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Commissioning of the ATLAS Level-1 Central Trigger

Commissioning of the ATLAS Level-1 Central Trigger. S. Ask 1) , D. Berge 1) , N. Ellis 1) , P. Farthouat 1) , P. Gallno 1) , S. Haas 1) , A. Krasznahorkay 1)2) , T. Pauly 1) , G. Schuler 1) , R. Spiwoks 1) , T. Wengler 3). 1) CERN, Switzerland 2) University of Debrecen, Hungary

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Commissioning of the ATLAS Level-1 Central Trigger

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  1. Commissioning of the ATLAS Level-1 Central Trigger S. Ask1), D. Berge1), N. Ellis1), P. Farthouat1), P. Gallno1), S. Haas1), A. Krasznahorkay1)2), T. Pauly1), G. Schuler1), R. Spiwoks1), T. Wengler3) 1) CERN, Switzerland 2) University of Debrecen, Hungary 3) University of Manchester, UK Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  2. Overview • Central Trigger installation status • Muon-to-Central-Trigger-Processor Interface (MUCTPI) • Central Trigger Processor (CTP) • Commissioning and integration • Trigger inputs: • Level-1 Calorimeter Trigger (L1Calo) • Barrel Muon Trigger (RPC) and MUCTPI • Central Trigger Processor • Trigger outputs: • Distribution of trigger, timing and controls signals, read-out • CTP-Links to sub-system partitions • Level-2 • Combined Cosmics with RPC, MDT (precision muon chambers), tile calorimeter (hadronic), Central Trigger • Results • Conclusions and outlook Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  3. Calorimeter Detectors Muon Detectors Pre-processor Barrel Muon Trigger (RPC) End-cap Muon Trigger (TGC) Cluster Processor (e/γ and τ/h) Jet/Energy Processor Muon-CTP-Interface (MUCTPI) Common Merger Modules Central Trigger Processor (CTP) ... Level-2 LTP LTP TTC Partition TTC Partition TTC Busy TTC Busy Detector Front-Ends/Read-out ATLAS Level-1 Trigger System • Synchronous, pipelined processing at 40MHz • Level-1 latency: 2000ns (+ 500ns safety) • Level-1 output rate: < 100 kHz • LTP = Local Trigger Processor (Standard sub-detector interface to the CPT) • TTC = Timing, Trigger & Control • Busy = Tree of Busy Modules • ATLAS has about 40 TTC Partitions subject of this talk Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  4. MUCTPI at Point 1 • Demonstrator installed • provides almost full functionality • missing some flexibility in overlap handling (see Stefan Haas) • MIOCT: • Input module for octant. Current configuration allows 14 trigger sectors (out of 208) to be connected • Connected with 2 RPC prototype sector logic modules (see Riccardo Vari) • MICTP: Timing distribution and trigger (muon multiplicities) output to CTP • MIROD: S-Link output to Level-2 and ROS • MIBAK: custom active backplane for readout and multiplicity summation Installed at Point 1 MICTP MIROD MIOCT Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  5. Central Trigger Processor at Point 1 • Final modules installed • 1 CTP_IN for 4 trigger input cables • 2 more to come • CTP_MI: Machine interface (clock and orbit input) • CTP_MON: Monitoring of trigger input per bunch crossing ID • CTP_CORE: Trigger decision according to trigger menu • 4 x CTP_OUT: Output to sub-detectors • NIM-to-LVDS converter module to connect individual trigger signals • Two more CTP systems in laboratory for hardware test and software development Installed at Point 1 Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  6. Trigger Inputs - L1Calo • Integration test to CTP in July: • sent known pattern at 40MHz from L1Calo Common Merger Module (final) to CTP_IN • receival of patterns in CTP_IN memory and comparison with known pattern • no errors found over 15 minutes • minor firmware bug discovered in treatment of parity • two faulty cables discovered Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  7. Trigger Inputs - RPC/MUCTPI • Barrel Muon Trigger (RPC) Sector 13: • Sector 13 is so far the only sector fully equipped with cables and services • Barrel Middle and Barrel Outer Chambers used, defining 6 trigger towers • Connection between two RPC prototype sector logic modules and MUCTPI: • link0: towers 0+1 • link1: tower 2 • link from MUCTPI to CTP • CTP: • one NIM trigger signal from sector 13 • CTP configured to trigger on: NIM OR link0/link1 RPC1 RPC2 RPC3 3 4 5 NIM signal Sector 13 0 1 2 link1 link0 Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  8. Trigger inputs - RPC/MUCTPI • MUCTPI: • phase measured of link0 and link1 clock • link from MUCTPI to CTP • CTP: • phase measured between MUCTPI input and clock • NIM signal delayed by 6 BC wrt MUCTPI signals • due to MUCTPI latency CTP MUCTPI link0 link1 NIM signal 3 4 5 Link0 Sector 13 0 1 2 Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  9. Central Trigger Processor • Central trigger hardware well integrated with the ATLAS Run Control • Configuration from trigger database possible • Simple trigger menu for integration with muons: • require at least one muon candidate from MUCTPI for any pt threshold • sector 13 NIM trigger • GPS-timestamp for each accepted event from General-Machine-Time receiver • Deadtime mechanism tested • Basic monitoring tools: • deadtime • L1A counters in CTP and MUCTPI • Muon multiplicity counters in MUCTPI ATLAS Run Control Monitoring Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  10. Distribution of trigger, timing and controls signals, read-out • Signals: • Clock, Orbit, L1A, ECR (event counter reset) • BUSY (backpressure from readout) • CTP: • Clock and orbit are received from machine (RF2TTC, see Sophie Baron) or generated internally • ECR generated periodically with 0.1-1Hz • Internal distribution in the CTP VME crate • MUCTPI: • distribution directly via LEMO cables • other sub-systems: • differential link (10-30m) between CTP_OUTs and sub-system Local Trigger Processor (LTP) LTP TTC Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  11. CTP Links to Sub-System Partitions C T P Local Trigger Processor 1 Pixels Installed and tested 2 SCT Clock 3 TRT 4 L1Calo Orbit 5 LAr Barrel 6 LAr EMEC 7 LAr HEC LAr FCAL (to be combined with LAr HEC) 8 9 Tile Long-Barrel 10 Tile Ext-Barrel 11 RPC 12 MDT Barrel 13 MDT End-Cap 14 TGC-A TGC-C (to be combined with TGC-A) 15 16 CSC 17 Roman Pots 18 19 20 Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  12. Readout of the Central Trigger • Final readout links (S-Link) to Readout systems (ROS, 2 PCs) • Connection tested in standalone mode: • consistency between the MUCTPI and CTP data • rate limited by temporary event building to about 25 kHz • backpressure mechanism functional MUCTPI CTP Readout Link ROS ROS control network temporary event builder File Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  13. Integration with Level-2 • see also: Yuri Ermoline • Test: Comparison of central level-1 trigger data from two different streams, after event building (in SFI): • trigger stream • readout stream • Read out both streams at 20 kHz • rate limited by back-pressure from Level-2 • no errors found • minor problem with identifiers found and fixed Underground MUCTPI CTP RoI Readout System Region-of- Interest Builder Level-2 Supervisor L2PU L2Result Handler Dataflow Manager Event building Surface Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  14. Combined Cosmics with RPC, MDT, Tilecal • Combined cosmics run with sector 13 in August • Temporary gas systems operational both for RPC and MDT • Combined partition: • Trigger: RPC, MUCTPI, CTP • Readout: RPC, MDT, Tilecal, L1Central • timing-in: guess & try • about 500k events recorded at 40Hz TileCal MDT RPC Trigger path Readout path CTP MuCTPI Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  15. Results from combined cosmics: MUCTPI + CTP 50% NIM (0 candidates) 50% NIM+MUCTPI only NIM signal Sector logic candidates NIM + Sector Logic M U C T P I NIM signal 3 4 5 CTP NIM 40 Hz Sector 13 0 1 2 link1 link0 MUCTPI CTP MUCTPI Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  16. Results from combined cosmics:CTP Time difference between consecutive events: Exponential, as expected from cosmics 20 BC (500ns) of deadtime introduced Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  17. Results from combined cosmics: MUCTPI, CTP, and RPC OK. Some bugs in sector decoding found Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  18. Level-1 latency • RPC readout window: 1825-2000 ns (70-80 BCs) • from chamber hit to arrival of L1A • consistent with latency budget of 2000ns (+500ns safety) • Trigger input: • RPC(SL) --> MUCTPI: 3 BC • MUCTPI: 6 BC  OK • RPC(NIM) --> CTP: 3 BC • delayed in CTP_IN by 6 BC to align with MUCTPI trigger inputs • Trigger decision: • CTP: 4 BC  OK • Trigger distribution: • CTP --> RPC: 4 BC time 4BC 4BC 6BC 3BC CTP RPC Sector Logic MUCTPI Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  19. Combined cosmics: some results Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  20. Conclusions • Level-1 Central Trigger (CTP and MUCTPI) is installed and functional at Point-1 with mainly final hardware • A complete trigger and read-out chain has been successfully operated in the cavern with cosmics • CTP triggered on signals from barrel muon trigger (sector 13) • Read out RPC, MDT, Tilecal, CTP and MUCTPI • First integration tests with Level-2 were successful • Integration and commissioning is in full swing • More trigger inputs soon • More detectors to be read-out • Need systematic strategy of treating a bigger system (timing-in, monitoring, configuration, ...) Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  21. Outlook: Looking forward to ... ... receiving trigger signals from end-cap muon trigger and calorimeter trigger ... reading out more parts of ATLAS End-cap muon trigger L1 Calorimeter Trigger Integration and commissioning continues ... Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  22. backup Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

  23. 40 MHz ROIB L2SV DFM ROD ROD ROD 100 kHz ROB ROB ROB L2N L2P ~3 kHz EBN SFI EFN EFP SFO ~ 200 Hz ATLAS Trigger DAQ Trigger DAQ Calo MuTrCh Other detectors Level 1 40 MHz 2.5 ms Det. R/O L1 accept (100 kHz) 120 GB/s RoI Dataflow High Level Trigger ~10 ms L2 ROS RoI requests O(150) PCs O(500) PCs ~4 GB/s RoI data (~2%) EB L2 accept (~3.5 kHz) O(100) PCs ~ sec EF O(1900) PCs ~ 300 MB/s EF accept (~0.2 kHz) Thilo Pauly -- LECC 2006 Valencia -- 26 September 2006

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