiers are used to charge integrate and amplify the signal of fission chambers. Second, the output of pre-amplifiers will be transmitted to Signal Processing Unit(SPU) for analog signal conditioning, data processing, and measurement result uploading. Third, the power supplies are low voltage power supply which provided for pre-amplifiers, and high voltage power supply which provided for fission chambers. Last, the Instrument and Control(I&C) is designed as the interface between NFM hardware and ITER central system, including the functions of configuration & control, monitoring, calibration, data communication & archiving and clock synchronization. The system design also follows the guidelines and standards of ITER