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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Sez. di Torno

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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Sez. di Torno

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