Proposal of Readout Electronics for CSNS-WNS BaF2 Detector

TL;DR

This paper presents a novel distributed readout electronics system for BaF2 detectors at CSNS-WNS, utilizing waveform digitizing at 1GSps and 12-bit resolution to enhance data acquisition accuracy and efficiency.

Contribution

It introduces a distributed architecture with PXIe crates and high-speed data transmission for BaF2 detector readout, improving data handling and synchronization.

Findings

Prototype achieved high performance in tests.

System effectively manages massive data readout.

Synchronization over high-precision network is successful.

Abstract

BaF2 (Barium fluoride) detector is one of the experiment facilities at the under construction CSNS-WNS (White Neutron Source at China Spallation Neutron Source). It is designed for precisely measuring (n,gamma) cross section with total 92 crystal elements and completely 4 pi steradian coverage. In this proposal for readout electronics, waveform digitizing technique with 1GSps sampling rate and 12-bit resolution is adopted to precisely capture the detector signal. To solve the problem of massive data readout and processing, the readout electronics system is designed into a distributed architecture with 4 PXIe crates. The digitized detector's signal is concentrated to PXIe crate controller through PCIe bus on backplane and transmitted to data acquisition system over Gigabit Ethernet in parallel. Besides, clock and trigger can be fanned out synchronously to each electronic channel over a high-precision distributing network. Test results showed that the prototype of the readout electronics system achieved good performance and cooperated well.