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COMPASS PixelGEM Production
A. Austregesilo, •F. Haas, B. Ketzer, I. Konorov, M. Kramer,A. Mann, T. Nagel, S. Paul, F. Schneider, S. Uhl
TU Munchen, Physik Department E18
Workshop on GEMs and Micromegas, February 16th 2009
Supported by
Maier-Leibnitz-Labor
Garching bei Munchen
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Overview
1 The COMPASS Experiment
2 The PixelGEM Detector
3 GEM Assembly
4 Detector Performance
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
The COMPASS Experiment
Overview
COmmon Muon and Proton Apparatusfor Structure and Spectroscopy 1
located at the CERN SPS
two stage magnetic spectrometer→ large angular acceptance
data taking since 2002→ up to 580 TByte/year
Beam Rates
(tertiary) Muon:
→ 4·107s−1
(secondary) Hadron (π, K, ...):
→ 5·106s−1
Tracking
Silicons (σx∼10µm),SciFis (σt∼0.4ns)
GEMs (σx∼70µm),MicroMegas (σx∼90µm)
Drift Chambers (σx ≤ 200µm)
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
The COMPASS Experiment
Overview
COmmon Muon and Proton Apparatusfor Structure and Spectroscopy 1
located at the CERN SPS
two stage magnetic spectrometer→ large angular acceptance
data taking since 2002→ up to 580 TByte/year
Beam Rates
(tertiary) Muon:
→ 4·107s−1
(secondary) Hadron (π, K, ...):
→ 5·106s−1
Tracking
Silicons (σx∼10µm),SciFis (σt∼0.4ns)
GEMs (σx∼70µm),MicroMegas (σx∼90µm)
Drift Chambers (σx ≤ 200µm)
1[Nucl. Instr. and Meth. A 577 (2007) 455]
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
The COMPASS Experiment
Overview
COmmon Muon and Proton Apparatusfor Structure and Spectroscopy 1
located at the CERN SPS
two stage magnetic spectrometer→ large angular acceptance
data taking since 2002→ up to 580 TByte/year
Beam Rates
(tertiary) Muon:
→ 4·107s−1
(secondary) Hadron (π, K, ...):
→ 5·106s−1
Tracking
Silicons (σx∼10µm),SciFis (σt∼0.4ns)
GEMs (σx∼70µm),MicroMegas (σx∼90µm)
Drift Chambers (σx ≤ 200µm)
1[Nucl. Instr. and Meth. A 577 (2007) 455]
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
The COMPASS Experiment
Overview
COmmon Muon and Proton Apparatusfor Structure and Spectroscopy 1
located at the CERN SPS
two stage magnetic spectrometer→ large angular acceptance
data taking since 2002→ up to 580 TByte/year
Beam Rates
(tertiary) Muon:
→ 4·107s−1
(secondary) Hadron (π, K, ...):
→ 5·106s−1
Tracking
Silicons (σx∼10µm),SciFis (σt∼0.4ns)
GEMs (σx∼70µm),MicroMegas (σx∼90µm)
Drift Chambers (σx ≤ 200µm)
1[Nucl. Instr. and Meth. A 577 (2007) 455]
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
GEMs for Beam Tracking
Triple-GEM Detectors:
high rate capability 1,2
COMPASS requirements:
beam rates: . 105 mm−2 s−1
small material budget3
center: x/X0 =0.4 %
Strip Readout
strip occupancy too high
no sufficient beam tracking withstrip readout
GEM detector with combined pixel/strip readout
1[S. Bachmann, A. Bressan, B. Ketzer et al., Nucl. Instr. and Meth. A 470 (2001) 548.]
2[S. Bachmann, S. Kappler, B. Ketzer et al., Nucl. Instr. and Meth. A 478(2002) 104.]
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
GEMs for Beam Tracking
Triple-GEM Detectors:
high rate capability 1,2
COMPASS requirements:
beam rates: . 105 mm−2 s−1
small material budget3
center: x/X0 =0.4 %
Strip Readout
strip occupancy too high
no sufficient beam tracking withstrip readout
GEM detector with combined pixel/strip readout
3[C. Altunbas et al., Nucl. Instr. and Meth. A 490 (2002) 177]
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
GEMs for Beam Tracking
Triple-GEM Detectors:
high rate capability 1,2
COMPASS requirements:
beam rates: . 105 mm−2 s−1
small material budget3
center: x/X0 =0.4 %
Strip Readout
strip occupancy too high
no sufficient beam tracking withstrip readout
GEM detector with combined pixel/strip readout
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
GEMs for Beam Tracking
Triple-GEM Detectors:
high rate capability 1,2
COMPASS requirements:
beam rates: . 105 mm−2 s−1
small material budget3
center: x/X0 =0.4 %
Strip Readout
strip occupancy too high
no sufficient beam tracking withstrip readout
GEM detector with combined pixel/strip readout
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
The combined Pixel-Strip-Readout
3-layer foil(base material: Kapton)
thickness: 100 µm
32 x 32 pixels
pitch: 1 mm
1024 strip channels(512 x, 512 y)
pitch: 400 µm
equal charge sharing
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
The combined Pixel-Strip-Readout
3-layer foil(base material: Kapton)
thickness: 100 µm
32 x 32 pixels
pitch: 1 mm
1024 strip channels(512 x, 512 y)
pitch: 400 µm
equal charge sharing
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
The combined Pixel-Strip-Readout
3-layer foil(base material: Kapton)
thickness: 100 µm
32 x 32 pixels
pitch: 1 mm
1024 strip channels(512 x, 512 y)
pitch: 400 µm
equal charge sharing
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
The combined Pixel-Strip-Readout
3-layer foil(base material: Kapton)
thickness: 100 µm
32 x 32 pixels
pitch: 1 mm
1024 strip channels(512 x, 512 y)
pitch: 400 µm
equal charge sharing
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
The combined Pixel-Strip-Readout
3-layer foil(base material: Kapton)
thickness: 100 µm
32 x 32 pixels
pitch: 1 mm
1024 strip channels(512 x, 512 y)
pitch: 400 µm
equal charge sharing
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
The combined Pixel-Strip-Readout
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
The combined Pixel-Strip-Readout
Dimensions
pixel area: 32 x 32 mm2
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
The combined Pixel-Strip-Readout
Dimensions
pixel area: 32 x 32 mm2
active area: 100 x 100 mm2
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
GEM Geometries and Settings
GEM Parameters
double-conical etched holes
140 µm pitch
70 µm outer hole diameter
GEM Characteristics
segmented foils
triple amplification
asymmetric gain sharing
Foil Properties
foil size: 330 x 330 mm2
no gas amplification in outerregion
big holes (∅ 0.5 mm) onlyfor gas exchange
thin copper
foils with only 1-2 µm thick copper1
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
GEM Geometries and Settings
GEM Parameters
double-conical etched holes
140 µm pitch
70 µm outer hole diameter
GEM Characteristics
segmented foils
triple amplification
asymmetric gain sharing
Foil Properties
foil size: 330 x 330 mm2
no gas amplification in outerregion
big holes (∅ 0.5 mm) onlyfor gas exchange
thin copper
foils with only 1-2 µm thick copper1
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
GEM Geometries and Settings
GEM Parameters
double-conical etched holes
140 µm pitch
70 µm outer hole diameter
GEM Characteristics
segmented foils
triple amplification
asymmetric gain sharing
Foil Properties
foil size: 330 x 330 mm2
no gas amplification in outerregion
big holes (∅ 0.5 mm) onlyfor gas exchange
thin copper
foils with only 1-2 µm thick copper1
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
GEM Geometries and Settings
GEM Parameters
double-conical etched holes
140 µm pitch
70 µm outer hole diameter
GEM Characteristics
segmented foils
triple amplification
asymmetric gain sharing
Foil Properties
foil size: 330 x 330 mm2
no gas amplification in outerregion
big holes (∅ 0.5 mm) onlyfor gas exchange
thin copper
foils with only 1-2 µm thick copper1
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
GEM Geometries and Settings
GEM Parameters
double-conical etched holes
140 µm pitch
70 µm outer hole diameter
GEM Characteristics
segmented foils
triple amplification
asymmetric gain sharing
Foil Properties
foil size: 330 x 330 mm2
no gas amplification in outerregion
big holes (∅ 0.5 mm) onlyfor gas exchange
thin copper
foils with only 1-2 µm thick copper1
1[A. Bondar, et al., Nucl. Instr. and Meth. A 556 (2006) 495]
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Assembly
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
All constructional drawingsdone at TU Munich(with advice of CERNengineers)
The same for the layout ofthe foils (Gerber files)
Foils and support structuresmanufactured at CERN
Testing, assembly andcommissioning done at TUMunich
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Infrastructure
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Preparation
Sanding of all support frames to remove grouts (danger ofshortcuts in the detector)
Cleaning of components with Isopropanol and demineralizedwater in ultrasonic bath
Storage of foils in nitrogen atmosphere to avoid oxidation
After preparation touch components only with gloves(fingerprint on foils can cause 1 mA leakage current!)
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Qualitity Assurance I - Optical Inspection
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Qualitity Assurance I - Optical Inspection
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Qualitity Assurance I - Optical Inspection
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Qualitity Assurance I - Optical Inspection
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Qualitity Assurance I - HV Tests
HV tests for Driftplates,Spacergrids and Driftfoilsdone by ambient atmosphere
HV tests for GEM foilsunder nitrogen atmosphere(no oxygen or water allowed)
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Qualitity Assurance I - HV Tests
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Gluing
Stretching frame for fixation and flattening of GEM foils duringgluing process
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Gluing
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Gluing
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Gluing
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Gluing
monitoring of environmentalconditions during eachproduction step
complete polymerization ofglue important→ constant, definedtemperature for severalhours
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Gluing
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Qualitity Assurance II
After each production stepthe components have to betested for their stability andfunctionality
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Assembly
Complete assembly in two steps
Step1: Gluing the GEMstack, consisting of 3 GEMfoils - Spacergrid pairs andDriftfoil glued on Driftplate
Quality control
Step 2: Gluing tested GEMstack on Readout
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Documentation
Each production step, fromthe preparation to the lastcommissioning must bedocumented
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Documentation
Each production step, fromthe preparation to the lastcommissioning must bedocumented
Webbased MySQL databaseincluding
PhotosQuality testsProduction logsEnvironmental data
for each production step
For each detector completesummary available (PDF oronline)
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Complete Detector
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
For detailed procedure steps and further commissioning seeproduction guide1 at
www.e18.physik.tu-muenchen.de
1Construction and Test of PixelGEM Tracking DetectorsFlorian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Detector Performance
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Gain
Detector Voltage [V]
3650 3700 3750 3800 3850 3900 3950 4000 4050 4100 4150
Gas
Gai
n 410
Center Voltage [V], rest fixed to 3.9kV960 980 1000 1020 1040 1060
X-Ray Pixel Measurement: Center(rot), Total(blue)
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Beam Intensities
Estimations of particle flux in the pixel region
[mm]0 5 10 15 20 25 30
[mm
]
0
5
10
15
20
25
30
0
20
40
60
80
100
120
310×
Myon beam
4.8·107/s
≤ 1.2·105/s/mm2
mm0 5 10 15 20 25 30
mm
0
5
10
15
20
25
30
200
400
600
800
1000
GP03P2 Hit pixels
Pion beam
5·106/s
≤ 1.6·104/s/mm2
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Spatial Resolution
Low Intensity: ≤ 2·103/s/mm2
[mm]-2 -1.5 -1 -0.5 0 0.5 1 1.5 20
2000
4000
6000
8000
10000
12000
σ = 90µm
High Intensity: ≤ 1·105/s/mm2
[mm]-2 -1.5 -1 -0.5 0 0.5 1 1.5 20
2000
4000
6000
8000
10000
σ = 135µm
with/without Clustering, green: Gauss fit components
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Time Resolution
Low Intensity: ≤ 2·103/s/mm2
SignalA 0.2± 4000
0,Signalt 0.0163± 0.3386 Signalσ 0.017± 6.918
BackgroundA 5.3± 446.3
0,Backgroundt 0.079± -4.362 Backgroundσ 0.08± 19.14
Time Residual [ns]-100 -80 -60 -40 -20 0 20 40 60 80 1000
1000
2000
3000
4000
5000 SignalA 0.2± 4000
0,Signalt 0.0163± 0.3386 Signalσ 0.017± 6.918
BackgroundA 5.3± 446.3
0,Backgroundt 0.079± -4.362 Backgroundσ 0.08± 19.14
σt ≤ 7ns
High Intensity: ≤ 1·105/s/mm2
SignalA 57.8± 5252
0,Signalt 0.035± 2.548
Signalσ 0.073± 7.718
BackgroundA 59.2± 9015
0,Backgroundt 0.117± -4.382
Backgroundσ 0.22± 27.47
Time Residual [ns]-100 -80 -60 -40 -20 0 20 40 60 80 1000
2000
4000
6000
8000
10000
12000
14000
SignalA 57.8± 5252
0,Signalt 0.035± 2.548
Signalσ 0.073± 7.718
BackgroundA 59.2± 9015
0,Backgroundt 0.117± -4.382
Backgroundσ 0.22± 27.47
σt ≤ 8ns
blau: Signal, magenta: Underground
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Detector Efficiency
Low Intensity: ≤ 2·103/s/mm2
[mm]0 5 10 15 20 25 30
[mm
]
0
5
10
15
20
25
30
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Mean Efficiency ≈ 99.3 %
High Intensity: ≤ 1·105/s/mm2
[mm]0 5 10 15 20 25 30
[mm
]
0
5
10
15
20
25
30
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Mean Efficiency ≈ 95.5 %
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Readout Chain
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Spatial/Time Resolution COMPASS Triple GEM Detectors
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Efficencies COMPASS Triple GEM Detectors
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Efficiency Plateau
Low Intensity: ≤ 2·103/s/mm2
Detector Voltage [V]
3700 3750 3800 3850 3900 3950 4000
εE
ffic
ien
cy
0.8
0.82
0.84
0.86
0.88
0.9
0.92
0.94
0.96
0.98
1 b0
0.002
0.004
0.006
0.008
0.01
0.012
0.014
0.016
0.018
0.02
Efficiency Plateau: 98.5 %
Background per pixel: ≤ 0.1 %
High Intensity: ≤ 1·105/s/mm2
Detector Voltage [V]
3800 3850 3900 3950 4000
εE
ffic
ien
cy
0.8
0.82
0.84
0.86
0.88
0.9
0.92
0.94
0.96
0.98
1 b
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
0.18
0.2
Efficiency Plateau: 95.5 %
Background per pixel: ≈ 2 %
Background: probability to find uncorrelated clusters within a certain roadwidth around a track
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
FrontEnd-Electronics
APV25 S1 ASIC1
128 channels per APV
160 samples pipeline
40 MHz sampling frequency
average noise:∼ 1300 - 1500 electrons
used for Silicon, GEM and RICHat COMPASS
1M.J. French, et al. Nucl. Instr. and Meth. A 466 (2001) 359
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Front-End Electronics
Readout Scheme
16 front-end cards perdetector
bus-cards to 12 bit ADC
3 Sample Amplitude Information
⇒ clustering⇒ time reconstruction
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Front-End Electronics
Readout Scheme
16 front-end cards perdetector
bus-cards to 12 bit ADC
3 Sample Amplitude Information
⇒ clustering⇒ time reconstruction
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Front-End Electronics
Readout Scheme
16 front-end cards perdetector
bus-cards to 12 bit ADC
3 Sample Amplitude Information
⇒ clustering⇒ time reconstruction
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
crosstalk suppression
beamspot with crosstalk
[mm]0 5 10 15 20 25 30
[mm
]
0
5
10
15
20
25
30
500
1000
1500
2000
2500
3000
crosstalk suppressed
[mm]0 5 10 15 20 25 30
[mm
]
0
5
10
15
20
25
30
500
1000
1500
2000
2500
tag channels with high-amplitude neighbours
after clustering: remove clusters containing mostly taggedpixels
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Material Budget
Centre Periphery[X0/1000] [X0/1000]
Support 0.0 2.9Driftfoil 0.5 0.53 GEM-Foils 2.1 2.1Readout Foil 1.0 1.3Shielding 0.2 0.2Gas 0.1 0.1
Sum 3.9 7.1
Centre: r < 15 mm, Periphery: r > 15 mm
Cu layer 5 µm
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Material Budget
Centre Periphery[X0/1000] [X0/1000]
Support 0.0 2.9Driftfoil 0.5 / 0.3 0.5 / 0.33 GEM-Foils 2.1 / 0.8 2.1 / 0.8Readout Foil 1.0 1.3Shielding 0.2 0.2Gas 0.1 0.1
Sum 3.9 / 2.4 7.1 / 5.6
Centre: r < 15 mm, Periphery: r > 15 mm
Cu layer 5 µm / 1 µm
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
Modifications Prototype - Prototype II
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
The PixelGEM Project
Project Overview
2006 Development and first prototype (5 µm)in the COMPASS spectrometer
2007 Improvements in design and electronics,second prototype (1-2 µm)in the spectrometer
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
The PixelGEM Project
Project Overview
2006 Development and first prototype (5 µm)in the COMPASS spectrometer
2007 Improvements in design and electronics,second prototype (1-2 µm)in the spectrometer
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
The COMPASS ExperimentThe PixelGEM Detector
GEM AssemblyDetector Performance
The PixelGEM Project
Project Overview
2006 Development and first prototype (5 µm)in the COMPASS spectrometer
2007 Improvements in design and electronics,second prototype (1-2 µm)in the spectrometer
2008 Five PixelGEMs installed
Florian Haas - TU Munchen Physik Department E18 COMPASS PixelGEM Production
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