The Online Detector Control at the BaBar experiment at SLAC Pierluigi Paolucci I.N.F.N. of Napoli Introduction; System overview; Hardware description; Software description; Conclusions. 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Pigi Paolucci - I.N.F.N. of Napoli BaBar and PEP II BaBar is a B-factory experiment on the PEP II accelerator at the Stanford Linear Accelerator Center; The goal of this detector is to search for and study possible CP violation in the decay of the B meson; Such studies will require both high statistics and good control of systematics Stable and continuos operation under well-controlled conditions Online Detector Control plays an important role. 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Pigi Paolucci - I.N.F.N. of Napoli BaBar detector BaBar consists of 5 sub-detectors: Silicon Vertex Tracker; Drift Chamber; Detector of Internally Reflected Cherenkov ; ElectroMagnetic Calorimeter; Instrumented Flux Return. m detection and neutral hadron identification 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Pigi Paolucci - I.N.F.N. of Napoli DCS Overview Responsabilities of the detector control system: safe and reliable operation of BaBar detector; Report status of detector to the online system and PEP II; Configure the detector for calibration/physics data taking; Archive ambient data. Detector Control layer PEP II Database Run Control Component Proxy 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Pigi Paolucci - I.N.F.N. of Napoli 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Software Overview (EPICS) The BaBar/IFR Online Detector Control use VxWorks and EPICS to implement slow control data flow and to develop part of the readout module. 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Pigi Paolucci - I.N.F.N. of Napoli EPICS structure IFR software package has been developed starting from the EPICS database: 2600 hardware records + 1400 software records used to summarize the results and the status of each IFR subsystem/sector. Each record contains information as: scan period, alarm limit, alarm severity Hardware units, precision, conversion, link Software alarm/database/monitor dead-bands EPICS tools All the EPICS tools have access to the records. 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Software Overview (EPICS) Some EPICS tools are used in the BaBar experiment as the Alarm Handler. It display the Alarm Status of all the EPICS records, organized in “logical” threes. 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Pigi Paolucci - I.N.F.N. of Napoli Component Proxy Is a special software layer above EPICS structure; It fill the gap between EPICS and the BaBar Online; It also bridges the semantic gap between the C-language EPICS part and the Object-Oriented-C++ parts (Run Control, Archiving and Analysis. 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Pigi Paolucci - I.N.F.N. of Napoli EPICS is interfaced with the BaBar Run Control through the Component Proxy and with the BaBar Database through the Archiver and KeyLookup processes. Java is used to analyze the data retrieved from the db and to produce a set of histograms used during the data tacking. 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Pigi Paolucci - I.N.F.N. of Napoli BaBar Alarm Structure Each EPICS channel has 2 alarm limits: The first one is just a warning (color code is yellow); The second one is a real alarm (color code is red). The alarms are sent from the EPICS database to the EPICS Screen, Alarm Handler, Java Browser and Database. 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

IFR system description The Instrumented Flux Return consists of: 774 RPC chambers; 120 High voltage channels; 3000 front-end electronic cards; 50 low voltage power supplies; 8 DAQ crates; 200 temperature probe; Cosmic trigger system; Magnet Cooling system. 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

IFR Online Detector Control Overview Control and Monitor: hardware software High Voltage 80 800 Low Voltage 48 96 DAQ crate 8 400 Monitor: Single Counting Rate 1608 1608 Dark Current 804 1004 “Iron” Temperature 96 96 Gas system; 32 32 Trigger 16 16 TOTAL 2692 4052 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Detector Control DAQ system I Master VME crate placed in the electronic room with: CPU MVME 177; HV controller; 2 “CAN-bus” boards; 6 VME Scalers; 3 Gate Generators; 5 Interlock boards. 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Detector Control DAQ system II 8 Slave custom crate placed on the detector 8 digital multiplxers: 32 ECL input channels; Reset and Clock (NIM); 2 ECL/NIM output signals; 8 analog boards(CAN-bus); 1 controller: opto-coupled DMUX input and output signals. 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Pigi Paolucci - I.N.F.N. of Napoli Slave Crate Fast-OR signals Detector HV system Analog signals CaenNET CAN-bus Electronic house 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Pigi Paolucci - I.N.F.N. of Napoli RPC: Single Rate, Dark Current and Gas system. Front-end: Low Voltage and Single Rate. Detector: Trigger, Temperature and DAQ crate. ODC hardware schema 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Pigi Paolucci - I.N.F.N. of Napoli Single Counting Rate The 1608 fast-OR signals, generated by the front-end cards connected to the longitudinal strips, are used to monitor the Single Counting Rate of each RPC chamber. A digital multiplexer with 32 ECL input channels is used in order to reduce the number of channels to acquire. Using 8 Slave Crates 64 DMUXs 2048 channels the whole RPC system is monitored with 4 scaler boards. 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Pigi Paolucci - I.N.F.N. of Napoli Single Rate Monitor EPICS Proxy database ntupla 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Pigi Paolucci - I.N.F.N. of Napoli IFR State Machine BaBar has 3 different operating States, runnable, injectable and calibration corresponding at different hardware/software configuration of each subsystem. An EPICS State Machine (sequencer) receives the State key from the Run Control and set the IFR configuration (HV, LV and DAQ). It can work in Local mode (from the IFR console) or in Global mode (from the PEPII or BaBar console). It calculates also the status of each IFR hardware subsystems. 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Pigi Paolucci - I.N.F.N. of Napoli IFR Console 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Pigi Paolucci - I.N.F.N. of Napoli Wiener Crate Monitor 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Pigi Paolucci - I.N.F.N. of Napoli HV Console 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli

Pigi Paolucci - I.N.F.N. of Napoli Conclusions The IFR Detector Control is working since January 1999. The data collected up to now have been used to study the performances of the detector during the Cosmic Run and to monitor it during the Data tacking. All the ODC information are stored into the BaBar database permitting to use the detector conditions in the offline analysis. EPICS proved to be a very powerful, reliable and friendly system to control and monitor both BaBar and PEP II. 14 January 2019 Pigi Paolucci - I.N.F.N. of Napoli