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
Dec 15, 2010 M. Hohlmann – PHENIX tracking upgrade workshop 2
• Detector prototype development at CMS
• Production techniques for large-area GEM detectors at Fl. Tech
• RD51 Scalable Readout System for MPGDs
Potential CMS high- upgrade
Potential muon upgrade
at ||>1.6 with GEMs
for triggering & trackingDec 15, 2010 M. Hohlmann – PHENIX tracking upgrade workshop 3
A. Sharma, S. Colafranceschi
~1m
Triple-GEM
Prototype
Large Triple-GEM prototype
Dec 15, 2010 M. Hohlmann – PHENIX tracking upgrade workshop 4
Shielding
Readout(PCB w/ strips)
Frame
GEM Foil
HV divider
Drift plane
Al frame with gas distrib. grooves
Openings for VFAT electronics
Spacers
3 mm Al base plateA. Sharma, S. Colafranceschi
Largest GEM detector
built to-date (CERN):
Single-mask GEM foils
Dec 15, 2010 M. Hohlmann – PHENIX tracking upgrade workshop 5
6 sectors7 sectors
9 sectors13 sectors
35 HV sectors per GEM foil with area of ~100 cm2 each.
Single-mask GEM cross section
Single mask GEM foil with spacer frame at CERN(active area: 990 mm long & 22-45.5 mm wide)
TOP
TOP
TOP BOTTOM
BOTTOM
BOTTOM
Single-mask technology is required for large-area GEM foil production.
Recent quality of these foils equals standard double-
mask GEMs.
Examples of GEM hole quality
A. Sharma, S. Colafranceschi
Beam Test of Large-Area GEM
Dec 15, 2010 M. Hohlmann – PHENIX tracking upgrade workshop 6
12000.00
980.
00
2350
.00
3280
.00
2350
.00
3880
.00
2320
.0011
000.
00
980.
00
920.002050.00
1140.002740.00 1860.00 2520.00
840.00
4440
.00
4700
.00
4880
.00
4600
.00
4510
.00
185.00
4650
.00
4800
.00
FRAME
Scintillators 1 & 2(Upstream)
G1 – Tracker
GEM
G2 – Single Mask Triple
GEM G3 – Tracker GEM
G4 – Timing GEM
G5 – Tracker GEM
Scintillator 3 - downstream
Beam Direction – from left to right direction
18-28 October 2010: Successful / Beam Test at RD51/H4 (CERN SPS)
Tracking telescope
A. Sharma, S. Colafranceschi
Detector performed well.
Data analysis ongoing.
Fl. Tech GEM stretching technique
Dec 15, 2010 M. Hohlmann – PHENIX tracking upgrade workshop 7
Cost-effective GEM foil thermal stretching technique via infrared heating under clean room conditions in our high-bay lab
(RD51 Technical Note in preparation)
along long side of frame
Works
well !
Infrared lamps
Detectors with IR-stretched GEM foils
Dec 15, 2010 M. Hohlmann – PHENIX tracking upgrade workshop 8Sep 30, 2010 8
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
mips8 keV
X-rays
Readout Electronics & DAQ
Dec 15, 2010 M. Hohlmann – PHENIX tracking upgrade workshop 9
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.)
RD51 coll. is developing a common Scalable Readout System for MPGD’s
9
APV25 or
VFAT or
BNL ATLAS
Hybrid here .
Hans Müller
Sorin Martoiu
(CERN)
• from few 100 to ~105 channels
• full hardware chain tested by now
X-Strip Cluster
Y-Strip Cluster
Full readout of 3030cm2 detector w/ 1500 strips
Available Facilities at Fl. Tech
Dec 15, 2010 M. Hohlmann – PHENIX tracking upgrade workshop 10
•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)
•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
High-Bay
experimental area
Thank you for your time!
