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RPC Upscope : An overview with Indian perspective. L. M. Pant Nuclear Physics Division Bhabha Atomic Research Centre. L. M. Pant India-CMS Meeting, BARC 29 th July 2010.

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Rpc upscope an overview with indian perspective

RPC Upscope :

An overview with Indian perspective

L. M. Pant

Nuclear Physics Division

Bhabha Atomic Research Centre

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

The first level trigger based on the RPCs provides CMS with the most precise timing in both the barrel and endcap region

Six concentric layers of chambers are used in the barrel part, while

four layers have been foreseen in total for the end caps to cover a rapidity up to =2.1

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

barrel the most precise timing in both the barrel and endcap region

end-cap

end-cap

CMS

Present

end-cap

RPC

coverage

upto

 3 layers

High  region

FRPC upgrade

2011(?)

666 cm

Longitudinal section of CMS

pseudorapidity,  = - ln tan(/2)

 Is the polar angle of the particle wrt the beam axis

Trigger detector

RPC’s : both Barrel & End-Cap :  = 0 to 2.1

Tracking detector

Barrel : Drift Tubes :  = 0 to 1.2

End-cap : Cathode Strip Chambers :  = 0.9 to 2.1

RPCs are segmented in strips of   x   ~ 0.1 x (5/16)o

which makes possible a pT measurement of ~ 50 GeV

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

the most precise timing in both the barrel and endcap region=0

due to insufficient funding availability, only three layers were built in the endcap which provided a limited rapidity coverage up to =1.6

=1.2

=1.6

China

end-cap

end-cap

barrel section in 5 wheels

Pakistan

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

chambers could be constructed later on so that coverage of the full rapidity range of the original design could be achieved

The key element of this proposal is to construct the 4th layer of RPCs in the endcap

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

simulated trigger efficiency plot : Piet Verwilligen the full rapidity range of the original design could be achieved

the 4th layer is in between  = 1.2 and 1.6

small dips are due to an interface

between different

rolls in one chamber

 = 1.24

 = 1.42

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

The key element of this proposal is to construct the 4th layer of RPCs in the endcap

=0

=1.2

=1.6

China

end-cap

end-cap

barrel section in 5 wheels

Pakistan

India & Belgium

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

CMS has decided to split the up-scope project into two distinct phases :

Phase 1 :

completion of the low  part ( < 1.6)

Phase 2 : (earlier called as upgrade)

completion of the high part (1.6 <  < 2.1)

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

Second layer of gas-gaps with gas flow pipes distinct phases :

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

Bakelite gas-gaps enclosed inside the Faraday Cage distinct phases :

April '2008

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

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

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

96 Meeting, BARC 29

65

64

33

32

1

Not dead channels, problem with shift registers in the electronics

Strip profile of cosmic events : 5K triggers

RPC # 6, run No. 5135, 5K triggers at 9.4 kV

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

presented during RPC-2010 at GSI Meeting, BARC 29

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

presented during RPC-2010 at GSI Meeting, BARC 29

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

Expected financial contribution for low Meeting, BARC 29 upgrade

4.5 MCHF

18%

India

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

~1000 kCHF Meeting, BARC 29

per sector

( end caps)

~ 800 kCHF

per sector

( end caps)

 ~ 1.2

 ~ 1.6

Cost per sector for low  (RE2/2, RE2/3)

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

RPCs to be built for low Meeting, BARC 29 upgrade

144 + 56 extra = 200

BelgiumIndia

100 + 100 = 200 RPCs

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

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

Chamber Assembly Sites

Mumbai,

Chandigarh

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

Responsibitities of each collaborating unit respective institutes when their detectors are being tested

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

July’10 respective institutes when their detectors are being tested

Aug ’10

Oct ’10

Dec ’10

Dec ’11

We

are here

HPL production

Start up for

production of

gas-gaps,

mechanics,

electronics

Assembly sites

to be ready

Testing,

Comissioning

& Complete

Installation

The road map

HPL : 2 months are required for the production of

600 foils x (1620 x 3200 mm2) = 3110 m2

Gas-Gaps : production of 600 gas-gaps for 200

chambers would take about 12 months

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

Summary respective institutes when their detectors are being tested

  • Ten RPCs sent to CERN are certified “Cosmic test OK”

  • RPC lab., at NPD-BARC is fully equipped to undertake

  • the assembly and testing following the QA/QCs as set by

  • CMS-RPC group

  • The Panjab University RPC lab is also equipped

  • with a 4-channel gas-mixing unit,

  • DAQ for the Cosmic Ray test,

  • scintillator hodoscopes,

  • mechanical and electrical workshops,

L. M. Pant India-CMS Meeting, BARC 29th July 2010


Rpc upscope an overview with indian perspective

Outlook respective institutes when their detectors are being tested

  • A/C with dehumidifiers for the RPC lab. at NPD-BARC

  • (civil work to start; commissioning by Dec. 2010)

  • Large area scintillator (18 cm x 200 cm) paddles for chamber

  • efficiency, cluster size and strip profile measurements

  • (to be ready by Nov. 2010)

  • VME based DAQ for 96 channels to measure all physical working

  • parameters for the chambers

  • (operational by March 2011)

  • Once the chambers are assembled, a complete test with a

  • cosmic hodoscope will be performed before the transportation

  • to CERN

  • Fabrication of a new cosmic rack (ready by Dec 2010)

  • the present cosmic rack to be used as a storage device

  • The Panjab University RPC lab. is also ready

  • (fully functional by Dec., 2010)

L. M. Pant India-CMS Meeting, BARC 29th July 2010