Journal
SENSORS
Volume 22, Issue 14, Pages -Publisher
MDPI
DOI: 10.3390/s22145197
Keywords
xenon TPC; data acquisition circuits; FPGA; data compression techniques
Funding
- European Research Council (ERC) [101039048-GanESS, 951281-BOLD]
- European Union [957202-HIDDEN]
- MCIN/AEI of Spain
- ERDF A way of making Europe [RTI2018-095979]
- Severo Ochoa Program grant [CEX2018-000867-S]
- Maria de Maeztu Program grant [MDM-2016-0692]
- Generalitat Valenciana of Spain [PROMETEO/2021/087, CIDEGENT/2019/049]
- Portuguese FCT [UID/FIS/04559/2020]
- Pazy Foundation (Israel) [877040, 877041]
- US Department of Energy [DE-AC02-06CH11357, DE-AC02-07CH11359, DE-FG02-13ER42020, DE-SC0019054, DE-SC0019223]
- US National Science Foundation [NSF CHE 2004111]
- Robert A Welch Foundation [Y-2031-20200401]
- Kreitman School of Advanced Graduate Studies at Ben-Gurion University
- Marie Sklodowska-Curie grant [101026628]
- U.S. Department of Energy (DOE) [DE-SC0019054, DE-SC0019223] Funding Source: U.S. Department of Energy (DOE)
- Marie Curie Actions (MSCA) [101026628] Funding Source: Marie Curie Actions (MSCA)
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This paper describes the data compression techniques applied to the sensor data in the NEXT-100 detector to reduce data throughput, minimize dead time, and maintain the event rate at a stable level.
NEXT collaboration detectors are based on energy measured by an array of photomultipliers (PMT) and topological event filtering based on an array of silicon photomultipliers (SiPMs). The readout of the PMT sensors for low-frequency noise effects and detector safety issues requires a grounded cathode connection that makes the readout AC-couple with variations in the signal baseline. Strict detector requirements of energy resolution better than 1% FWHM require a precise baseline reconstruction that is performed offline for data analysis and detector performance characterization. Baseline variations make it inefficient to apply traditional lossy data compression techniques, such as zero-suppression, that help to minimize data throughput and, therefore, the dead time of the system. However, for the readout of the SiPM sensors with less demanding requirements in terms of accuracy, a traditional zero-suppression is currently applied with a configuration that allows for a compression ratio of around 71%. The third stage in the NEXT detectors program, the NEXT-100 detector, is a 100 kg detector that instruments approximately five times more PMT sensors and twice the number of SiPM sensors than its predecessor, the NEXT-White detector, putting more pressure in the DAQ throughput, expected to be over 900 MB/s with the current configuration, which will worsen the dead time of the acquisition data system. This paper describes the data compression techniques applied to the sensor data in the NEXT-100 detector, which reduces data throughput and minimizes dead time while maintaining the event rate to the level of its predecessor, around 50 Hz.
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