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
• 14 TeV center of mass energy• 27 km circumference
CMS (Compact Muon Solenoid)
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
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
Trigger Architecture
• Need Trigger System to filter out data
Cathode Strip Chambers (CSC)
• Provide 3-D tracks of charged particles called Local Charge Tracks (LCT’s)
Level-1 Trigger System
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
2004 Test Beam
• 100GeV muons for asynchronous run
• 100GeV pions for synchronous run (along with muons)
Angle vs. Trigger Mode
Pattern vs. Trigger Mode
NPH Pattern vs. Trigger Mode (for Andrey Pattern)
Conclusions
• Andrey Pattern does the best for higher nph patterns
• Keeps Efficiency high and ghost rates low