MINERvA DAQ Software D. Casper University of California, Irvine

Hardware Schematic VME-based DAQ VME-based DAQ Readout & Slow Control Readout & Slow Control 2-3 crates total 2-3 crates total ~30,000 channels ~30,000 channels max 4 hits per channel/spill max 4 hits per channel/spill time + two charge measurements for each hit time + two charge measurements for each hit

Data Rate Assuming 100% occupancy each spill: Assuming 100% occupancy each spill: (In real life, expect closer to few %...) (In real life, expect closer to few %...) 30,000 channels  48 bytes/channel maximum = 1.5 MByte per trigger 30,000 channels  48 bytes/channel maximum = 1.5 MByte per trigger NuMI spill trigger rate: 0.5 Hz NuMI spill trigger rate: 0.5 Hz Cosmics rate: ~10 Hz Cosmics rate: ~10 Hz Calibration data: ? Calibration data: ? Total (maximum) raw data rate: 15 MB/sec Total (maximum) raw data rate: 15 MB/sec Expected raw data rate (with zero-suppression): < 0.5 MB/sec Expected raw data rate (with zero-suppression): < 0.5 MB/sec

DAQ Computer As proposed: As proposed: Dual CPU (2  3.2 GHz Xeon) Dual CPU (2  3.2 GHz Xeon) PCI/VME Interface PCI/VME Interface Two dual-port Gigabit ethernet interfaces Two dual-port Gigabit ethernet interfaces 408 GB on-board disk cluster (RAID-5) 408 GB on-board disk cluster (RAID-5) Data storage for ~1 week of data at expected rate Data storage for ~1 week of data at expected rate

DAQ Software Requirements not very demanding: Requirements not very demanding: Low rate Low rate Monolithic readout Monolithic readout Most complexity is in firmware, not software Most complexity is in firmware, not software Database, monitoring, maintenance utilities probably a good area for FNAL contribution Database, monitoring, maintenance utilities probably a good area for FNAL contribution Will we reconstruct data online? Will we reconstruct data online? Certainly at some level, for data quality monitoring Certainly at some level, for data quality monitoring Expect reprocessing offline Expect reprocessing offline Safety and Hazard Monitoring Safety and Hazard Monitoring A separate (but important) issue A separate (but important) issue