Optimization of the ATLAS Muon Detector Readout for high … · 2013. 7. 21. · Sebastian Ott...
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Optimization of the ATLAS Muon Detector Readout forhigh counting rates
Sebastian Ott
July 21, 2013
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Table of Contents
1 ATLAS-Detector at the LHC
2 The ATLAS Muon Detector
3 Optimization of the Moun Detector
4 Test of new electronics
5 Conclusions
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LHC
Proton-Protoncollision at7 - 8 TeV (2012)Aim of energyincrease:13 TeV (2015)Design luminosity:1034 cm−2s−1
(2015)Luminosityincrease to7*1034 cm−2s−1
(2023)
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ATLAS
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ATLAS Monitored Drift Tube (MDT)-Chamber
Tube diameter 30 mm(currently mounted)Gasmixture Ar/CO2 (93/7)Pressure: 3 barVoltage: 3080 VMax. drifttime: 700 nsNonlinear r-t-relationBackground rate capability:300 kHz/tube (500 Hz/cm2)
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Upcoming Requirements
Background:PhotonsNeutrons
Background∝ luminosity
Higher signal rates
⇒ In some regions the MDT-chambers will come to their limits
Rates in Hz/cm2
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Improvement of the MDT-Chambers - sMDTReducing the diameter to 15 mm
Shorter max. drifttime
⇒ Deadtime can be reduced⇒ Fewer masking effects
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Improvement of the MDT-Chambers - sMDTReducing the diameter to 15 mm
More tubes per chamber
⇒ Lower occupancy
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Improvement of the MDT-Chambers - sMDTReducing the diameter to 15 mm
Less space charge fluctuations
⇒ Better resolution
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Improvement of the MDT-Chambers - sMDT
e−-Ion-pairsFast e− signal isinterestingMultiple thresholdcrossings for one Muonpossible
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Signal Pile-Up
Large undershot from bipolarshapingShift of a second thresholdcrossingEven loss of second hit ispossibleEfficiency loss
⇒ Still more potential inthe sMDT
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Signal Pile-Up
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Signal Pile-Up
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Base Line Restauration
The aim is to get rid of the long signal tail
⇒ Negative signal part is unwantedSimplified idea:Insertion of a diode
⇒ Negative part is ’cut’ off⇒ Lower deadtime
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Testsetting
Testboard with BLR electronicsDelta pulse
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First Test of Readout Electronics with BLR
Rectangular signal from pulse generatorFeeding the input via capacitor
⇒ Delta pulse at the input of the electronic
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First Test of Readout Electronics with BLR
Only a small undershotFast base line restauration
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First Test of Readout Electronics with BLR
No pile-upNo loss of amplitude
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First Test of Readout Electronics with BLR
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First Test of Readout Electronics with BLR
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Conclusion and Summary
Signal pile-up lowers efficiencyShaping has to be improvedChip with BLR
Shows expected characteristicLowers deadtimeShortens the undershot
Test measurements on a chambersDevelopment of a new adjusted chip
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Thank you for your attention
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