Local performance of the local cathode strip chamber trigger in a muon beam test
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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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Presentation Transcript

Overview
Overview: in a Muon Beam Test

  • 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 in a Muon Beam Test

  • 14 TeV center of mass energy

  • 27 km circumference


CMS (Compact Muon Solenoid) in a Muon Beam Test


CMS in a Muon Beam Test

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 in a Muon Beam Test

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
Trigger Architecture in a Muon Beam Test

  • Need Trigger System to filter out data


Cathode strip chambers csc
Cathode Strip Chambers (CSC) in a Muon Beam Test

  • Provide 3-D tracks of charged particles called Local Charge Tracks (LCT’s)


Level 1 trigger system
Level-1 Trigger System in a Muon Beam Test


Level 1 trigger system1
Level-1 Trigger System in a Muon Beam Test

  • 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
2004 Test Beam in a Muon Beam Test

  • 100GeV muons for asynchronous run

  • 100GeV pions for synchronous run (along with muons)


Alct trigger modes
ALCT Trigger Modes in a Muon Beam Test

  • Trigger Mode 0: Accelerator Pattern or Collision Pattern

  • Trigger Mode 1: Acc. Pattern Only

  • Trigger Mode 2: Collision Pattern Only

  • Trigger Mode 3: Acc. Or Coll. But Acc. Pattern vetoes Coll.

Coll. Pattern Acc. Pattern


Ghosts and di muons
Ghosts and Di-Muons in a Muon Beam Test

Ghosts

Di-muons

  • Occurs when 1 muon returns two LCT’s

  • Considered the same LCT if it occurs on the same strip AND differs by less than two wire groups

  • Is the converse of a Ghost

  • If two LCT’s are found and they don’t fit the definition of a Ghost, then it must be a TRUE di-muon


Ghost and di muon rates
Ghost and Di-Muon Rates in a Muon Beam Test

Di-muons Rates

Ghost Rates


Angle vs alct trigger mode
Angle vs. ALCT Trigger Mode in a Muon Beam Test


Different collision patterns
Different Collision Patterns in a Muon Beam Test



Number of layers required
Number of Layers Required? in a Muon Beam Test

There Are six possible layers

We can require any number of those six; the default is 4 out of six

This means that if any 4 of those layers matches then it is an LCT




Conclusions
Conclusions “Miss4” Pattern)

  • Miss4 has high efficiency and provides very good discrimination against collision vs. accelerator patterns

  • Other parameters varied: ALCT delay, with and without an iron block, old and new ALCT firmware


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