local performance of the local cathode strip chamber trigger in a muon beam test
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/1.jpg)
Local Performance of the Local Cathode Strip Chamber Trigger
in a Muon Beam Test
![Page 2: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/2.jpg)
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
![Page 3: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/3.jpg)
LHC
• 14 TeV center of mass energy• 27 km circumference
![Page 4: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/4.jpg)
CMS (Compact Muon Solenoid)
![Page 5: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/5.jpg)
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
![Page 6: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/6.jpg)
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
![Page 7: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/7.jpg)
Trigger Architecture
• Need Trigger System to filter out data
![Page 8: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/8.jpg)
Cathode Strip Chambers (CSC)
• Provide 3-D tracks of charged particles called Local Charge Tracks (LCT’s)
![Page 9: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/9.jpg)
Level-1 Trigger System
![Page 10: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/10.jpg)
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
![Page 11: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/11.jpg)
2004 Test Beam
• 100GeV muons for asynchronous run
• 100GeV pions for synchronous run (along with muons)
![Page 12: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/12.jpg)
ALCT Trigger Modes• 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
![Page 13: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/13.jpg)
Ghosts and 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
Ghosts
•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
Di-muons
![Page 14: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/14.jpg)
Ghost and Di-Muon Rates
Ghost Rates Di-muons Rates
![Page 15: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/15.jpg)
Angle vs. ALCT Trigger Mode
![Page 16: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/16.jpg)
Different Collision Patterns
![Page 17: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/17.jpg)
Coll. Pattern vs. ALCT Trigger Mode
![Page 18: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/18.jpg)
Number of Layers Required?
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
![Page 19: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/19.jpg)
Minimum Number of Layers Required vs. ALCT Trigger Mode (for “Miss4” Pattern)
![Page 20: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/20.jpg)
Ghost Rates for Miss4 Coll. Pattern
![Page 21: Local Performance of the Local Cathode Strip Chamber Trigger in a Muon Beam Test](https://reader035.vdocuments.us/reader035/viewer/2022070413/56814cf9550346895dba0d25/html5/thumbnails/21.jpg)
Conclusions
• 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