Development of a readout system employing high-speed network for J-PARC

An electronics system employing a high-speed network for the readout of linear position-sensitive 3He gas detector (PSD) has been developed at KEK. It will be widely used in neutron scattering instruments at the Material and Life Science Facility at Japan Proton Accelerator Research Complex (J-PARC). This system consists of a new neutron encode—(NEUNET) module and a large-scale data acquisition (DAQ) system. The NEUNET module has not only the previous present histogram mode but also the event mode that allows offline-analysis after experiments. The module has a high-speed network (SiTCP), which introduces the flexibility and the scalability to the DAQ system. The NEUNET module is based on a Versa module Europe (VME) system; it converts PSD signals to digital data by front-end ADCs and transmits the data to the DAQ system that stores them in large storage spaces. We perform a preliminary experiment using the NEUNET modules and the DAQ system at Japan Research Reactor No. 3 at JAEA. Five NEUNET modules process the data of forty PSDs. This paper reports on the details of the NEUNET module and the event mode.