Update of the trigger system of the PandaX-II experiment

Understand

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.