Large-Area GEM Detector
Development
at CMS, RD51, and Fl. Tech
– A brief overview –
Marcus Hohlmann
Florida Institute of Technology, Melbourne, FL
PHENIX tracking upgrade workshop - BNL, Dec 15, 2010
Overview
• Detector prototype development at CMS
• Production techniques for large-area GEM
detectors at Fl. Tech
• RD51 Scalable Readout System for MPGDs
Dec 15, 2010
M. Hohlmann – PHENIX tracking upgrade workshop
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Potential CMS high- upgrade
A. Sharma, S. Colafranceschi
Triple-GEM
Prototype
Potential muon upgrade
at ||>1.6 with GEMs
for triggering & tracking
Dec 15, 2010
M. Hohlmann – PHENIX tracking upgrade workshop
~1m
3
Large Triple-GEM prototype
Largest GEM detector
built to-date (CERN):
Shielding
Openings for
VFAT electronics
Readout
(PCB w/ strips)
Frame
GEM Foil
Drift plane
Al frame
with gas
distrib. grooves
Dec 15, 2010
HV divider
Spacers
3 mm Al base plate
M. Hohlmann – PHENIX tracking upgrade workshop
A. Sharma, S. Colafranceschi
4
Single-mask GEM foils
TOP
TOP
TOP
BOTTOM
BOTTOM
BOTTOM
Single-mask technology is
required for large-area
GEM foil production.
Recent quality of these foils
equals standard doublemask GEMs.
Single-mask GEM cross section
Examples of GEM hole quality
13 sectors
9 sectors
7 sectors
6 sectors
35 HV sectors per GEM foil
with area of ~100 cm2 each.
Single mask GEM foil with spacer frame at CERN
(active area: 990 mm long & 220-455 mm wide)
A. Sharma, S. Colafranceschi
Dec 15, 2010
M. Hohlmann – PHENIX tracking upgrade workshop
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Beam Test of Large-Area GEM
18-28 October 2010: Successful / Beam Test at RD51/H4 (CERN SPS)
12000.00
FRAME
Tracking telescope
Beam Direction – from left to right
direction
4600.00
4510.00
4650.00
980.00
2320.00
2520.00
4700.00
1860.00
Scintillator 3 G5 – Tracker
downstream
GEM
840.00
4440.00
2740.00
1140.00
4800.00
3880.00
G3 – Tracker
GEM
3280.00
2350.00
Scintillators 1 & 2
(Upstream)
G4 – Timing
GEM
2350.00
185.00
980.00
11000.00
920.00
G2 – Single
Mask Triple
GEM
4880.00
G1 –
Tracker
GEM
2050.00
Detector performed well.
Data analysis ongoing.
A. Sharma, S. Colafranceschi
Dec 15, 2010
M. Hohlmann – PHENIX tracking upgrade workshop
6
Fl. Tech GEM stretching technique
Cost-effective GEM foil thermal stretching
technique via infrared heating under clean
room conditions in our high-bay lab
(RD51 Technical Note in preparation)
Infrared lamps
Works
well !
along long side of frame
Dec 15, 2010
M. Hohlmann – PHENIX tracking upgrade workshop
7
Detectors with IR-stretched GEM foils
Eight detectors built at CERN using oven
(30cm  30cm active area)
Transfer of know-how from CERN
Two 30cm × 30cm detectors built at Fl. Tech
using IR stretching method:
Both
detectors
working
mips
Dec 30,
Sep
15, 2010
8 keV
X-rays
M. Hohlmann – PHENIX tracking upgrade workshop
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Readout Electronics & DAQ
RD51 coll. is developing a common Scalable Readout System for MPGD’s
• from few 100 to ~105 channels
• full hardware chain tested by now
Hans Müller
Sorin Martoiu
(CERN)
APV25 or
VFAT or
BNL ATLAS
Hybrid here .
Florida Tech SRS application:
• Commercial production of ~160 APV25 hybrids
• DAQ software development
• Event monitoring
• First demonstration of chain APV+SRS+DATE+AMORE
• First integration of SRS with 30cm×30cm GEM detectors
• Largest user of SRS to-date (~15k ch.)
Dec 15, 2010
Full readout of 3030cm2 detector w/ 1500 strips
X-Strip Cluster
Y-Strip Cluster
M. Hohlmann – PHENIX tracking upgrade workshop
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Available Facilities at Fl. Tech
• Production & Testing
–
–
–
–
–
Medium-size clean room for prod. (~ cl. 1,000)
Small clean room for R&D (~ class 10,000)
Laminar flow hood for R&D (~ class 100)
Space in 350 m2 high-bay area for test stands
Gas detector lab (HV, gas supply &
monitoring, 10 Gs LeCroy scope)
– Construction materials (e.g. glues, coatings)
High-Bay
experimental area
• Readout & DAQ
– Spare SRS r/o components in production for R&D work
– Dual SRS use (20,000 ch.) for existing 30cm×30cm GEMs and
for future R&D (PHENIX?) anticipated
– DAQ & monitoring software for SRS currently under development
Thank you for your time!
Dec 15, 2010
M. Hohlmann – PHENIX tracking upgrade workshop
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