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LHCb Online

LHCb Online. & the Conditions DB. LHCb Online. DCS Devices (HV, LV, GAS, Temperatures, etc.). Detector Channels. Trigger. Front End Electronics. Experiment Control System. Readout Network. Processing/Filtering Farm. Storage. DAQ. External Systems(LHC,Technical Services,Safety,etc).

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LHCb Online

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  1. LHCb Online & the Conditions DB

  2. LHCb Online DCS Devices (HV, LV, GAS, Temperatures, etc.) Detector Channels Trigger Front End Electronics Experiment Control System Readout Network Processing/Filtering Farm Storage DAQ External Systems(LHC,Technical Services,Safety,etc)

  3. Online Usage of CondDB • Two completely independent users: • As Publisher • The Experiment Control SystemWrites Online Conditions to the DB • As Consumer • The Event Filter Farm AlgorithmsNeed Conditions for their processing/filtering tasks

  4. Online Conditions Sources • DCS • High Voltages, temperatures, pressures, etc. • DAQ & L0 Trigger • Pedestals, thresholds, zero suppression parameters, gains, etc. • DAQ & Trigger setup parameters • EFF (Event Filter Farm) • Pedestals, Thresholds, Gain Calibration, Alignment Constants, etc. • Trigger setup parameters • External Systems • Accelerator data: energy, luminosity, average bunch currents, etc.

  5. Online Conditions Publisher • From the Control System point of view: • Only output • Only one interface: • from the ECS i.e. PVSS • Clients (offline algorithms) determine: • Data organization • Data format: XML (?) • Data update rate • Data could be stored in the Cond DB only if it changed by more than X or every hour • independently of the PVSS read-out rate.

  6. Conditions Data Types • Raw DataValues read directly from hardware (ex.: HV readings, Temperatures, raw alignment data, etc.) • No Versions, no Tags • Processed DataResults of calculations done on raw data (ex.: calibration constants, alignment, etc.) • Automatic Versioning, User Tags • All Online data stored as "Raw Data"

  7. Experimental Equipment Data Handling Architecture • Three Logical Databasesin the Online System Conf. DB ... ... PVSS PVSS PVSS PVSS PVSS Arch. PVSS PVSS PVSS PVSS ... ... . . Cond. To Offline To Offline DB

  8. Online Database Contents • Configuration DB contains: • All data needed to configure the HW (or SW) for the various running modes • Ex.: HV V0 Settings, Pedestal settings, trigger settings, etc. • PVSS Archive contains: • All monitoring data read from HW for monitoring and debugging of the Online System • Ex.: HV Vmon Readings, pedestal readings, etc. • Conditions DB contains: • A subset of the monitoring data read from HW if it is needed for Offline processing • Ex.: HV Vmon Readings if changed by more than n Volts • Some configuration data once it has been used • Ex.: Trigger settings used by a particular run

  9. Dataflow Example Conf. DB Configuration settingsfor a running mode if Needed for next run settings(Pedestal Followers) PVSS Experimental Equipment PVSS PVSS Arch. Monitoring data(at regular intervals) if Archive On if Passes Conditions filter . . Cond. To Offline To Offline DB

  10. ECS CondDB Architecture • Define filters in PVSS:(per device type/device) • Archive • Condition: • filter expressions • Uses LCG: • COOL • RAL • SEAL • POOL • BOOST • etc. … Control PCPVSS Control PCPVSS Control PCPVSS ~100 ConditionsData Cond. DBServer Cond. DBServer . . Cond. DB

  11. Event Builder Switch SFC SFC SFC CPU CPU CPU . . . CPU CPU CPU . . . . . . . . . CPU CPU CPU Event Filter Farm & CondDB • CPUs run "Offline" Algorithms Online: • Within Gaudi FW(interfaced to PVSS) • Need Conditions: • The Control PCs will get a snapshot of the CondDB (at Start of Run) and distribute to CPUs • A few well-chosen Conditions can be updated while running

  12. CPU CPU CPU CPU CPU CPU CPU CPU CPU Dataflow Example Event Builder Switch Control PCPVSS Control PCPVSS SFC SFC SFC • Special filter for some conditions • Trigger Farm Update CPU CPU CPU . . . CPU CPU CPU t0 . . . . . . . . . Cond. DBServer Cond. DBServer CPU CPU CPU Validity Start = t0+Dt Control PCPVSS Control PCPVSS . . Cond. DB New Condition Update (t0+Dt) At Run Start

  13. Event Builder Switch SFC SFC SFC CPU CPU CPU CPU CPU CPU . . . CPU CPU CPU CPU CPU CPU . . . . . . . . . CPU CPU CPU CPU CPU CPU Control PCPVSS Control PCPVSS Ex: The VeLo Alignment Control PCPVSS Control PCPVSS Cond. DBServer Cond. DBServer Control PCPVSS . . Cond. DB

  14. Online/Offline Synch Offline Cond DB Online Cond DB RichAl RichAlOn VeloAl VeloAlOn RichAlOn RichAl VeloAlOn VeloAl • Synchronized by Oracle Tools

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