roadmap for cms-rpc project
DESCRIPTION
Roadmap for CMS-RPC project. L. M. Pant Nuclear Physics Division Bhabha Atomic Research Centre, Mumbai. pseudorapidity , = - ln tan(/2) is the polar angle of the particle wrt the beam axis. 2008-2010. 2012-2013. The RPC fourth layer was de-scoped for lack of funds. - PowerPoint PPT PresentationTRANSCRIPT
Roadmap for CMS-RPC project
L. M. PantNuclear Physics Division
Bhabha Atomic Research Centre, Mumbai
L. M. Pant 1India CMS Meeting, BARC, 28 July 2011
pseudorapidity, = - ln tan(/2) is the polar angle of the particle wrt the beam axis
L. M. Pant 2India CMS Meeting, BARC, 28 July 2011
2008-2010 2012-2013
The RPC fourth layer was de-scoped for lack of funds
RPC Upscoped in 2008 for installation in 2010
In between priorities changed for CMS
RPC Upscope is revived and put alongwith other Upgrades
L. M. Pant 3India CMS Meeting, BARC, 28 July 2011
Expected financial contribution for low upgrade
18%
India
~ 800 kCHF~ 4 Crore
L. M. Pant 4India CMS Meeting, BARC, 28 July 2011
4 crore / 800 kCHF
Mumbai
Chandigarh
The Indian contribution : parked institute wise
2 Crore /400 kCHF
2 Crore /400 kCHF
L. M. Pant 5India CMS Meeting, BARC, 28 July 2011
4 crore / 800 kCHF
in kind (RPC)
in cash (HV, cables, gas)
How CMS-RPC management looks at 800 kCHF
2 Crore /400 kCHF
2 Crore /400 kCHF
L. M. Pant 6India CMS Meeting, BARC, 28 July 2011
RE4/2 sector : 2 end caps x 36 chambers + spares = 100 chambers
L. M. Pant 7India CMS Meeting, BARC, 28 July 2011
Integration of RE4/2 and RE4/3 RPCs : 10o chambers
RE4/2 (India)
RE4/3 (Belgium)
L. M. Pant 8India CMS Meeting, BARC, 28 July 2011
Belgium India CERN Italy China Korea Pakistan Egypt0
100
200
300
400
500
600
700
800
900
The groups involved with financial contributionsk
CHF
→
L. M. Pant 9India CMS Meeting, BARC, 28 July 2011
RPCs
MumbaiCERNGhent
as per the earlier TDR : Three RPC assembly sites
40 50
110
L. M. Pant 10India CMS Meeting, BARC, 28 July 2011
RPC assembly sites
Type of chamber
No. of chambers
Assembly sites
RE4/2 50 India
RE4/2 50 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 11India CMS Meeting, BARC, 28 July 2011
RPCs
IndiaCERNGhent
Proposed scenario
40
10060
L. M. Pant 12India CMS Meeting, BARC, 28 July 2011
Type of chamber
No. of chambers
Assembly sites
RE4/2 100 India
RE4/2 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
Proposed scenario
L. M. Pant 13India CMS Meeting, BARC, 28 July 2011
Routing of bakelite, gas-gaps, mechanics and finally RPCs to CERN
KOREA
CHINA INDIA
ITALY
CERN
BELGIUM
Bakelite route
Gas gap route
Mechanics route
RPC route
L. M. Pant 14India CMS Meeting, BARC, 28 July 2011
Modus Operandi at three sites
To begin with each site produces the first 10 chambers
In all, first 30, chambers should reach CERN by March 2012
Mechanics and gas gaps expected by end of August
FEBs/DB etc. would arrive by Nov 2011
Procedure continues for the remaining chambers : all to be delivered by 2012
Stricter QA/QCs for gas gap characterization and data base maintenance
L. M. Pant 15India CMS Meeting, BARC, 28 July 2011
Spacer test for the gas gaps
Time (sec) →
Ove
rpre
ssur
e (m
bar)
→39 peaks are recorded corresponding to each of the 39 spacers in the Top Wide gas gap (RE4/2-TW03)
Spacer region
Non-Spacer region
L. M. Pant 16India CMS Meeting, BARC, 28 July 2011
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 17India CMS Meeting, BARC, 28 July 2011
S1 ~ 3 Hz, Th ~ -120 mV
S2 ~ 5 Hz, Th ~ -180 mV
First prototype for RE4
L. M. Pant 18India CMS Meeting, BARC, 28 July 2011
A fully integrated CMS-bakelite RPC has
1. Three gas gaps2. Three Front End Boards3. Mechanics4. Cu read out panel5. Cu cooling system 6. Al supports, Screen box7. 96 Co-axial signal cables8. Mylars, gas pipes9. HV, LV cables
Rs. 3 Lakhs in 2008~ 6 kCHF
Cost of one RPC : RE4/2
There are other heads too
L. M. Pant 19India CMS Meeting, BARC, 28 July 2011
Shipment (25 lakhs / 50 kCHF)
Infrastructural investment at home (>>> 50 kCHF)(Test stand, Electronic Modules, gases, DAQ)
HV Cables/Power supplies/tests at CERN (~ 50 kCHF)
Manpower : Installation/Commissioning at CERN (4 persons x 4 months = 16 man months : ~ 50 kCHF)
Additional heads
L. M. Pant 20India CMS Meeting, BARC, 28 July 2011
Gas flow of 5 litres per hour being configuredSufficient gas available
Humidifier for the RPC gas mixture established
VME based DAQ/Software being developed for characterizing the RPCs : Renju
3 x 32 channel multihit TDCs available for 1 RPC
2 x 3 x 32 channel multihit TDCs needed for 2 more RPCs
Recent highlights of RPC lab at NPD-BARC
Hodoscope being configured. 5/16 scintillators assembled
L. M. Pant 21India CMS Meeting, BARC, 28 July 2011
twisted pair (40 pin / 20 pairs) flat cables for 100 chambers(A1, A2 B1, B2 C1, C2)
L. M. Pant 22India CMS Meeting, BARC, 28 July 2011
Cu cooling system : Type 4/2 for 100 chambersMDPDD : Manish
L. M. Pant 23India CMS Meeting, BARC, 28 July 2011
Cu cooling system : Type 4/3 for 100 chambersMDPDD : Manish
L. M. Pant 24India CMS Meeting, BARC, 28 July 2011
Cosmic stand at RPC Lab., in NPD-BARC
Simultaneously handle :
1. Three gas gaps with Argon for resistivity measurements
2. Three gas gaps on RPC gas mixture[R134a (96%) + Isobutane (3.5%) + SF6 (0.5%)]with 45% RH
3. Three RPCs for evaluation of :a. Efficiencyb. Strip profilec. Cluster size
4. Plastic scintillators (hodoscope) separated by 2m to get the cosmic trigger from muons
L : 2m, W : 1.6 m, H : 3 m
2m
L. M. Pant 25India CMS Meeting, BARC, 28 July 2011
Three RPCs per week : assembly and characterization
@ Three RPCs per week :
1. 10 RPCs in a month : March 2012
2. 40 RPCs in 4 months or : July 2012
3. 100 RPCs in 10 months : Dec 2012
4. Say approximately a year (end 2012)
5. Matches well with the time scale for delivery at CERN
2m
L. M. Pant 26India CMS Meeting, BARC, 28 July 2011
The old cosmic rack moves into an A/C area for storage of equipments as and when they arrive (corner of old beam hall)
L. M. Pant 27India CMS Meeting, BARC, 28 July 2011
Civil work completed
for housing 3 units of A/Cs withDehumidifiersfor round the clock operation for RPC Lab.
Equipment being procured by TSD : 25 Lakhs
Plastic scintillator
Width : 18 cmLength : 180 cmThickness : 1 cm
PMT read out fromboth the ends (OR)
Plastic scintillators for the hodoscope
L. M. Pant 28India CMS Meeting, BARC, 28 July 2011
Eight plastic scintillators on the lower bed
5/16 scintillators configuredhope to finish 16/16 by Aug end
8 x 18 = 144 cm
L. M. Pant 29India CMS Meeting, BARC, 28 July 2011
The Indian RPC collaboration
Panjab University, Chandigarh
NPD-BARC
10…40….60
61…
100
2 Faculties3-4 students,
2 tecnitians
MDPDD-BARC : 1 engineer2 technitians
Cu coolingMechanical aspectsFabricationTransportation
2 scientist1 assistant
L. M. Pant 30India CMS Meeting, BARC, 28 July 2011
Thank You !
Eagerly waiting for the first chamber to roll outby Jan 2012
L. M. Pant 31India CMS Meeting, BARC, 28 July 2011
Level 1 Trigger (L1)seeds High Level Trigger (HLT)
CMS Trigger system
for ensuring efficient muon reconstruction and identification
CSCs do the low level triggering
and tracking
receives data fromLHC bunch crossing
rate of 40 MHz
100 kHz at designed luminosity
Level 3 Trigger (L3)Info from Si-Tracker
100 Hz at designed luminosity
Level 2 Trigger (L2)track info. from muon detectors
(DTs, CSCs and RPCs)
L. M. Pant 32India CMS Meeting, BARC, 28 July 2011
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 33India CMS Meeting, BARC, 28 July 2011