gems for cms upgrade
DESCRIPTION
GEMs for CMS Upgrade. Muons are quite central to most of the Physics that would unfold from “C M S” Triggering and tracking with muons , is therefore a challenging task : Detector R&D (Hardware techniques) Instrumentation and Trigger generation (Software development) - PowerPoint PPT PresentationTRANSCRIPT
GEMs for CMS Upgrade• Muons are quite central to most of the Physics that would unfold from “CMS”
• Triggering and tracking with muons, is therefore a challenging task :
Detector R&D (Hardware techniques)Instrumentation and Trigger generation (Software development)
• Muon detectors are in the peripheral regions of the calorimeter, they tend :
to be large sized in areas ( 1 to 2 m2)to have a larger granularity in the forward regionwith excellent timing capabilities
wide acceptance and robust triggeringL. M. Pant 1India CMS Meeting, BARC, 28 July 2011
• Standard Model precision measurement :
• high-η : Z production for backward-forward asymmetry studies (important for pdf)
• precise measurements of electroweak processes where barrel is not enough (low-pT : J/ψ, Υ)
• Exotica (new physics at 7-8 TeV mass scale) :
• Heavy-resonances (with possible multi-leptons signatures)
• New heavy HSCP which may need precision timing
Physics for high eta region
L. M. Pant 2India CMS Meeting, BARC, 28 July 2011
Reduced RE system|η| < 1.6
η=2.4
η =2.4
Scenario with a double GE1/1 and a single GE2/1 station
in each endcap
Initial RPC end-cap system
L. M. Pant 3India CMS Meeting, BARC, 28 July 2011
The Forward Muon RPC trigger system is equipped with detectors at η < 1.6, the high η region of CMS is presently vacant and presents an opportunity to instrument it with a detector technology that could sustain the environment and be suitable for operation at the LHC and its future upgrades.
CMS GE1/1 ??
L. M. Pant 4India CMS Meeting, BARC, 28 July 2011
Forward Muon RPC Trigger system
RPC Region Rates Hz/cm2
LHC (1034 cm2/s)
High Luminosity LHC
(2.3 x LHC)
(1035cm2/s) Phase II SLHC ??
RB 30 Few 100 kHz (tbc)
RE 1, 2, 3,4 h < 1.6 30 Few 100 kHz (tbc)
Total Expected Charge in 10 years
0.05 C/cm2 0.15 C/cm2 C/cm2
RE 1,2,3,4 h > 1.6 500 Hz kHz few kHz few 10’s kHz
Total Expected Charge in 10 years
(0.05 - 1) C/cm2 few C/cm2 few 10’s C/cm2
The harsh environment
L. M. Pant 5India CMS Meeting, BARC, 28 July 2011
h = 1.6
h = 2.1
GE 1/1Double station20o chambers
2 x 18 = 36
GE 1/1Double station20o chambers
2 x 18 = 3672 + 8 spares = 80 GE 2/1
Single station10o chambers
1 x 36 = 36
GE 2/1Single station10o chambers
1 x 36 = 3672 + 8 spares = 80
Total 160 chambers @ 7 kCHF
3 GEM layers on either side
L. M. Pant 6India CMS Meeting, BARC, 28 July 2011
Cost of GEM based upgrade160 GEMs in 3 layers ()
1 kCHF Rs. 50,000/-
SN Item Cost (kCHF)
1 Detector : 160 @ 7 kCHF 1120
2 Electronics 2200
3 Power Supplies & Cables 480
4 Mechanics and Services 600
5 Gas mixing and distribution systems 75
6 Total 4475
7 Contingency (15%) 671.25
8 Grand Total 5146.25
9 Rounded 5000
Total Cost : 5 MCHF Rs. 25 CroreThis is in additional to 65 MCHF total given in the upgrade technical proposal
L. M. Pant 7India CMS Meeting, BARC, 28 July 2011
• The GEM collaboration currently comprises– 76 collaborators– 14 institutions
Bari (INFN & Univ.), Beijing, CERN, Delhi, Florida Tech, Frascati, Gent, Islamabad (NCP), Kolkata, Mumbai (BARC & TIFR), Napoli, INFN Pisa/Siena, Warsaw, and Wayne State
– 7 countries (plus CERN)Belgium, China, India, Italy, Pakistan, Poland, USA + CERN
• Additional groups are interested in joining:– ULB Brussels, Belgium (Gilles De Lentdecker)– Tsinghua U., China (Chunhua Jian)– Panjab University, India (Jasbir B. Singh)– KODEL, Seoul, Korea (Sung Park)
The GEM collaboration
L. M. Pant 8India CMS Meeting, BARC, 28 July 2011
In the present project stage resources are needed/used for :
construction of small and large prototypes (mechanics, electronics, HV dividers, detector mockup ...)
lab equipment and consumables
instrumentation and running during test beam campaigns
L. M. Pant 9India CMS Meeting, BARC, 28 July 2011
Present need for resources
Base material : Polyimide 50 µm + 5 µm Cu on both sides
•Base material
•Hole patterning in Cu
•Polyimide etch
•Bottom electro etch
•Second Polyimide Etch
•Double mask •Single mask
L. M. Pant 10India CMS Meeting, BARC, 28 July 2011
GEM double mask vs. single mask
• limited to 40 cm x 40 cm• mask precision
• limited to 2 m x 60 cm
Present GEM foil : 1.2 m x 0.6 m
Future GEM foils : 2m x 0.6 mL. M. Pant 11India CMS Meeting, BARC, 28 July 2011
Proposed Indian contribution
h = 1.6
h = 2.1
GE 2/1, Single station, 10o chambers, 1 x 36 = 36
Cost : 1125 kCHF (22% of the projected cost)
: Rs. 6 Crore
Institutes : NPD-BARC, PU-Chandigarh, SINP, ?, ?
Cost / Institute : Rs. 2 Crore [12th plan (2012-2017); 13th plan]
Other Indian : cost per institute reduces orInstitutes : one could take up extra layersJoining
L. M. Pant 12India CMS Meeting, BARC, 28 July 2011
NPD-BARC and GEMs : 1 of 41. NPD-BARC has expressed its interest (EoI) :
Sep 2010 workshop on MPGDs at CERN
2. The necessary infrastructure exists at NPD-BARC for handling the project
3. BARC, as a whole, is planning to join the RD51 collaboration (procedures in the pipeline)
4. A triple GEM (10 cm x 10 cm) procured from CERN is being configured in RPC Lab., at NPD-BARC
5. Gas mixing system arranged for the GEM (Ar:CO2 :: 70:30)
6. Reactive Ion Etching of polymide surface being studied with RF plasma in a local industry
7. Clean volume for GEM operation being augmented
8. Linkages to the existing programmes : RPCs for CMS L. M. Pant 13India CMS Meeting, BARC, 28 July 2011
200 X magnification of a GEM foil • Rejected Gem foil
• Cu etched on one side • Polyamide film visible within the circles
• Hole diameter 70 µm • Pitch 140 µm • Equilateral triangle symmetry
• The surface quality of GEM does not appear to be good
Cu
140
µm
70 µm
NPD-BARC and GEMs : 2 of 4
L. M. Pant 14India CMS Meeting, BARC, 28 July 2011
RIE machine for dry etching of polymide surface between the etched copper in a local industry
Preparations for dry etching of GEM foilsNPD-BARC and GEMs : 3 of 4
L. M. Pant 15India CMS Meeting, BARC, 28 July 2011
• GEMs active area: 10 x 10 cm2
• Double mask triple GEM • 1D readout (128 ch on X)• Strip pitch = 0.8mm• Gas mixture : Ar/CO2 (70/30)• Gas flow : 5 litres per hour• Test with an X-ray source
To do : Triple GEM to be configured for tests
Drift
GEM3T
Anode
3.00 mm
GEM3B
GEM2TGEM2B
GEM1TGEM1B
1.00 mm
1.00 mm
Drift gap
T1
T2
Induction gap 1.00 mm
NPD-BARC and GEMs : 4 of 4
L. M. Pant 16India CMS Meeting, BARC, 28 July 2011
Manpower
Scientist : 2 Assistant : 1
Need student : 1
GEM foil with the protection resistors
Read-Out board, bottom plane
Read-Out board, top plane, connector
Frame for stretching
Placing the foil Mounting the frame and stretching
Stretched GEM foil Placing the Read-Out
Assembly procedures : 2-3 hours
L. M. Pant 17India CMS Meeting, BARC, 28 July 2011
GEMs for CMS
Saha Institute of Nuclear Physics
L. M. Pant 18India CMS Meeting, BARC, 28 July 2011
Fields of Interest
Simulation
Characteristic responses: gain and signal in magnetic field
Dynamics related issues: transparency, efficiency, ion back-flow, efficiency, charging up, gas flow
Effect of design parameters: spacer, drift electrode
Gas composition
Experiment
Optimization of design parameters:
spacer and drift electrode
Measurement of detector dynamics:gain, ion back-flow, gas flow
In-Beam Tests
Data AnalysisL. M. Pant 19India CMS Meeting, BARC, 28 July 2011
ResourcesExpertise
Experiment: experience of working in both low energy and high energy nuclear physics experiments at various national and international accelerator facilities, operation and testing of detectors (gaseous, solid state, scintillator), fluid dynamics, data analysis
Programming and simulation: development of electrostatic field solver (neBEM), interface of neBEM with GARFIELD (RD51 collaboration WG4), detailed field and response simulation of MPGDs, fluid dynamics
Personnel (current status)
Faculty: 3 Student: 1 Technician: 2
Infrastructure:
MPGD laboratory with necessary gas flow unit and electronics, XYZ precision positioning system
Blade servers, high-end work stationsL. M. Pant 20India CMS Meeting, BARC, 28 July 2011