The CMS Muon Trigger

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1 The CMS Muon Trigger Outline: o CMS trigger system o Muon Lv-1 trigger o Drift-Tubes local trigger o peformance tests CMS Collaboration 1

2 CERN Large Hadron Collider start-up 2007 target luminosity 10^34 /cm2/sec initially 2*10^33/cm2/sec pp interaction rate 700MHz bunch Xing frequency 40MHz = 1 every 25ns events/ active Xing =23 Physics Selectivity need 1:10^11 for exploring Higgs sector the LHC 2

3 CMS at LHC 4Tesla 2Tesla the Compact Muon Solenoid detector omni-purpose with emphasis on muon detection cylinder Diam=16m, Lenght=25m, weight=14000ton 2*10^7 electronics channels CMS collaboration 150 institutes worldwide 1900 scientists 3

4 Physics with Muons at LHC Many interesting Physics channels produce high-pt leptons. For instance: Standard model Higgs H Z Z* (4 leptons) H (< 2MW) b b (lepton + X) SUSY Higgs h, H, A τ τ (lepton + X) or µµ Other new particles Z' dileptons Leptoquark decays Top physics 4

5 CMS Trigger System Overview System Lv-1 Output 5

6 Level-1 Trigger Decision Loop 40 MHz Synchronous digital system no deadtime: every BX is analysed at Lv-1 only calorimeters and muon detectors 128 BXs to HLT processors 6

7 CMS Muon Detectors Muon stations in the iron yoke Barrel: Drift Tubes Chambers Resistive Plates Chambers (double gap) End-Cap: Cathode Strip Chambers RPC 7

8 Drift Tubes Chambers (Aachen,Bologna,Padova,Madrid,Torino) strips at 1800V, wires at 3600, I-Beams at -1200V 8

9 architecture of the Lv-1 Muon Trigger tasks of the LV-1 muon trigger: muon identification transverse momentum measurement bunch Xing identification 2 independent trigger systems in the barrel (DT+RPC) 2 independent trigger systems in each end-cap (CSC+RPC) 9

10 CMS trigger system: location of devices Local trigger electronics On detector DT/CSC Muon Segment generation RPC Muon Hit generation Regional trigger electronics In Underground shielded room DT/CSC Muon Track Finder RPC Muon Pattern Logic 10

11 DT local trigger overview A single large synchronous 40 MHz digital system of ASICs Two best muon segments on output from each chamber: Higher On-chamber boards quality Higher Pt Output at fixed latency after the parent BX 30 BXs pipeline (drift included) 11

12 DT local trigger: MiniCrate Highly compact 16-layer-boards with a 100-line bus interconnection TRACO ASICs TSS ASICs TSM: 3 pasics Local trigger electronic boards hosted in a MiniCrate inserted in the chamber mechanical structure Fewer cable connections Reliability issue Access to ASICs for test and configuration via JTAG Custom Parallel Interface 12

13 DT local trigger: Robustness Highly segmented system (SORT TREE): 4 to 6 Trigger Boards with 32BTIs, 4TRACOs, 1TSS Each TRACO covers 20cm of a DT ch. (Rϕ) Trigger Server Board has 3 pasics with redundant functionalities, which have separate power- and control- lines Trigger Boards Trigger Server Board 13

14 DT local trigger: Radiation tolerance During LHC running for the CMS Muon barrel it is predicted: Total neutron flux 3*10^10 /cm2 in 10 years Flux of >20MeV n 1*10^9 Total Ionizing Dose 0.01 Krad All on-chamber electronic components passed irradiation tests also using a high intensity 60 MeV proton beam Single-Event-Effect Xsec measured for each active component Single Event Upset rate for the whole DT system estimated in a few instances per year of LHC running pasic irrradiation test at the CRC of UC Louvain (Belgium) 14

15 DT test with the LHC-like bunched beam System integration tests have been carried out for over a year. A full DT chamber equipped with MiniCrate has been exposed to the muon 40MHz bunched the CERN H6 beamline from May 24 to June 1, 2003 About triggers were collected in 7 angular orientations (-30deg to +45deg) and 17 different BTI-TRACO- TSS-TSM configurations. Analysis of these data will allow thorough characterization of the performance and fine tuning of the simulation. They can also be used as input patterns for testing the DT Track Finder. Preliminary results are in agreement with expectations: 98% efficiency of finding a muon segment at the correct bx <1mm segment position uncertainty 5 to 20 mrad segment direction uncertainty, depending on segment quality (two or one super-layer used) 15

16 DT regional trigger: Track finder processor (Vienna) Accepts DT segments from 4 stations in a sector + neighbours Accepts also CSC segments in overlap η region Combines segments into full tracks Assigns Pt,η,ϕ,quality to each muon track 16

17 Lv-1 DT trigger: expected performance Chamber local trigger has a very efficient and configurable filter against fake and duplicate track segments Reliable dimu trigger Regional trigger has a sharp rise of the efficiency to identify a muon above a Pt threshold as function of generated Pt 17

18 global muon trigger: expected performance system simulation on single muon generated events show: 96% efficiency for finding at least one muon in 0< η < % ghost dimuons 18

19 Lv-1 Muon trigger rates iso-rate curves (KHz); h <2.1 ew 90% ez 99% eh(150) fizz*fi4m 98% ew 82% ez 97% eh(150) fizz*fi4m 98% 50KHz DAQ / 4 KHz for m, mm 100KHz DAQ / 8 KHz for m, mm 19

20 summary The CMS trigger system consists of a Lv-1 trigger implemented with custom electronics a High-Level trigger selection running in CPU farms The Lv-1 system has to select 1 in 10^3 LHC bunch Xings with no dead time and an output rate <100KHz The Muon Lv-1 trigger utilizes signals from 3 independent detectors (DriftTubes and ResistivePlateCh in the CMS barrel; CathodeStripCh and RPC in the end-caps) The DriftTubes Lv-1 local trigger is a large synchronous 40 MHz digital system of ASICs in minicrates on the DT chambers. It provides: muon track segment position and Pt measurement bunch Xing identification the Minicrate electronics has perfomed very successfully in a test with the CERN LHC-like 40 MHz bunched beam 20

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