Update on pion and muon showers
description
Transcript of Update on pion and muon showers
![Page 1: Update on pion and muon showers](https://reader036.fdocuments.net/reader036/viewer/2022081513/5681614d550346895dd0d304/html5/thumbnails/1.jpg)
Update on pion and muon showers
Erik van der Kraaij& Przemyslaw Majewski
CERN LCDMay 17, 2010
![Page 2: Update on pion and muon showers](https://reader036.fdocuments.net/reader036/viewer/2022081513/5681614d550346895dd0d304/html5/thumbnails/2.jpg)
Problems from last meeting
• Distributions of hit distance to PFO direction with ‘weird’ peaks.
• Why are the hits in the muon chambers so far away? And so many per chamber?
• How come there is a (low) energy dependent calorimeter leakage to the muon system?
Erik van der Kraaij, CERN LCD 2
![Page 3: Update on pion and muon showers](https://reader036.fdocuments.net/reader036/viewer/2022081513/5681614d550346895dd0d304/html5/thumbnails/3.jpg)
Hit distances• Weird peaks were caused
by vector/array problems.
Distributions are now as can be expected.
• Coarser granularity of hCal compared to eCal– eCal distr peaks at
~20mm,– hCal distr peaks at
~50mm.• Difference between old
and new muon geometry is caused by material used. – Old: RPCgas– New: scintillator.
Erik van der Kraaij, CERN LCD 3
![Page 4: Update on pion and muon showers](https://reader036.fdocuments.net/reader036/viewer/2022081513/5681614d550346895dd0d304/html5/thumbnails/4.jpg)
Hit distances• Weird peaks were caused
by vector/array problems.
Distributions are now as can be expected.
• Coarser granularity of hCal compared to eCal– eCal distr peaks at ~3mm,– hCal distr peaks at
~13mm.• Difference between old
and new muon geometry is caused by material used. – Old: RPCgas– New: scintillator.
Erik van der Kraaij, CERN LCD 4
![Page 5: Update on pion and muon showers](https://reader036.fdocuments.net/reader036/viewer/2022081513/5681614d550346895dd0d304/html5/thumbnails/5.jpg)
Calorimeter LeakageProblem was caused by crack.• Each 22.5° there is a steel
plate in the r-z plane between two hCal modules.
• But: the gap was AIR, not steel in the Mokka simulation.
• Because of the 10mrad Lorentztransformation in the settings for the beamcrossing angle a neutral particle shot at 45° in the transverse plane does not go through the crack.
• Charged particles in a certain energy range can exactly make it.
Erik van der Kraaij, CERN LCD 5
hCal modules Track of a neutral particle shot at 45°
Gap, which should have been steel
![Page 6: Update on pion and muon showers](https://reader036.fdocuments.net/reader036/viewer/2022081513/5681614d550346895dd0d304/html5/thumbnails/6.jpg)
Calorimeter LeakageProblem was caused by crack.• Each 22.5° there is a steel
plate in the r-z plane between two hCal modules.
• But: the gap was AIR, not steel in the Mokka simulation.
• Because of the 10mrad Lorentztransformation in the settings for the beamcrossing angle a neutral particle shot at 45° in the transverse plane does not go through the crack.
• Charged particles in a certain energy range can exactly make it.
Erik van der Kraaij, CERN LCD 6
hCal modules Track of a 100 GeV muon shot at 45°
Gap, which should have been steel
![Page 7: Update on pion and muon showers](https://reader036.fdocuments.net/reader036/viewer/2022081513/5681614d550346895dd0d304/html5/thumbnails/7.jpg)
Calorimeter LeakageProblem was caused by crack.• Each 22.5° there is a steel
plate in the r-z plane between two hCal modules.
• But: the gap was AIR, not steel in the Mokka simulation.
• Because of the 10mrad Lorentztransformation in the settings for the beamcrossing angle a neutral particle shot at 45° in the transverse plane does not go through the crack.
• Charged particles in a certain energy range can exactly make it.
Erik van der Kraaij, CERN LCD 7
hCal modules Track of a 250 GeV muon shot at 45°
Gap, which should have been steel
![Page 8: Update on pion and muon showers](https://reader036.fdocuments.net/reader036/viewer/2022081513/5681614d550346895dd0d304/html5/thumbnails/8.jpg)
Calorimeter LeakageProblem was caused by crack.• Each 22.5° there is a steel
plate in the r-z plane between two hCal modules.
• But: the gap was AIR, not steel in the Mokka simulation.
• Because of the 10mrad Lorentztransformation in the settings for the beamcrossing angle a neutral particle shot at 45° in the transverse plane does not go through the crack.
• Charged particles in a certain energy range can exactly make it.
Erik van der Kraaij, CERN LCD 8
hCal modules Track of a 350 GeV muon shot at 45°
Gap, which should have been steel
![Page 9: Update on pion and muon showers](https://reader036.fdocuments.net/reader036/viewer/2022081513/5681614d550346895dd0d304/html5/thumbnails/9.jpg)
pions shot at φ = 45° , η = 0.21 – AIR GAP
Erik van der Kraaij, CERN LCD 9
(New muon system geometry) Sample of 5000 pions
![Page 10: Update on pion and muon showers](https://reader036.fdocuments.net/reader036/viewer/2022081513/5681614d550346895dd0d304/html5/thumbnails/10.jpg)
pions shot at φ = 45° , η = 0.21 – STEEL GAP
Erik van der Kraaij, CERN LCD 10
(New muon system geometry) Sample of 1200 pions
![Page 11: Update on pion and muon showers](https://reader036.fdocuments.net/reader036/viewer/2022081513/5681614d550346895dd0d304/html5/thumbnails/11.jpg)
pions shot in all φ directions, η = ~0.21
Erik van der Kraaij, CERN LCD 11
(New muon system geometry) Sample of 1000 pions
![Page 12: Update on pion and muon showers](https://reader036.fdocuments.net/reader036/viewer/2022081513/5681614d550346895dd0d304/html5/thumbnails/12.jpg)
pions shot in all φ directions, η = ~0.21
Erik van der Kraaij, CERN LCD 12
(Old muon system geometry) Sample of 1000 pions
![Page 13: Update on pion and muon showers](https://reader036.fdocuments.net/reader036/viewer/2022081513/5681614d550346895dd0d304/html5/thumbnails/13.jpg)
muons shot in all φ directions, η = ~0.21
Erik van der Kraaij, CERN LCD 13
(New muon system geometry) Sample of 2000 muons
![Page 14: Update on pion and muon showers](https://reader036.fdocuments.net/reader036/viewer/2022081513/5681614d550346895dd0d304/html5/thumbnails/14.jpg)
muons shot in all φ directions, η = ~0.21
Erik van der Kraaij, CERN LCD 14
(Old muon system geometry) Sample of 2000 muons