LUX-ZEPLIN (LZ) Data Acquisition and Sparsification System

The LUX-ZEPLIN Data Acquisition and Sparsification System has been deployed at the Sanford Underground Research Facility (SURF) and is successfully collecting data from 1395 photomultiplier and auxiliary signal channels. The photomultiplier signals are passed through dual-gain amplifiers and captured using custom built, 32-channel, FPGA-based digital signal processors. The appropriately conditioned signals are digitized at 100 MHz sampling frequency with 14-bit resolution. The digital filters that are used for data selection operate with an aggregate throughput in excess of 595,000 MB/s. The data sparsification parameters for triggering on the small amounts of photoluminescence S2 light have been optimized. The real-time DAQScope functionality and continuous, acquisition independent, monitoring of digital filter crossing rates have proven to be invaluable in the commissioning of the LZ detector. In this talk, I will present our initial experience with this system during detector commissioning.