Design of prototype readout electronics system for gamma-gamma collider

Abstract

The γγ collider is proposed in China to observe γγ scattering and the Breit Wheeler (BW) pairs production.This paper presents a prototype readout electronics system that is intended to provide a suitable readout solution for the γγ collider. The paper analyzes the readout requirements of electronics such as implementation of 1426 electronical channels in a limited space, stability in vacuum working environment and incident particle discrimination. To meet the requirements, the paper proposes a high-density, low-power and high-sampling-rate (1 GHz) prototype readout electronics system using waveform digitization technology based on switch capacitor array (SCA) DRS4 chips and analog-to-digital converters (ADC). The prototype readout system is composed of 8 front-end electronics (FEE) boards and a data acquisition (DAQ) board. The FEE board can digitize 180-channel signals from the collider and send packaged data to the DAQ board via high-speed optical fiber. The paper proves the particle discrimination ability and the stability of the prototype electronics system in the joint-test with other detectors, which provides a strong guarantee for the subsequent development of the γγ collider.