MINERvA DAQ SoftwareMINERvA DAQ Software

D. CasperD. CasperUniversity of California, IrvineUniversity of California, Irvine

Hardware SchematicHardware Schematic VME-based DAQVME-based DAQ

Readout & Slow Readout & Slow ControlControl

2-3 crates total2-3 crates total ~30,000 channels~30,000 channels

max 4 hits per max 4 hits per channel/spillchannel/spill

time + two charge time + two charge measurements for each measurements for each hithit

Fermilab Network

DAQComputerwith RAID

Cluster

PermanentStorage

Control RoomConsole

VME Crates

PVIC/VME Interface

CROC VMEReadout

Module (x11)

M64 MAPMT andTRiP-based Multi-BufferDigitizer/TDC Card withEthernet Slow-Control

Interface(12 PMTs/Ring)

LVDS Digital Token Ring(4 Rings/VME Module)

Two-tierLow-Voltage

Distribution SystemOptical FibersFrom Detector

48V, 20 A DC

Data RateData 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 30,000 channels 48 bytes/channel maximum 48 bytes/channel maximum

= 1.5 MByte per trigger= 1.5 MByte per trigger NuMI spill trigger rate: 0.5 HzNuMI spill trigger rate: 0.5 Hz Cosmics rate: ~10 HzCosmics rate: ~10 Hz Calibration data: ?Calibration data: ?

Total (maximum) raw data rate: 15 MB/secTotal (maximum) raw data rate: 15 MB/sec Expected raw data rate (with zero-Expected raw data rate (with zero-

suppression): < 0.5 MB/secsuppression): < 0.5 MB/sec

DAQ ComputerDAQ Computer

As proposed:As proposed: Dual CPU (2 Dual CPU (2 3.2 GHz Xeon) 3.2 GHz Xeon) PCI/VME InterfacePCI/VME Interface Two dual-port Gigabit ethernet Two dual-port Gigabit ethernet

interfacesinterfaces 408 GB on-board disk cluster (RAID-5)408 GB on-board disk cluster (RAID-5)

Data storage for ~1 week of data at Data storage for ~1 week of data at expected rateexpected rate

DAQ SoftwareDAQ Software Requirements not very demanding:Requirements not very demanding:

Low rateLow rate Monolithic readoutMonolithic readout Most complexity is in firmware, not softwareMost complexity is in firmware, not software Database, monitoring, maintenance utilities Database, monitoring, maintenance utilities

probably a good area for FNAL contributionprobably a good area for FNAL contribution Will we reconstruct data online?Will we reconstruct data online?

Certainly at some level, for data quality Certainly at some level, for data quality monitoringmonitoring

Expect reprocessing offlineExpect reprocessing offline Safety and Hazard MonitoringSafety and Hazard Monitoring

A separate (but important) issueA separate (but important) issue