SND data acquisition system upgrade

Abstract

The data acquisition (DAQ) system of the SND detector successfully operated during four data-taking seasons (2010)(2011)(2012)(2013) at the e + e -collider VEPP-2000. Currently the collider is shut down for planned reconstruction, which is expected to increase the VEPP-2000 luminosity and data flow from the SND detector electronics by up to 10 times. Since current DAQ system implementation (electronics and computer part) does not have enough reserve for selection of events in the new environment without compromising quality, there arose the need for the system upgrade. Here we report on the major SND data acquisition system upgrade which includes developing new electronics for digitization and data transfer, complete redesign of the data network, increasing of the DAQ computer farm processing capacity and making the event building process concurrent. These measures will allow us to collect data flow from the most congested detector subsystems in parallel in contrast to the current situation. We would like to discuss also the possibility to implement full software trigger solution in the future.

DQM Tools and Techniques of the SND Detector

“…The SND detector [1][2][3] operates at the VEPP-2000 collider [4] since 2008. It produces hundreds gigabytes of stored raw data per day [5]. The data are complemented with dozens megabytes of metadata, facility conditions (beam energy, luminosity, crate temperatures, etc.)…”

Experiment Management System for the SND Detector

“…The upper bound of the raw data flow was estimated as 25Gb/s [5]. This results in a few hundred gigabytes of the data stored per day.…”