cbm-rich: photodetector developement
DESCRIPTION
Piotr Koczo ń,GSI. CBM Workshop February 2008. CBM-RICH: Photodetector developement. CBM Collaboration Meeting February 2008. P.Koczo ń, C.Höhne, A.Braem C.Joram, S.Ilie, M. van Stenis. Piotr Koczo ń,GSI. CBM Workshop February 2008. Piotr Koczo ń,GSI. CBM Workshop February 2008. - PowerPoint PPT PresentationTRANSCRIPT
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CBM-RICH: Photodetector developement
CBM Collaboration Meeting February 2008
P.Koczoń, C.Höhne, A.BraemC.Joram, S.Ilie, M. van Stenis
CBM Workshop February 2008 Piotr Koczoń,GSI
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CBM Workshop February 2008 Piotr Koczoń,GSI
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CBM Workshop February 2008 Piotr Koczoń,GSI
Photodetector for RICH CsI – MPWC, PM Array photomultiplier: H8500, H9500
geometrical properties -> coverageoptical properties -> quantum efficiency
electronical properties -> readout, cross-talk
H8500: room for improvements:- WLS coating: technology, measurements, results- Single Photon Counting: measurement, results
Outlook/Plans
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CBM Workshop February 2008 Piotr Koczoń,GSI
H8500
8x8 pads5.8 x 5.8 mm each89% packing densityU=1100 V butborosilicate windowand low QE for UV
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CBM Workshop February 2008 Piotr Koczoń,GSI
Wave-length shifter
p-TerphenylpTer
TetraphenylButadiene TPB
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CBM Workshop February 2008 Piotr Koczoń,GSI
Coating plant (theory)
Schutter
Boat
PMs
Heating
Vacuum
Quartz crystal microbalance
Material
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CBM Workshop February 2008 Piotr Koczoń,GSI
Coating plant (reality)
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CBM Workshop February 2008 Piotr Koczoń,GSI
Depositing pTer, TPB and YellowX
TPB pTer YellowXPM5 41 μg/cm2 63 μg/cm2
PM4 65 μg/cm2 95 μg/cm2 276 μg/cm2
PM3 92 μg/cm2
PM2 162 μg/cm2
PM1 235 μg/cm2 343 μg/cm2
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CBM Workshop February 2008 Piotr Koczoń,GSI
QE Test Bench (HPD)- Air- 200 nm cut off- abs. QE measurement
Monochromator-Vacuum- deep UV- no absolute QE
Quantum efficiency measurements (theory)
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CBM Workshop February 2008 Piotr Koczoń,GSI
Monochromator
QE Test Bench
Quantum efficiency measurements (reality)
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CBM Workshop February 2008 Piotr Koczoń,GSI
PMs - Quantum Efficiencies
0
0,05
0,1
0,15
0,2
0,25
0,3
0,35
150 200 250 300 350 400 450 500 550 600 650 700
Wavelength [nm]
QE
PM1
PM2
PM3
PM4
PM5
PM1-TPB
PM2-TPB
PM3-TPB
PM4-TPB
PM5-TPB
PM1-pTer
PM4-pTer
PM5-pTer
TPB-Resin
YellowX-Evptd
YellowX-PowderPM4+QuarzGlas
QE for XP3102PRELIMINARY
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CBM Workshop February 2008 Piotr Koczoń,GSI
QE for XP3102 coated with TPB
PMs - Quantum Efficiencies
0
0,05
0,1
0,15
0,2
0,25
0,3
0,35
150 200 250 300 350 400 450 500 550 600 650 700
Wavelength [nm]
QE
PM1
PM2
PM3
PM4
PM5
PM1-TPB
PM2-TPB
PM3-TPB
PM4-TPB
PM5-TPB
PM1-pTer
PM4-pTer
PM5-pTer
TPB-Resin
YellowX-Evptd
YellowX-PowderPM4+QuarzGlas
PRELIMINARY
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CBM Workshop February 2008 Piotr Koczoń,GSI
QE for XP3102 coated with pTer
PMs - Quantum Efficiencies
0
0,05
0,1
0,15
0,2
0,25
0,3
0,35
150 200 250 300 350 400 450 500 550 600 650 700
Wavelength [nm]
QE
PM1
PM2
PM3
PM4
PM5
PM1-TPB
PM2-TPB
PM3-TPB
PM4-TPB
PM5-TPB
PM1-pTer
PM4-pTer
PM5-pTer
TPB-Resin
YellowX-Evptd
YellowX-PowderPM4+QuarzGlas
PRELIMINARY
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CBM Workshop February 2008 Piotr Koczoń,GSI
QE for XP3102 with YellowX
PMs - Quantum Efficiencies
0
0,05
0,1
0,15
0,2
0,25
0,3
0,35
150 200 250 300 350 400 450 500 550 600 650 700
Wavelength [nm]
QE
PM1
PM2
PM3
PM4
PM5
PM1-TPB
PM2-TPB
PM3-TPB
PM4-TPB
PM5-TPB
PM1-pTer
PM4-pTer
PM5-pTer
TPB-Resin
YellowX-Evptd
YellowX-PowderPM4+QuarzGlas
PRELIMINARY
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CBM Workshop February 2008 Piotr Koczoń,GSI
QE for XP3102 @ far UV
IA(λ) = F(λ) * QE(λ)
R(λ) = IAwls(λ)/ IA(λ) = QEwls(λ) / QE(λ)
QEwls(λ) = R(λ) * QE(λ) = IAwls(λ)/ IA(λ) * QE(λ)
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CBM Workshop February 2008 Piotr Koczoń,GSI
QE for XP3102 @ far UVComparison pTer / bare PM
0,00
100,00
200,00
300,00
400,00
500,00
600,00
700,00
800,00
900,00
100 150 200 250 300 350 400 450 500 550
Wavelength [nm]
Re
ala
tiv
e s
en
sit
ivit
y
PM1
PM4
PM5
PM1-pTer
PM4-pTer
PM5-pTer
for p-Ter
for TPB
Comparison_TPB-bare_PM
0,00
100,00
200,00
300,00
400,00
500,00
600,00
700,00
800,00
900,00
1000,00
100 150 200 250 300 350 400 450 500 550
Wavelength [nm]
Re
ala
tiv
e s
en
sit
ivit
y
PM1
PM2
PM3
PM4
PM5
PM1-TPB
PM2-TPB
PM3_TPB
PM4-TPB
PM5-TPB
IAwls(λ)/ IA(λ)
PRELIMINARY
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PM/PM-TPB/PM-TPB-QE
0,0
0,2
0,4
0,6
0,8
1,0
150 200 250 300 350 400 450 500 550
Wavelength [nm]
Re
lati
ve
in
ten
sit
y/Q
E
PM1-QE
PM2-QE
PM3-QE
PM4-QE
PM5-QE
PM1-TPB-norm
PM2-TPB-Norm
PM3-TPB-Norm
PM4-TPB-Norm
PM5-TPB-Norm
PM1-TPB-QE
PM2-TPB-QE
PM3-TPB-QE
PM4-TPB-QE
PM5-TPB-QE
CBM Workshop February 2008 Piotr Koczoń,GSI
QE for XP3102 @ far UV
PM-pTer / PM-pTer-QE
0,0
0,2
0,4
0,6
0,8
1,0
1,2
150 200 250 300 350 400 450 500 550
Wavelength [nm]
Re
lati
ve
in
ten
sit
y/Q
E
PM1-QE
PM4-QE
PM5-QE
PM1-pTer-norm
PM4-pTer-Norm
PM5-pTer-Norm
PM1-pTer-QE
PM4-pTer-QE
PM5-pTer-QE
for TPB
for p-Ter
PRELIMINARY
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CBM Workshop February 2008 Piotr Koczoń,GSI
Single photon counting capability (theory)
PM
HV
PulseGeneratorPico FADC
n grey filters
Light guide bundle
Lighttight box
LED
gate
signal
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CBM Workshop February 2008 Piotr Koczoń,GSI
Single photon counting capability (reality)
n times grey filter
Light guide bundle
Darkbox
LED
signalPulse generator(a bad one)
HV
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CBM Workshop February 2008 Piotr Koczoń,GSI
Single photon counting capability - results
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CBM Workshop February 2008 Piotr Koczoń,GSI
Single photon counting capability - results
Not convincing!!! A combined pulse-amplitude - time-series analysis necessary.
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CBM Workshop February 2008 Piotr Koczoń,GSI
Open questions:
WLS - ageing in CO2 – next measurement at CERN in June 2008- mechanical properties
Single Photon Counting - final proof for H8500
Cross-talk between neighbouring pixels (with and w/o WLS)
Readout- nXyter – April 2008- nXyter: adapter – charge divider
RICH-prototype for the test run in Fall´08
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CBM Workshop February 2008 Piotr Koczoń,GSI
Thank You !
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CBM Workshop February 2008 Piotr Koczoń,GSI