5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
CMS Barrel Resistive Plate Chambers -
from Assembly to Operation
ANTON DIMITROV
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
CMS
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Muon System
Barrel
5 Wheels (-2,-1,0,1,2)
12 Sectors
4 Stations (RB 1,2,3,4)
2 RPC in station
=> 480 Barrel chambers in total
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Resistive Plate Chambers
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Double Gap DesignSingle Gap
Single Gap
Readout strips
FW - up BW - up
FW - down BW - down
GAS GAP GAS GAP
GAS GAP GAS GAP
HV electrodes (graphite)
Bakelite
Signal Strips
Gas
-HV
-HV
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
RPC Test Overview
1) Cosmic Tests after chamber construction – Bari, Pavia, Sofia
2) Transportation to CERN – Quality test at ISR
3) Coupling – test after coupling
4) Test after transportation to SX5
5) Chamber Installation – Precommissioning test after installation
6) Final Cabling – test after final cabling
7) Lowering down the wheel – test after the lowering
8) LV Test after the cabling, test of DCS cables.
9) Tower Test
10) MTCC
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Barrel production
GTHT
Bari
Pavia
Sofia
ISR
Chamber Test Sites
RB1 in Pavia
RB2 & RB4 in Bari
RB3 in Sofia (& Bari)
120 RB1 at HT
240 RB2 and RB4 at GT
120 RB3 in Sofia (& Bari)
Double gap
GT
Chambers production and quality
certification involve several steps.
China
Single gap
Chamber Assembling Sites
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
1.RPC Tests with Cosmics
Trigger scintillator
Trigger scintillator
RPC
μ
1. Efficiency2. Cluster size3. Noise rate4. Dark Current
Main RPC Parameters:
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Trigger System - Bari
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Main RPC Parameters
Trigger scintillator
Trigger scintillator
RPC
μ
1. Efficiency2. Cluster size3. Noise rate4. Dark Current
Main RPC Parameters:
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
RPC Parameters
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
CMS Requirements
≤ 45 %Humidity
≤ 5 Hz/cm2Intrinsic Noise Rate
≥ 1 kHz/cm2Rate Capability
≥ 95 %Efficiency
≤ 2 nsTime Resolution
CMS RequirementsItem
≥ 300 VHV Plateau
≤ 10 %Streamer Probability
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
RPC Results 2006
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
RPC Results 2006
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
2.Transportation to CERN
ISR RPC storage and test area
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
2.Quality Tests at ISR Final dressing
Final cooling HV connectors Temperature sensors
Detector control Gas leak Threshold setting and reading Current vs. HV Long stability test (15-20 days @
9200 V) Gas input overpressure test
Performance Noise rate (cluster count.) vs. HV
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
RPC – current stability
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Noise rate performance
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
3.Coupling DT - RPC
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
4.Transportation to SX5
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Before Installation
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
5.Chamber Installation
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
5.Chamber Installation
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
5.Chamber Installation
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
5.After Installation
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
5.Test after Installation
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
5.Precommissioning at SX5
Gas system Commissioning of the
final gas distributor Gas line equalization
HV test Current vs HV,
current stability for 48 hours
LV test Thresholds
reading/writing Noise measurement Front-end electronics Strip connectivity
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Precommissioning Results
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Precommissioning Results
Initial Behaviour After the change of the HV connector
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Precommissioning Results
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Precommissioning Results
RB4++_down
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
6.Final Cabling
HV cablesLV cablesDCS cablesSignal cables
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Final Cabling Test
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
HV Cable Problem
Return wires
HV wires
shield
7,5 mm
Plastic jacket
shield
Al/PET
HV wires Slide by D. Piccolo
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
On detector HV cables Problem
First pre-production 40 cableswith correct connections. Starting from the final productionthe connections were inverted !!
gnd
HV wires (thicker) Return wires (thiner)
gndCorrectconnection
Test done at factory:- Continuity test pin to pin- HV test at 15 KV
gnd gnd
HV wires (thicker) Return wires
Wrongconnection
Slide by D. Piccolo
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Present Status
Produced ChambersProduced Chambers 485485
InstalledInstalled 462462
Ready for installationReady for installation 1818
ReinstalledReinstalled 33
SpareSpare 22
Chamber Production and Cosmic Ray Tests are finished!
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Tower Test
Newly established procedure for detector performance, using the final rpc/trigger system:
Strip Connectivity TestSignal Cable Check OutNoise rate as a function of HV and threshold.
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Noise histogram
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Strip Connectivity Test
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
MTCC
Magnet TestTest Magnet Functionality – cooling, supply, control systemsMagnet mapping
Cosmic ChallengeReading & Synchronization signals from all subdetectorsTest of the Muon System – RPC, DT, CSCTest of the “cosmic” triggerVerification of Chamber Performance
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
MTCC Phases
MTCC I – Local DAQ (Tracker, DT, RPC, CSC)Link Boards, Synchronization, Data TakingBarrel – One Sector (10) in Wheel+1 and One Sector (10) in Wheel+2
MTCC II – Global DAQ (Ecal, Hcal, DT, RPC and CSC included)Barrel – Two Sectors (10&11) in Wheel+2 and One Sector (10) in Wheel+1
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
MTCC Event
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Noise profile
Noisy FEB before threshold setting
The same FEB after setting of thresholdsPlots by Roselli
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Noise study for a single chamber
RB2IN-B wheel1-RB2IN-B wheel1-
Sector10Sector10
1.1. Noise distribution Noise distribution
calculated on the calculated on the
entire period of entire period of
the MTCC. the MTCC.
2.2. Noise ProfileNoise Profile
Figure 1
Including all the runsIncluding all the runs
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Preliminary Results – Local and Global
EfficiencyRPC
DT
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
MTCC Efficiency
Slide by Tupputi
HV at 50 % efficiency
DT-RPC alignment is needed
5 – 10 June 2007 Primorsko, Bulgaria
National ConferenceOn Particle Physics II
Anton Dimitrov
Conclusions Cosmic Ray Tests in Bari/Pavia/Sofia are
finished Chamber Production is finished 462 Chambers Installed in CMS 18 Chambers Ready for Installation All Five Wheels are fully precommissioned Tests in the underground cavern started Tower Test with the final rpc/trigger chain
initialized MTCC Data are being processed