Data Acquisition System for ITER Neutron Diagnostic Divertor Neutron Flux Monitor

Abstract

Neutron diagnostic “Divertor Neutron Flux Monitor” is being under the development for the ITER project. This diagnostic is a primary tool for total neutron yield and fusion power measurements. Diagnostic consists of the three detector modules and the enhanced data acquisition (DAQ) systems. Each module contains three fission chambers (FCs) with 235U and three with 238U. The choice of the FC types and sensitivities is determined by the project requirements for the neutron flux measurement range, error, and time resolution. The DAQ system performs preliminary amplification and processing of the fission chamber signals, and the calculation of the neutron flux at the module location to calculate the total neutron yield and fusion power. The DAQ system transfers measured data to the upper level of the control system with a time resolution of 1 ms and provides raw data archiving. The hardware and software of the DAQ system were developed taking into account the requirements of the ITER project. The data processing system mockup of a single detection module was manufactured. This mockup passed laboratory and reactor tests. The system has passed the preliminary design approval. Preparation for the manufacturing of the system prototype is carried out at this moment. The architecture of the DAQ system and its components are shown in the report, and the test results of the system mockup are discussed.