RPC Upgrade for the CMS experiment L. M. Pant Nuclear Physics Division Bhabha Atomic Research Centre, Mumbai 1
Restoration of the full TDR, RE4 ( ) Present experiment runs with 3 endcaps 2
one of the end cap under installation : 72 RPCs / end cap Type 2 chambers Type 3 chambers 3
RE4/2 = 72 RE4/3 = 72 Spares RPC = 56 Total no. of RPCs = 200 RPCs NPD BARC, Mumbai & Panjab University, Chandigarh CERN India Belgium 4
Arrival of mechanics : Feb 2012 Engineering support from MDPDD VME DAQ and TDCs The road map : 2012 2014 RPC budget Signals from single GEM foil L. M. Pant 5 India CMS Meeting, BARC, 03 Aug 12
Two wooden packages being offloaded from the truck 24 th February 2012 at NPD BARC L. M. Pant 6 India CMS Meeting, BARC, 03 Aug 12
Honey Comb Panels stacked at Mumbai site : 25 sets Retrofitting need to be done 7
Cu Faraday with mylar, Cu Read Out Strips, Screen Covers stored in shelves Platform for mylar cutting Cu Faraday with Mylar : 25 sets Cu Read Out Strips : 50 sets Screen Covers : 25 sets 8
Leak and Spacer test facility at NPD BARC, Mumbai Bottom Gap of RE*/2 type from old stock (2007) 20 cm 20 mbar of overpressure with water column 9
Pressure Transducer : Sensor Technics (CTE7000) with a 20 bit ADC Picolog (20 mbar of overpressure) Leak rate : 2.3 x 10 4 mbar. litre / sec bottom gap of RE*/2 type mbar 19.4 19.35 19.3 19.25 y = 0.0001x + 19.687 R² = 0.9681 Series1 Linear (Series1) 102 intact spacers in a bottom gap of RE*/2 type non spacer region 19.2 19.15 3000 3500 4000 4500 5000 sec 10
Arrival of mechanics : Feb 2012 Engineering support from MDPDD VME DAQ and TDCs The road map : 2012 2014 RPC budget Signals from single GEM foil L. M. Pant 11 India CMS Meeting, BARC, 03 Aug 12
Aluminum patch panels fabricated for 200 chambers Responsible : Manish Kumar, MDPDD BARC 12
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Cu plates (DHP) cutting, bending and drilling : BARC, Mumbai DHP copper being used for the plates and pipes (semi hard) DHP : Deoxidized High Residual Phosphorous 14
Cu pipes (semi hard) soldered to Cu plates (Sn : Ag : Pb :: 62 : 2 : 36 @ 200 o C) MDPDD BARC, Mumbai Cu cooling set on jig while soldering Finished product (for type RE4/3) undergoes leak test with Argon at 20 bar 15
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Cu cooling system for 200 chambers Cu cooling circuits for the first 30 chambers under fabrication at Mumbai : RE4/2 type 10 sets for Mumbai Being fabricated RE4/3 type 05 sets for CERN & Completed RE4/2 type 05 sets for CERN & Being fabricated RE4/3 type 10 sets for Ghent Completed Delivery to CERN and Ghent expected by end September 2012 Fabrication of remaining 170 sets, to be completed in a phased manner, by end March 2013 17
Leak test of Cu cooling system @ NPD BARC Pressure transducer Temp and RH sensor 18
Outlet Pressure 20 bar Inlet pressure 80 bar Safety release 0 35 bar pressure transducer Argon gas Cu tube pinched at one end 19
Leak test of Cu system RE4/3 001 at NPD BARC 05 April 2012 30 minutes data Pressure (bar) Time (sec) 20
Pressure (bar) and Temperature ( o Celsius) 25 20 15 10 5 0-5 Leak test of Cu system RE4/3 001 at NPD BARC 05 April 2012 30 minutes data Time (data points for each minute) Pressure Temp 21
Plexi glass spacers for guiding the coaxial cables only for 50 RE4/2 chambers being built in India 22
Transportation trolley for ten RPCs Total weight for 10 RPCs : 800 kg Gross weight : 1000 kg 23
Arrival of mechanics : Feb 2012 Engineering support from MDPDD VME DAQ and TDCs The road map : 2012 2014 RPC budget Signals from single GEM foil L. M. Pant 24 India CMS Meeting, BARC, 03 Aug 12
RPC characterization software We are waiting for the final version to be confirmed from CERN for implementation at BARC Hodoscope set for simultaneous testing of three RPCs and three gas gaps for HV scan 3 x V1190A, 128 multihit TDCs implemented in the software The signals from scintillators and the trigger also implemented in the software HV scripts being tested for stability tests : 120 h Minor bugs to be rectified 25
VME based DAQ 1 x CAEN V2718 VME bridge 3 x TDC modules CAEN V1190A 128 LVDS input channels The flat cables from 3 RPCs mate with the flat cables from TDC on a patch panel 26
2D plot : Timing (ch # X axis) vs TDC ch # (Y axis) Responsible : Renju & Raman, NPD BARC TDC Channel numbers (0 to 127) 96 read outs from CMS RPC TDC ch # 32 to 127 Two strips not firing Few strips very noisy Master Trigger TDC ch # 31 16 o/p from scintillators in the hodoscope TDC ch # 0 15 Timing (ch #) L. M. Pant 27 India CMS Meeting, BARC, 03 Aug 12
Time profile of CMS RPC strips 28
Arrival of mechanics : Feb 2012 Engineering support from MDPDD VME DAQ and TDCs The road map : 2012 2014 RPC budget Signals from single GEM foil 29
QC for chamber assembly Production on three different sites : CERN, GHENT, BARC CERN site (904) will coordinate logistic & setting up protocols for QA / QC Common technical specification and protocols for production and QC discussed and agreed among the three sites Detailed DB for production and test in preparation CERN 904 BARC GHENT 10 RPCs per month 3 RPCs per month 5 RPCs per month 30
Delivery of gas gaps, other accessories Tentative delivery of accessories from CERN Aug end Tentative arrival of RE4/2 gas gaps from KODEL Sep end T o for chamber assembly and characterization starts Initially 3 RPCs per month 10 RPCs by Jan 2013 to CERN for SM assembly 31
RE4 Super Module preassembled 10 degree sector 32
RE4 Super Module (RE4/2 + RE4/3) : Prototype RE 4/3 RE 4/2 33
Arrival of mechanics : Feb 2012 Engineering support from MDPDD VME DAQ and TDCs The road map : 2012 2014 RPC budget Signals from single GEM foil L. M. Pant 34 India CMS Meeting, BARC, 03 Aug 12
HV and LV systems BARC and PU (160 kchf for each institute) Multichannel Power Supply (SY1527) Branch Controller (A1676A) HV AC to DC Convertor (A3485) LV MAO AC to DC Convertor (A3486) HV Module (A3512N) LV Module (A3009) EASY3000 Front Side EASY3000 Back Side 35
Installation and Commissioning : (2013 2014) India will contribute to 20 man months during installation and commissioning phase BARC will contribute PU will contribute : 5 man months for Installation : 5 man months for Commissioning : 5 man months for Installation : 5 man months for Commissioning 36
detector contribution from India for RE4 upgrade : 400 kchf 20 man months from India to be shared equally between BARC and PU 10 man months for Installation & 10 man months for Commissioning kchf 200 150 100 50 0 BARC + PU 150 33 33 115 50 19 detector 37
Thanks! 38
Arrival of mechanics : Feb 2012 Engineering support from MDPDD VME DAQ and TDCs The road map : 2012 2014 RPC budget Signals from single GEM foil L. M. Pant 39 India CMS Meeting, BARC, 03 Aug 12
1 2 3 Anode plane : 256 ch in 10 cm 6 GEM foil : 10 cm x 10 cm 5 GEM foil on a frame 4 Drift plane over the GEM foil Drift plane : 10 cm x 10 cm GEM foil over the anode plane 7 Sealing with capton foil 8 Single GEM ready for testing Single GEM assembled at NPD, with Anode plane, GEM foil and the Drift plane 40
Single GEM with voltage divider, gas flow in RPC Lab., NPD with P10 gas Ar + CO 2 online gas mixer installed on 14 July 2012 41
Responsible : Renju, NPD BARC 42
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pseudorapidity, = ln tan( /2) Is the polar angle of the particle wrt the beam axis 45
Trigger efficiency : existing end caps 46
simulated trigger efficiency plot : Piet Verwilligen 47
Phase I : Upgrades Currently running CMS detector : low luminosity detector To increase the physics potential at higher luminosities of 1 2x10 34 cm 2 s 1 Upgrades are proposed (CERN RRB 2011 077) M CHF 20 18 16 14 12 10 8 6 4 2 0 Magnet Tracker HCAL Muon M CHF CSC DT RPC 48