CMS Barrel Resistive Plate Chambers - from Assembly to Operation

5 – 10 June 2007 Primorsko, Bulgaria

National ConferenceOn Particle Physics II

Anton Dimitrov

CMS Barrel Resistive Plate Chambers -

from Assembly to Operation

ANTON DIMITROV

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

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Resistive Plate Chambers

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Double Gap DesignSingle Gap

Single Gap

Readout strips

FW - up BW - up

FW - down BW - down

GAS GAP GAS GAP

HV electrodes (graphite)

Bakelite

Signal Strips

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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

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Barrel production

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

Chambers production and quality

certification involve several steps.

Single gap

Chamber Assembling Sites

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1.RPC Tests with Cosmics

Trigger scintillator

1. Efficiency2. Cluster size3. Noise rate4. Dark Current

Main RPC Parameters:

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Trigger System - Bari

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Main RPC Parameters

Trigger scintillator

1. Efficiency2. Cluster size3. Noise rate4. Dark Current

Main RPC Parameters:

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RPC Parameters

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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

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RPC Results 2006

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RPC Results 2006

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2.Transportation to CERN

ISR RPC storage and test area

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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

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RPC – current stability

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Noise rate performance

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3.Coupling DT - RPC

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4.Transportation to SX5

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Before Installation

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5.Chamber Installation

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5.After Installation

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5.Test after Installation

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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

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Precommissioning Results

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Initial Behaviour After the change of the HV connector

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RB4++_down

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6.Final Cabling

HV cablesLV cablesDCS cablesSignal cables

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Final Cabling Test

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HV Cable Problem

Return wires

HV wires

shield

7,5 mm

Plastic jacket

shield

Al/PET

HV wires Slide by D. Piccolo

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On detector HV cables Problem

First pre-production 40 cableswith correct connections. Starting from the final productionthe connections were inverted !!

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

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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!

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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.

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Noise histogram

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Strip Connectivity Test

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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

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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

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MTCC Event

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Noise profile

Noisy FEB before threshold setting

The same FEB after setting of thresholdsPlots by Roselli

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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

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Preliminary Results – Local and Global

EfficiencyRPC

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MTCC Efficiency

Slide by Tupputi

HV at 50 % efficiency

DT-RPC alignment is needed

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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

CMS Barrel Resistive Plate Chambers - from Assembly to Operation

Documents

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