Transcript TAMU TMB Mezz & Rad Test Update

Construction & Commissioning of
Full-size GEM prototypes for the
CMS High- Muon System
Marcus Hohlmann
(Florida Institute of Technology)
with C. Armaingaud, S. Colafranceschi, R. De Oliveira, and A. Sharma
(CERN)
on behalf of the
CMS GEM Collaboration
2012 IEEE Nuclear Science Symposium, Anaheim, CA N38-6
Nov 1, 2012
MOTIVATION & INTRODUCTION
11/1/2012
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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Premise for CMS GEM upgrade
• CMS was designed with a “hermetic and redundant muon system” –
Joe Incandela, CERN “Higgs Discovery” Event, 7/4/12
• But: CMS currently has the least redundancy in the most
challenging muon region, i.e. at |η| > 1.6:
RPCs descoped; only Cathode Strip Chambers currently present
• Long-term functioning of the muon system into LHC Phase II (beyond
Long LHC Shutdown 3) is of vital interest for CMS. Use Phase I to
evaluate muon technology for Phase II.
• The high-η muon region in particular will need robust and redundant
tracking and triggering at the anticipated higher muon rates
 Additional muon detectors with high spatial and temporal
resolution in the high-η endcap region could bring benefits
in triggering, reconstruction, and ID for muons: → GEMs
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M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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CMS GEM Endcap Chambers
The currently un-instrumented high- RPC region of the muon endcaps presents an
opportunity for instrumentation with a detector technology that could sustain the
radiation environment long-term and be suitable for operation at the LHC and its
future upgrades into Phase II: GEM Detectors
GE1/1 in YE1 nose
GE3/1
GE4/1
GE2/1
on back of YE1
CMS Detector
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M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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Method of Integration into CMS
Four superchambers in
their final position
Installation sequence:
Superchamber
(Two Triple-GEMs)
A. Conde Garcia
11/1/2012
Mounting on yoke disk
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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Expected Benefits for Reconstruction & Trigger
Expected gains in momentum resolution at high-pT
Staving off looming muon trigger inefficiencies at high-
Simulation
Expected CSC inefficiency
at PU=400 due to Cathode
LCT - Anode LCT timing
mismatching
for one GEM station
A. Safonov (Texas A&M)
Acceptance impact:  distribution of 4 muons in H → ZZ → 4µ
1.6<<2.4
M. Maggi (Bari) – GEM Workshop 3
Strip Readout granularity: # GEM strips / # RPC strips (orig. TDR)
11/1/2012
Paolo Giacomelli (Bologna) & Markus Klute (MIT) – GEM Workshop 3
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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CONSTRUCTION
OF FULL-SIZE GEM PROTOTYPES
11/1/2012
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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Evolution - GEM foil stretching
Current state-of-the-art: Self-stretching assembly without spacers (CERN)
Readout PCB
Tightening the
horizontal screws
tensions the GEMs
& seals gas volume
GEMs
Drift electrode
Detector base pcb
2012
only glue joint in assembly
Allows re-opening
of assembled
detector for repairs
if needed.
R. De Oliveira, CMS-GEM/RD51Workshops
CERN & U. Gent
11/1/2012
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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3rd CMS GE1/1 Prototype: “Self-Stretched - Sans Spacer”
No spacers in active volume
GEM foil with inner & outer frame
GEM foil in inner frame assembly
GEM tensioning
Vias for strips sealed
w/ kapton
compact HV divider
-sector with
384 radial
readout strips
(12.4 cm long)
Inside of readout board with O-ring seal
11/1/2012
HV noise
filters
Chamber closed by
readout board with
Panasonic connectors
for frontend electronics
2012
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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CMS Full-size GE1/1 Detector Prototype
 GEM active areas: 990 mm
 (220-445) mm
 Single-mask technology
 1D radial strip read-out with
3  8  128 = 3,072 channels
 HV sectors: 35
 3/1/2/1 mm gap sizes
 Gas mixtures:
Ar/CO2 (70:30; 90:10)
Ar/CO2/CF4 (45:15:40;
60:20:20)
 Gas flow: ≈ 5 l/h
The new self-stretching technique has been applied to the full-size CMS GEMs
Production of 5 prototypes launched in May 2012
11/1/2012
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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Prototype Production: Status & Plans
4 chambers completed at CERN
• 2 in SPS test beam in summer; 3rd being prepared for fall TB
• Some issue with dust particles from fiberglass frame getting
into active GEM area in first two prototypes
• micro sand blasting & polyurethane coating of frames
After sand blast
Frame after machining
After PU coating
→ change to different material (PEEK) for inner frame that holds GEMs
• 1st chamber to be assembled and commissioned outside CERN
this fall (at Florida Tech)
11/1/2012
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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Next Prototype: No Gluing & PEEK frames
Panasonic readout connector
Readout PCB
Outer frame
On-foil protection resistors
GEM foils
Use O-ring to seal
outer frames to drift plane
Inner frame
Drift Board
As a lot of dust was released during the screw insertions into
FR4 frames, CERN has replaced FR4 by PEEK for inner frames.
PEEK is one of the best polymers in terms of:
-radiation tolerance
-mechanical properties
-outgassing
-chemical resistance
Rui De Oliveira
11/1/2012
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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Summary of GEM production & Plans
We are now below 2 hours for the GE1/1 assembly
with the self-stretching technique
(after gluing outer frames to drift)
Rui De Oliveira
• Three 30cm  30cm detectors have been produced
• Up to now  ok
• Four 1.2m  0.45m detectors have been produced
• 2 tested OK  but gain uniformity still to be improved
• 2 others currently being tested
• Four new ones will be produced with all the improvements
to reach final specifications (< 30% gain non-uniformity)
• Preparing a new laboratory for CMS GEM assembly and
quality control at CERN (spring 2013)
11/1/2012
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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COMMISSIONING
OF FULL-SIZE GEM PROTOTYPES
11/1/2012
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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CMS GEM Summer Test Beam Effort at SPS
See Poster N14-137
11/1/2012
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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3rd GE1/1 Prototype: Commissioning Results
Fe55 spectrum
Preliminary 2012 test results
(bench tests & beam test at SPS H4)
250000
10000
200000
Gain uniformity
Rate plateau
sector1-4
1000
sector2-5
150000
sector1-5
sector3-5
100
sector2-7
sector1-7
10
2900
11/1/2012
100000
3100
3300
3500
3700
50000
0
2700
2900
3100
3300
3500
3700
3900
HV (V)
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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Long-term Aging Test at CERN GIF
CMS
prototype
Motivations
lead shield
 Ensure long-term operation in CMS
 Understand the effects of the radiation on the materials
 Understand aging origin (if any) and propose solutions
Gain of 2x104
50 MHz/cm2 X-rays,
10 days = > 20 C/cm2 integrated (LHCb)
GEM settings:
Drift: 3kV/cm, Others: 3,5 kV/cm Induction: 5 kV/cm
See Poster N14-138
Gain: 8 x 103 – 104
Gas Mix: Ar/CO2/CF4 (45:15:40)
The CMS full-size prototype has been installed in the CERN Gamma Irradiation Facility over the summer
The detector performance is being monitored along with environmental/gas variables
Armaingnaud/Merlin/Rohee/Furic/Buhours
Continuing R&D: Zigzag strips to reduce readout channel
count while maintaining high spatial resolution
Beam Test 2012
11/1/2012
2 mm
CAD Design by C. Pancake, Stony Brook
2 mm
Zigzag Resolution:
/2
= 73 µm
Preliminary
Results
With 2mm strip pitch
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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PLANS FOR INSTALLATION IN CMS
11/1/2012
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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GEM Installation in LHC Long Shutdown 1
CMS
P5 CAVERN UXC
Proposed to CMS Upgrade Management
GE2/1
ME2/1
Integration and Installation of 2 GE1/1
superchambers = 4 GE1/1 chambers
(and possibly 1 super-chamber GE2/1)
Participate in CRAFT 2014
YOKE
ME1/1
GE1/1
GE1/1
ME1/1
4 GEM chambers in LS1
•
•
•
•
•
Measure in situ:
•Rates, Background/Noise, Stability,
Uniformity, Efficiency
•Spatial resolution
– In the actual high-η environment
– In actual magnetic field
Split signal to CSC and participate in CMS muon trigger and reconstruction
Install new pre-production TMB prototypes on chambers that overlap with GEMs
Prove that the electronics design is working and demonstrate in situ that we can operate
CSC TMB with GEM input in various operating regimes
Reduce CSC X-Y ambiguity and ghosts
Once we go into beam operations, we will demonstrate the above again, this time
measuring muon trigger rates and efficiency with and without GEMs.
11/1/2012
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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GEM DAQ Prototype System for LS1
DAQ also with link to new
CSC Trigger Mother Board
Gigabit Link Interface Boards
11/1/2012
P. Aspell
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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Summary & Outlook
Long Shutdown 1 (LS1)
• 4 full-size GE1/1 detectors successfully constructed using simplified
self-stretch & sans spacer technique; being validated
• GEM electronics and DAQ prototype underway
• Installation, services, and integration with CSC’s underway
• Zero additional cost to CMS upgrade projects
• GEMs to participate in CRAFT 2014
Long Shutdown 2 (LS2)
• A GE1/1 station can be completed and installed in LS2
• Capacity in CERN Workshop to produce all (72 validated) detectors in
2 years; final electronics ready for 2015
• Cost 2-3 MCHF
11/1/2012
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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Thank you for your time!
We would like to explicitly acknowledge here the strong technical
support received from the RD51 Collaboration for this project!
11/1/2012
M. Hohlmann - Construction & Commissioning of Full-size GEM Prototypes for the CMS High-eta Muon System; IEEE NSS 2012, Anaheim, CA
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