Update of the trigger system of the PandaX-II experiment

TL;DR

This paper presents an upgraded FPGA-based trigger system for the PandaX-II dark matter experiment, replacing the previous analog system to improve data acquisition efficiency and performance.

Contribution

The paper introduces a novel FPGA-based trigger system and algorithms, enhancing the data acquisition process of the PandaX-II experiment.

Findings

The FPGA-based trigger system performs reliably on real data.

It improves the efficiency of data collection in the PandaX-II experiment.

The system design allows for flexible trigger algorithms.

Abstract

PandaX-II experiment is a dark matter direct detection experiment using about half-ton of liquid xenon as the sensitive target. The electrical pulses detected by photomultiplier tubes from scintillation photons of xenon are recorded by waveform digitizers. The data acquisition of Pandax-II relies on a trigger system that generates common trigger signals for all waveform digitizers. Previously an analog device-based trigger system was used for the data acquisition system. In this paper we present a new FPGA-based trigger system. The design of this system and trigger algorithms are described. The performance of this system on real data is presented.