L. M. Pant India CERN Meeting, BARC, 28/02/11 1

Different components come to a meeting table with common interests

Each component goes backwith certain benefits

Mutual beneficial programmes are defined

Spirit of any successful collaboration

L. M. Pant India CERN Meeting, BARC, 28/02/11 2

The CMS-RPC collaboration

India-based Neutrino ObservatorySeparate talk by spokesperson, Naba Mondal

27,000 RPCs

Compact Muon Solenoid Experiment, CERN

1000 RPCs

Muon : central to bothRPCs : detector element

Resistive Plate ChambersLarge area coverage (each 2-4 m2)Excellent time resolution ( 2 ns)Count rate capability ( kHz / cm2)

Art of fabricationHandling (each 60 -70 kg)Long term performanceAssociated gas handlingDetector managementStill learning ……

RPC Lab. @ NPD-BARC, Mumbai

L. M. Pant 3India CERN Meeting, BARC, 28/02/11

India-CMS-RPC collaboration :1. Nuclear Physics Division, BARC, Mumbai &2. Panjab University, Chandigarh

Cosmic stand for leakage current & efficiency measurements

Leakage current vs. HV measurements for gas-gaps at NPD-BARC, Mumbai

L. M. Pant 4India CERN Meeting, BARC, 28/02/11

Fully assembled RPC with front end electronics, gas flow pipes, cooling pipes, HV and signal cables at

NPD-BARC, Mumbai

L. M. Pant 5India CERN Meeting, BARC, 28/02/11

RPC Box from India, entering the ISR Lab. in CERN : Jul 08

The ten RPCs : INTACT

RPC consignment from India (10 RPCs) : 866 kgMumbai to Geneva : July 2008

L. M. Pant 9India CERN Meeting, BARC, 28/02/11

7

Efficiency plots for eight chambers measured in ISR Lab., with the cosmic hodoscope

> 95%

OperatingRange ?

Not corrected for T & PThreshold ~ 200 mV

L. M. Pant India CERN Meeting, BARC, 28/02/11

the 4th layer is in between = 1.2 and 1.6

simulated trigger efficiency plot : Piet Verwilligen

= 1.24 = 1.42

small dips are due to an interface between different rolls in one chamber

L. M. Pant 8India CERN Meeting, BARC, 28/02/11

Longitudinal section of CMS

Present end-cap

RPC coverage

upto 3 layers

RPCs are segmented in strips of x ~ 0.1 x (5/16)o which makes possible a pT measurement of ~ 50 GeV

High regionFRPC upgrade

2016(?)

pseudorapidity, = - ln tan(/2) Is the polar angle of the particle wrt the beam axis

CMS

barrelend-cap end-cap

L. M. Pant 9India CERN Meeting, BARC, 28/02/11

L. M. Pant 10India CERN Meeting, BARC, 28/02/11

RE4/2 sector : 2 end caps x 36 chambers + spares = 100 chambers

Belgium India CERN Italy China Korea Pakistan Egypt0

100

200

300

400

500

600

700

800

900

The groups involved with financial contributionsk

CHF

→

figures relative to CERN and Italy are only estimates on the basis of the responsibility matrix, but no formal agreement exists

L. M. Pant 11India CERN Meeting, BARC, 28/02/11

RPC assembly sites

Type of chamber

No. of chambers

Asembly sites

RE4/2 40 India

RE4/2 60 CERN – 904

RE4/3 40 Ghent

RE4/3 60 CERN – 904

The manpower to run this facility will be provided by the respective institutes when their detectors are

being tested

L. M. Pant 12India CERN Meeting, BARC, 28/02/11

Prototype assembly of RE4 chambers(positive results → green signal for mass production)

1. Validation of bakelite quality a. Surface smoothnessb. Bulk resistivity

2. Validation of gas gap fabrication proceduresa. mechanical and electrical QCsb. gluing of gapsc. bonding strength of spacersd. efficiency in a cosmic hodoscope

L. M. Pant 13India CERN Meeting, BARC, 28/02/11

L. M. Pant 14India CERN Meeting, BARC, 28/02/11

Assembly of first prototype for RE4 station at ISR lab, CERN

L. M. Pant 15India CERN Meeting, BARC, 28/02/11

18 Nov 2010 : Efficiency plot of first RE4 chamber

Prototype assembly RE4 station : Outlook1. Further assembly scheduled at CERN in March 2011 where all the

participating institutes will evolve a common assembly / testing procedures

2. Assembly sites :a. in India - fully functional at Mumbaib. cosmic hodoscope mid 2011c. MDPDD-BARC is involved in a major way for fabrication of various components

d. Panjab University, Chandigarh is also gearing up as an additional sitee. Ghent assembly site to be functional soon cosmic hodoscope mid 2011f. 904 assembly site to be ready mid 2011

L. M. Pant 16India CERN Meeting, BARC, 28/02/11

RPC Upscope : the road map

Oct’10

First RE4chamber

assembled

Mar ’11

MassProduction of gas-gaps,mechanics,electronics

Jun ’11

Assembly of chambers

at sites

Dec ’11

Testing,Comissioning& CompleteInstallation

Dec ’10

Validation & go aheadfor bakeliteproduction

This of course depends, if the shutdown is in 2012 ?

L. M. Pant 17India CERN Meeting, BARC, 28/02/11

Acknowledgements

1. Atul Gurtu, TIFR2. V. C Sahni, BARC3. S. Kailas, BARC4. Naba Mondal, TIFR5. R. K. Choudhury, BARC6. Archana Sharma and the staff at CERN7. CDM, MDPDD, Spectroscopy Div., at BARC8. Staff and students from Panjab University, Chandigarh

L. M. Pant 18India CERN Meeting, BARC, 28/02/11

Looking further : possible upgrades : GEMs

L. M. Pant 19India CERN Meeting, BARC, 28/02/11

GEMs being exposed to muon beams at CERN

1. EoI for GEM upgrade (1.6 < < 2.1) : Sept. 2010

2. Local industry being looked into for GEM fabrication

3. GEM testing facility has been set up at NPD-BARC

4. GEM foils from CERN characterised : pitch and hole diameter

5. Gaseous etching of polymide surface being set up

6. CERN support : GEM electronics and consolidating the program