Status of the ATLAS Central Trigger

Transcription

1 Status of the ATLAS Central Trigger Introduction Central Trigger Processor Local Trigger Processor Timing, Trigger & Control Conclusion (CTP) (LTP) (TTC) on behalf of CERN/ATLAS/Level-1 team: N. Ellis, P. Farthouat, P. Gallno, T. Maeno, K. Nagano (until 31/03/03), H. Pessoa Lima, T. Schörner-Sadenius, G. Schuler, R. Spiwoks, R. Teixeira, T. Wengler R.Spiwoks LHCC Comprehensive Review - 30/06/03 1 of 15

2 Level-1 Trigger - Overview (1) calo muon Preprocessor (RPC) Barrel Trigger (TGC) Endcap Trigger Cluster Processor (e/γ & τ/h) Jet/Energy Processor (jet & energy) Muon-CTP-Interface Central Trigger Processor TTC Partitions detector front-end R.Spiwoks LHCC Comprehensive Review - 30/06/03 2 of 15

3 Level-1 Trigger - Overview (2) Functionality: - Calo, muon (and other) trigger processors provide trigger information trigger multiplicities for electrons/photons, taus/hadrons, jets, muons trigger flags for ΣE T, E T miss, ΣE T jet (all for programmable trigger thresholds). - Central Trigger Processor (CTP) receives trigger information and generates Level-1 Accept (L1A) according to Level-1 trigger menu. - Timing, Trigger and Control (TTC) partitions receive the CTP signals (L1A,...) and distribute them to the detector front-end. - Each TTC partitions contains: Local Trigger Processor (LTP) which selects CTP input or generates signals locally. TTC system which is an optical-broadcast system for fast signals. ROD_BUSY chain which is an asynchronous fast feed-back channel. R.Spiwoks LHCC Comprehensive Review - 30/06/03 3 of 15

4 Level-1 Central Trigger (1) calo muon Central Trigger Processor Online System DAQ LTP LTP LTP TTC TTC TTC Level-2 detector front-end R.Spiwoks LHCC Comprehensive Review - 30/06/03 4 of 15

5 Level-1 Central Trigger (2) Interaction with other parts of T/DAQ: - CTP sends Region-of-Interest (RoI) information to the RoI Builder (RoIB)which combines it with informationfrom other sources in the Level-1 Trigger and sends it to the Level-2 Trigger. - CTP sends event data to the Read-out System (ROS), i.e. the CTP is a Read-out Driver (ROD). - CTP, all LTPs and parts of the TTC system are configured, controlled and monitored via the Online System. R.Spiwoks LHCC Comprehensive Review - 30/06/03 5 of 15

6 Central Trigger Processor (1) Functionality: calo muon other CMB DT CMB Trigger information Level-1 Accept (L1A): calo, muon trigger Prescaler OR Combinatorial Logic fortrigger Menu Deadtime Logic DT CTP = multiplicities and flags TTC Level-2 DAQ + other triggers = calibration, test,... (total 160 input bits) programmable trigger menu (total ~160 items) Additional features: trigger-type word, deadtime (2 priorities), pre-pulse (calibration) Data for Level-2 (RoI), DAQ ( ROD), and monitoring R.Spiwoks LHCC Comprehensive Review - 30/06/03 6 of 15

7 Design: OUT_bus PIT_bus COM_bus VME_bus Central Trigger Processor (2) M I I I M I N N N O N C OR O UT O UT O UT E BC/ORBIT/ ECR/BUSY 4 SDP[30..0] 4 SDP[30..0] 4 SDP[30..0] L2_Link/RO_Link 5 LTP Link O UT C AL 5 LTP Link 5 LTP Link 5 LTP Link CAL[30..0] TST/beam pick-up R.Spiwoks LHCC Comprehensive Review - 30/06/03 7 of 15

8 Central Trigger Processor (3) CTP_IN: - receives trigger information from trigger processors (calo, muon, others) - synchronizes (w.r.t. clock) and aligns (w.r.t. BCID) the information - selects information to be sent on backplane - provides/stores trigger information from/into test memory CTP_CORE: - combines trigger information into trigger items and forms L1A - adds dead-time - forms RoI and ROS information and sends them to RoIB and ROS CTP_OUT: - fans out timing and trigger signals to the sub-detectors - receives sub-detector busy signals and calibration requests CTP_MI: - receives timing signals from LHC (via TTCmi) - controls and monitors busy signals (internal and external) CTP_MON: - monitors trigger information on a bunch-to-bunch basis CTP_CAL: - time-multiplexes sub-detector calibration requests (per ORBIT) - sends calibration requests to CTP_IN - receives external beam pick-up and test signals R.Spiwoks LHCC Comprehensive Review - 30/06/03 8 of 15

9 Central Trigger Processor (4) Milestones: - Final Design Review in autumn Full system test in spring Status: - 9U VME64x crate to be delivered in July backplane manufactured - CTP_MON being manufactured - CTP_IN being designed - CTP_MI being designed - CTP_CORE some ideas; to be designed after CTP_IN and CTP_MI - CTP_OUT some ideas; to be designed after CTP_CORE - CTP_CAL some ideas; to be designed after CTP_CORE R.Spiwoks LHCC Comprehensive Review - 30/06/03 9 of 15

10 Link CTP to LTP Each TTC Partition has one LTP: - CTP_OUTs send signals to about 10 (maximum 20) sub-detectors. The sub-detectors are sub-divided into about 40 TTC partitions. - Several TTC partitions of the same sub-detectors are daisy-chained via LTPs. - CTP-LTP Link 1 cable: CTP LTP - Length of link up to 30 m high-quality, low-skew cable. CTP LTP BC 1 bit calibration request 3 bit ORBIT 1 bit BUSY 1 bit L1A 1 bit ECR 1 bit trigger type 8 bit pre-pulse 1 bit R.Spiwoks LHCC Comprehensive Review - 30/06/03 10 of 15

11 Local Trigger Processor (1) Functionality: - Original idea by G. Perrot (LAr) - Input: CTP/daisy-chain, local input, pattern generator - Output: daisy-chain, TTCvi, local output Programmable input/output switch for timing&control signals Run Modes: - Common mode: CTP drives the TTC partitions. - Stand-alone mode: LTP drives the TTC partition (local input or pattern generator). - Combine tow or more TTC partitions: one LTP is the master (replacing CTP), others are slaves. R.Spiwoks LHCC Comprehensive Review - 30/06/03 11 of 15

12 Local Trigger Processor (2) Design: - 2-slot 6U VMEbus module - Front panel is covered almost exclusively with I/O: input from CTP, daisy-chain, local input, TTCvi + local output. Status: - Design has been discussed with all sub-detectors (included many of their comments). - Can now progress with detailed design (board) manufacturing of prototype until end of this year. R.Spiwoks LHCC Comprehensive Review - 30/06/03 12 of 15

13 Timing, Trigger and Control Functionality: Broadcast of fast signals: BC, L1A, ORBIT, ECR,... Implementation: TTCvi TTCex/TTCtx/TTCvx ( TTCoc ) TTCrx Status: - Various components have been defined and built in the context of the RD12 project. - FDR (spring 2002): obtained numbers of each component in final system. - Final modules are being built. - Cabling and installation is being planned now. R.Spiwoks LHCC Comprehensive Review - 30/06/03 13 of 15

14 ROD_Busy Module Functionality: Collect busy signals from sub-detectors RODs, monitor them, and send them to CTP in order to throttle the generation of L1As. Status: Few modules have been manufactured, wait for real users (RODs). R.Spiwoks LHCC Comprehensive Review - 30/06/03 14 of 15

15 Conclusion CTP: - Design is well in progress. - Prototype modules this year full system test next year. - Engineering effort is limited some delays in schedule. LTP: - Design is well in progress. - Prototype module can be built until end of this year. TTC: - Components are well defined. - Production of final numbers is well advanced. - Cabling and installation are being planned. R.Spiwoks LHCC Comprehensive Review - 30/06/03 15 of 15