CBM-RICH: Photodetector developement CBM Collaboration Meeting February 2008 P.Koczoń, C.Höhne,...
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Transcript of CBM-RICH: Photodetector developement CBM Collaboration Meeting February 2008 P.Koczoń, C.Höhne,...
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
CBM Workshop February 2008 Piotr Koczoń,GSI
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
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
CBM Workshop February 2008 Piotr Koczoń,GSI
Wave-length shifter
p-TerphenylpTer
TetraphenylButadiene TPB
CBM Workshop February 2008 Piotr Koczoń,GSI
Coating plant (theory)
Schutter
Boat
PMs
Heating
Vacuum
Quartz crystal microbalance
Material
CBM Workshop February 2008 Piotr Koczoń,GSI
Coating plant (reality)
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
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)
CBM Workshop February 2008 Piotr Koczoń,GSI
Monochromator
QE Test Bench
Quantum efficiency measurements (reality)
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
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
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
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
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)
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
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
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
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
CBM Workshop February 2008 Piotr Koczoń,GSI
Single photon counting capability - results
CBM Workshop February 2008 Piotr Koczoń,GSI
Single photon counting capability - results
Not convincing!!! A combined pulse-amplitude - time-series analysis necessary.
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
CBM Workshop February 2008 Piotr Koczoń,GSI
Thank You !
CBM Workshop February 2008 Piotr Koczoń,GSI