testing and quality certification for endcap resistive plate chambers for cms experiment at cern

NEC Varnasep 12-18, 2005

A. Marinov

Andrey Marinov On behalf of the CMS Forward RPC Collaboration

Y. Ban, J. Cai, H. Liu, S. Qian, Q. Wang, Y. Ye, J. Ying, Yucheng Ge - Peking University, Beijing, China

B. Hong , S. J. Hong , K. S. Lee, S. Park, K. S. Sim - KODEL, Seoul, S. KoreaA. Ball, J-P. Chatelain, I. Crotty, A. Sharma, W. Whitaker - CERN, Geneva, Switzerland

W. Van Doninck - Vrije Universiteit Brussel, Brussels, BelgiumS. Akimenko - IHEP, Protvino, Russia

L. Litov, A. Marinov - University of Sofia, Sofia, BulgariaA. Devlieger – University of Victoria, Victoria, Canada

M. I. Asghar, I. Ahmed, H. Hoorani - National Centre for Physics, Quaid-i-Azam University Campus, Islamabad, Pakistan

Z. Aftab, M. S. Khan, T. Solaija - Pakistan AtomicEnergy Commission, Islamabad, PakistanA. Colaleo, G. Iaselli, F. Loddo, M. Maggi - INFN Bari, Itlay

B. Michal Marcisovsky Samuel Scheonholz Rene Kuo Manohar Jonnalagedda CERN Geneva

2NEC Varnasep 12-18, 2005

A. Marinov

CMS Detector

Endcaps

3NEC Varnasep 12-18, 2005

A. Marinov

FORWARD Resistive Plate Chambers

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

4NEC Varnasep 12-18, 2005

A. Marinov

Forward RE Resistive Plate Chambers

• 96 Channels. 3 sectors by 32 strips A ,B, C

• Standard LVDS output

• Slow Control for Threshold and temperature measurements for each F.E.B.

5NEC Varnasep 12-18, 2005

A. Marinov

Testing RE with Cosmics

• Cosmic stand.Top and Bottom layers

scintilators.

Possibility to put 10 chambers inside to test them with cosmics

6NEC Varnasep 12-18, 2005

A. Marinov

Cosmic Stand Trigger

Counters Setup

7NEC Varnasep 12-18, 2005

A. Marinov

Cosmic Stand TriggerElectronics Setup

8NEC Varnasep 12-18, 2005

A. Marinov

Cosmic Stand Data Acquisition

Run Signal

Recording

EnableTrigger

RecordingStop recording

Reading the TDCs

9NEC Varnasep 12-18, 2005

A. Marinov

Main VME Frame

10NEC Varnasep 12-18, 2005

A. Marinov

Data Format From the TDC

64 bit channel information1 time bin is 10ns

1 1 1

128 bit presenting the time information from each TDC

64 bit channel information

64 bit channel information

0 0 0 0… …

11NEC Varnasep 12-18, 2005

A. Marinov

Software and Computing

DAQ PC Database PC

MXI bus

TCP/IP

TCP/IP

Tracking PC

CAEN 1527HV power supply

TCP/IP

I2C MultiplexerFor slow control

RS232

Control PC

12NEC Varnasep 12-18, 2005

A. Marinov

Software and ComputingDAQ PC

MXI bus

Pentium 4 1.6 GHz512Mb RAM120GB HDD

Linux PlatformUsing standard drivers from National Instruments for the MXI/PCI controller.

Running Software Offline Analyses Software

Online Tracking engine

13NEC Varnasep 12-18, 2005

A. Marinov

Data From Cosmic TestStrips Profile

Using only 2 scintilators from the top and 2 form the bottom layer

14NEC Varnasep 12-18, 2005

A. Marinov

Data From Cosmic TestStrips Profile

Coincidence with 2 scintilators from top, 2 from bottom and small counter placed on sector B.

15NEC Varnasep 12-18, 2005

A. Marinov

Data From Cosmic Test

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

16NEC Varnasep 12-18, 2005

A. Marinov

Data From Cosmic TestTime Distribution

17NEC Varnasep 12-18, 2005

A. Marinov

Data From Cosmic StandEfficiency and Cluster Size

Scanning for efficiency and Cluster size values at different voltages.

18NEC Varnasep 12-18, 2005

A. Marinov

Online Tracking Software

19NEC Varnasep 12-18, 2005

A. Marinov

Continuously H.V. MonitoringRecording the HV currents every 2 min, and store the data in to the Database.

Including the environment conditions. Temperature and Humidity

20NEC Varnasep 12-18, 2005

A. Marinov

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

21NEC Varnasep 12-18, 2005

A. Marinov

Quality Control and Certification for CMS installation

• Checklists are included in all production steps• Quality control and measurements for the gaps• Cosmic Test Data for Noise, Strips Profile, Efficiency, Cluster Size, HV monitoring, Environment conditions.

Certification file for each Endcap RPC Detector

22NEC Varnasep 12-18, 2005

A. Marinov

Summary and Future

Summary•All tests and QC for RE chambers are set up.•100 chambers (RE) are Quality Certificated and ready for Installation in CMS experiment•Production and QC processes are in time.

To do•Optimizing the tracking software