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Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test

Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test. Overview:. Introduction to LHC Overview of CMS Overview of Trigger Architecture Overview of Cathode Strip Chamber (CSC) Level-1 Trigger System Plots for efficiency Conclusion. LHC.

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Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test

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  1. Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test

  2. Overview: • Introduction to LHC • Overview of CMS • Overview of Trigger Architecture • Overview of Cathode Strip Chamber (CSC) • Level-1 Trigger System • Plots for efficiency • Conclusion

  3. LHC • 14 TeV center of mass energy • 27 km circumference

  4. CMS (Compact Muon Solenoid)

  5. CMS What is a muon? Muons are point particles identical to electrons except over 200 times more massive (105.2 MeV) The illustration shows the smaller orbit for muons in a hydrogynic atom due to their mass

  6. CMS Why Muons? • Muons are penetrating. • Electrons are too light to make it through absorbers • Taus are too unstable to make it through absorbers • Hadrons interact strongly with matter

  7. Trigger Architecture • Need Trigger System to filter out data

  8. Cathode Strip Chambers (CSC) • Provide 3-D tracks of charged particles called Local Charge Tracks (LCT’s)

  9. Level-1 Trigger System

  10. Level-1 Trigger System • ALCT and CLCT find 2-D tracks • TMB receives and correlates these tracks to make a 3-D Correlated LCT • MPC receives up to 18 LCT’s from the different TMB’s and selects the best 3 • SR/SP receives the 3 LCT’s from the TMB

  11. 2004 Test Beam • 100GeV muons for asynchronous run • 100GeV pions for synchronous run (along with muons)

  12. Angle vs. Trigger Mode

  13. Pattern vs. Trigger Mode

  14. NPH Pattern vs. Trigger Mode (for Andrey Pattern)

  15. Conclusions • Andrey Pattern does the best for higher nph patterns • Keeps Efficiency high and ghost rates low

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