CMS Endcap Resistive Plate Chambers

Andrey Marinov

On Behalf Of

CMS Collaboration.

NCPP 2007

• CERN

NCPP 2007

Compact Muon Solenoid

Endcaps

NCPP 2007

NCPP 2007

Endcap RPC Schema

Final Gas mixture used in all tests95.5 Freon 3.5 Isob 0.3 SF6 + RH 50% = 5000 ppm

NCPP 2007

Electrical Schema

• 96 Channels. 3 sectors, 32 each

• Standard LVDS output

• Controlling and monitoring of FEB threshold

• Monitoring of FEB temperature

NCPP 2007

BakelitePurchase Italy

Cut Clean Ship to Korea

Gaps Built in Seoul QC Ship to CERN

FEBs, Adaptor / DistributionBoards

Procure from ItalyOrder from Pakistan

Test in Italy Ship to CERN

Chamber Assembly

ISR Lab @ CERN QC Construction Database

Storage @ X5 Installation@SX5ProductionDatabase (CMS)

Mechanics Kit prep in China Procurement Cables and pieces

Shipped to CERN

Production Flow Process

http://cern.ch/cms-isr-endcap-rpchttp://cern.ch/rpc-endcap

CommissioningCOM1 & COM2

Dec 2003

Dec 2004

NCPP 2007

Production Of HV Gaps

KODEL

KODEL

•

• Seul – South Korea

NCPP 2007

The Assembly Lab At CERN - ISRGap QCChamber QC

NCPP 2007

http://cern.ch/cms-isr-endcap-rpc

Some Technological Steps

NCPP 2007

Testing Of Endcap RPC with Cosmic Rays

• Cosmic Stand.

NCPP 2007

Trigger ConfigurationCounters Setup

NCPP 2007

TriggerElectronics Setup

NCPP 2007

DAQ

Run Signal

Recording

EnableTrigger

RecordingStop recording

Reading the TDCs

NCPP 2007

Cosmic Test ComputingDAQ PC Database PC

MXI bus

TCP/IP

TCP/IP

Tracking PC

CAEN 1527HV power supply

TCP/IP

I2C MultiplexerFor slow control

RS232

Control PC

NCPP 2007

Cosmic Test DataStrips Profile

Strips Profile taken with only 2 scintilators from the top and bottom layers.

NCPP 2007

Cosmic Test DataStrips Profile

Including a small 50cm counter.

NCPP 2007

Cosmic Test DataTime Distribution

NCPP 2007

Cosmic Test Noise Profile

triggers

noisenoiserate N

NN

stripratestrips

noiserate NN

/32

Noise and Time distribution

Time bins 0-128 (1bin is 10ns)

Counts400ns

60ns

Noise

Noise

]/[]/[

]/[

22

2

1

1.

1.

cmHzcmHz

runstripsnoisecmHz

R

TSNR

239

119

NCPP 2007

Efficiency and Cluster Size

Scanning for efficiency and cluster size on a different voltages [8kv-9.6kv]

NCPP 2007

Cosmic Stand – Muons Tracking

NCPP 2007

HV Long Term Monitoring

Take sample of the current of each 2 minutes.

Take sample of the environmental conditions at the same time

NCPP 2007

Endcap RPC Databasehttp://forwardrpc.cern.ch/cms_forward_rpc/index.htm

Online • HV monitoring and QC IV

data storage• Searchable tracking for

individual Gaps / Chambers

• Production QC procedures • Mechanics• Cosmic Tests

VISIBLESEARCHABLEWORLDWIDE

Chamber QC data Gas gaps QC data

Environment conditions data

DATABASE

Production data

Results form Cosmic Test

NCPP 2007

SX5 – CMS home

Cessy – France

NCPP 2007

CMS YB-1

NCPP 2007

YB+2 Lowering In CMS Cavern

NCPP 2007

Future Plans

• Set Up the endcap RPC readout and controlling – Link Boards and Control Boards

• Lowering the YB-1 – probably in the end of 2007.

• Starting the LHC – 2008

NCPP 2007

Thank You For Your Attention

• For more details about CMS

http://cms.cern.ch