rpc upscope : an overview with indian perspective l. m. pant nuclear physics division bhabha atomic...
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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
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 29 th July 2010
666 cm
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
2011(?)
pseudorapidity, = - ln tan(/2) Is the polar angle of the particle wrt the beam axis
Longitudinal section of CMS
Trigger detectorRPC’s : both Barrel & End-Cap : = 0 to 2.1
Tracking detectorBarrel : Drift Tubes : = 0 to 1.2 End-cap : Cathode Strip Chambers : = 0.9 to 2.1
CMS
barrel
end-cap end-cap
L. M. Pant India-CMS Meeting, BARC 29 th July 2010
due to insufficient funding availability, only three layers were built in the endcap which provided a
limited rapidity coverage up to =1.6
barrel section in 5 wheels
=0 =1.2
=1.6
end-cap end-cap
China
Pakistan
L. M. Pant India-CMS Meeting, BARC 29 th July 2010
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 29 th July 2010
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 India-CMS Meeting, BARC 29 th July 2010
barrel section in 5 wheels
=0 =1.2
=1.6
end-cap end-cap
China
Pakistan India & Belgium
The key element of this proposal is to construct the 4th layer of RPCs in the endcap
L. M. Pant India-CMS Meeting, BARC 29 th July 2010
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 29 th July 2010
Second layer of gas-gaps with gas flow pipes
L. M. Pant India-CMS Meeting, BARC 29 th July 2010
Bakelite gas-gaps enclosed inside the Faraday Cage
L. M. Pant India-CMS Meeting, BARC 29 th July 2010
Fully assembled RPC with front end electronics, gas flow pipes, cooling pipes, HV and signal cables
L. M. Pant India-CMS Meeting, BARC 29 th July 2010
L. M. Pant India-CMS Meeting, BARC 29 th July 2010
Strip profile of cosmic events : 5K triggers
132
3364
6596
Not dead channels, problem with shift registers in the electronics
RPC # 6, run No. 5135, 5K triggers at 9.4 kV
L. M. Pant India-CMS Meeting, BARC 29 th July 2010
L. M. Pant India-CMS Meeting, BARC 29 th July 2010
L. M. Pant India-CMS Meeting, BARC 29 th July 2010
Expected financial contribution for low upgrade
18%
India
L. M. Pant India-CMS Meeting, BARC 29 th July 2010
~1000 kCHF per sector
( end caps)
~ 800 kCHF per sector
( end caps)
Cost per sector for low (RE2/2, RE2/3)
~ 1.2
~ 1.6
L. M. Pant India-CMS Meeting, BARC 29 th July 2010
L. M. Pant India-CMS Meeting, BARC 29 th July 2010
RPCs to be built for low upgrade 144 + 56 extra = 200
0
10
20
30
40
50
60
70
80
90
100
Belgium India
RE4/3
RE4/2
Belgium India 100 + 100 = 200 RPCs
L. M. Pant India-CMS Meeting, BARC 29 th July 2010
Chamber Assembly Sites
Type of chamber
No. of chambers
Asembly sites
RE4/2 40 BARC, Panjab
RE4/2 60 CERN – B904
RE4/3 40 Ghent
RE4/3 60 CERN – B904
Mumbai, Chandigarh
The manpower to run this facility will be provided by the respective institutes when their detectors are
being tested
L. M. Pant India-CMS Meeting, BARC 29 th July 2010
Responsibitities of each collaborating unit
L. M. Pant India-CMS Meeting, BARC 29 th July 2010
July’10
We are here
The road map
Oct ’10
Start up forproduction of
gas-gaps,mechanics,electronics
Dec ’10
Assembly sites to be ready
Dec ’11
Testing,Comissioning& CompleteInstallation
Aug ’10
HPL production
Gas-Gaps : production of 600 gas-gaps for 200 chambers would take about 12 months
HPL : 2 months are required for the production of
600 foils x (1620 x 3200 mm2) = 3110 m2
L. M. Pant India-CMS Meeting, BARC 29 th July 2010
Summary
• 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 29 th July 2010
• 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)
Outlook
L. M. Pant India-CMS Meeting, BARC 29 th July 2010