performance of mb4 chambers giorgia mila sez. di torno
TRANSCRIPT
Performance Performance of MB4 of MB4
CHAMBERSCHAMBERS
GIORGIA MILA
Sez. di Torno
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Giorgia Mila
Sez. di Torno OVERVIEWOVERVIEW
Map of MB4 dead channelsMap of MB4 dead channels Inefficient cells & track angular Inefficient cells & track angular
distributionsdistributions– BTI + TRACO acceptance (new vs old BTI + TRACO acceptance (new vs old
configuration files)configuration files) On-going works :On-going works :
– EfficiencyEfficiency– ResolutionResolution
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sector-sector-stationstation TURINTURIN ISRISR COMMISSIONINCOMMISSIONIN
GG
CHAMBER_2_CHAMBER_2_44
------SL1 L3 w75SL1 L3 w75
SL1 L4 w30SL1 L4 w30
SL1 L4 w76SL1 L4 w76
SL1 L3 w75SL1 L3 w75
SL1 L4 w30SL1 L4 w30
SL1 L4 w76SL1 L4 w76
CHAMBER_3_CHAMBER_3_44
SL1 L1 w31
SL3 L2 w4------ ------
CHAMBER_5_CHAMBER_5_44
------ SL3 L1 w46SL3 L1 w46 SL3 L1 w46SL3 L1 w46
CHAMBER_6_CHAMBER_6_44
------ ------ ------
CHAMBER_8_CHAMBER_8_44
------ ------ ------
CHAMBER_12CHAMBER_12_4_4 ------ ------ ------
MB4 DEAD CELLS – WHEEL MB4 DEAD CELLS – WHEEL 22
These cells seem to have been repaired
•We have not found any information about it
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Sez. di Torno MB4 DEAD CELLS – WHEEL MB4 DEAD CELLS – WHEEL 11
sector-station TURIN ISR COMMISSIONING
CHAMBER_2_4CHAMBER_2_4 SL1 L4 w4 SL1 L4 w4
SL1 L1 w8,76,94SL1 L2 w83SL1 L4 w4
SL1 L4 w23
CHAMBER_3_4CHAMBER_3_4 ------ ------ ------
CHAMBER_6_4CHAMBER_6_4 ------ ------ ------
There are 5 new dead cells. we could not check the pulse files (the commissioning pc is down)
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Angular distribution Angular distribution
OLD vs NEW BTI OLD vs NEW BTI configurationconfiguration
HH+HL OLD
HH+HLNEW
The angular acceptance of the HH+HL trigger has improved (see the right side of the distribution)
This angular distribution is the convolution of :
• cosmic angular distribution
• BTI+TRACO angular acceptance
MB4 sector3
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BTI+TRACO acceptance BTI+TRACO acceptance
versus versus
cosmic angular distributioncosmic angular distribution
~35°
Correlated triggers
~-35°
from Muon TDR
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The Regular pattern in the occupancy plots (often related to distorted TB) seems to be strongly reduced!!
We are studing the angular dependence of this pattern
Occupancy Occupancy
OLD vs NEW BTI OLD vs NEW BTI configurationconfiguration MB4 sector3
HH+HL OLD
HH+HL NEW
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Sez. di TornoOccupancy – OLD BTI Occupancy – OLD BTI
configurationconfiguration
The pattern is present at all
angles
-60°<angle<-30°
30°<angle<60°-30°<angle<30°
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Strong angular dependence
Occupancy – NEW BTI Occupancy – NEW BTI configurationconfiguration
-60°<angle<-30°
30°<angle<60°-30°<angle<30°
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The problem is still present with the new BTI configuration :
• the effect is asymmetric is the asymmetry related to the effect of the staggering between the SLs on the TRACO ? (2 cells staggering for MB4)
• what is the origin of the 4 cell pattern?
NOTE :
The effect is present also in MB3 data taken with HH+HL trigger configuration
Open problemsOpen problems
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-30°<angle<-30°
angle>60°30°<angle<60°
Occupancy MB3 – NEW BTI Occupancy MB3 – NEW BTI configurationconfiguration
HH+HL
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Under study (I) Under study (I)
EFFICIENCYEFFICIENCY
Efficiency computed from segment extrapolation:
•count also hits not associated to the segment
Mean efficiency: 98.5%
• count only hits associated to the segment
Mean efficiency: 97.5%
We need to agree on details about the efficiency
calculation
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σ = 520 μmCalibration parameters to be optimized with :
• recipe for t0 subtraction
• vdrift calibration
Under study (II) Under study (II)
RESOLUTIONRESOLUTION
distance from the wire (cm)
Vdrift effect
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Test of ORCA reconstruction codeTest of ORCA reconstruction code
This is a good opportunity also to test the official reconstruction code (ORCA) on real data: plenty of features under investigation.
• Bug found in the Segment reconstruction• problems in RecHit update after segment fit in phi SLs: offset in z coordinate of segment position -> fix available
• Design problem for ORCA digis• the current implementation of digis fails if there are more than 8 digis in a cell -> need to apply a time window during digitization (important feedback for implementation in CMSSW)
• Problem in the RecHit caching (found by Philipp) -> still to be fixed but it has no effect on commissioning data