Download 10 - CERN Indico

Test of microchannel plates in magnetic field up to 4.5 T.
A.Yu. Barnyakov, M.Yu. Barnyakov, S.V. Karpov, A.A. Katcin, V.G. Prisekin
Budker Institute of Nuclear Physics, Novosibirsk, Russia
Novosibirsk State University, Novosibirsk, Russia
Novosibirsk MCP PMT design
Data processing
• Multialkali photocathode
• 2MCP with ∅10µm channels
• 2MCP with ∅8µm channels
• 2MCP with ∅6µm channels
• 2MCP with ∅3.5µm channels, L/∅~90
• 3MCP with ∅8µm channels
Amplitude, ch
•  Integrated charge of single
photoelectron signals is used
for gain evaluation
•  Linear fit of signal front is
used for time determination.
•  Time of signal is determined as
inCFDatthe½ofamplitude
3500
χ2 / ndf
8.052 / 10
p0
−1.38e+04 ± 575
p1
338.6 ± 11.62
PC
σT, ps
σT, ps
γ
GENERATOR
1500
ΔT
1000
25
15
10
5
0
0
500
1000
1500
2000
2500
3000
Amplitude, ch
150
50
100
150
200
Time, ns
To minimize systematic
time dependence on signal
amplitude the amplitude is
adjusted to 1000ch of
digitizer with help of
attenuator (0÷40 dB)
40
30
200
PMT signal
500
20
MCP1
365.1 ± 2.955
2000
35
250
p1
2500
Setup
• Magnet bore – ∅120mm
• Stable operation up to 4.5 T
B
• Inhomogeneity of field in central part
with ø5cm <0.6%
• Light source is PiLas (λ=823nm; pulse
FWHM=35ps; sync jitter 4ps)
• Digitizer CAEN V1742 (DRS4)
• Preamplifier CAEN(1.5GHz) – 45dB
PiLas sync
3000
0
PiLas: tpulse=30ps; TRG jitter ~ 4ps; λ=409 nm300
χ 2 / ndf
0.2769 / 2
p0
− 4.856e+04 ± 401
MCP2
100
50
+φ
−φ
0
0
CAEN ADC V1742 (DRS4)
500
1000
1500
2000
2500
3000
Aplutude, ch
Impact of electronic and procedure
Gain of MCP PMTs in strong magnetic field
10−1
10−2
PMT9424(8µ m)
PMT9515(8µ m)
10
−3
0
0.5
1
1.5
2
2.5
3
3.5
4
10
4.5
Magnetic Field, T
0
0.5
1
1.5
PMT115(6µm)
PMT75(6µm)
−3
2
2.5
3
3.5
4
10
4.5
Magnetic Field, T
0
0.5
1
10−2
1.5
2
2.5
3
3.5
4
4.5
Magnetic Field, T
PMT557(8µm; 3MCP) U =2.8kV
MCP
PMT557(8µm; 3MCP) U =3.0kV
PMT74423(3.5µm; L/d=90)
−3
10
1
10−1
10−2
10−2
PMT80565(10µm)
PMT82015(10µm)
1
10−1
10−1
10−2
−3
1
Relative Gain
10−1
1
Relative Gain
1
Relative Gain
Relative Gain
Relative Gain
Initial Gain(0 T) ≈ 2÷5Ÿ106
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
10−3
Magnetic Field, T
MCP
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Magnetic Field, T
Gain decrease at 4T:
2MCP, 10µm – 25÷30 times
2MCP, 8µm – 14÷17 times
2MCP, 6µm – 4÷5 times
2MCP, 3.5µm(L/∅~90) – 20 times
3MCP, 8µm – 80÷90 times
Timing properties in magnetic field
2MCP, 10µm
2MCP, 8µm
2MCP, 6µm
σT(4T)~40ps
σT(4T)~45÷55ps
σT(4T)~40ps
80
σT(4T)~50÷60ps
PMT115(6µm)
90
PMT75(6µm)
80
100
σT, ps
80
PMT9424(8µm)
PMT9515(8µm)
90
σT(4T)~36ps
σT, ps
PMT82015(10µm)
σT, ps
σT, ps
PMT80565(10µm)
90
3MCP, 8µm
100
100
100
PMT74423(3.5µ m; L/d=90)
90
80
90
80
70
70
70
70
70
60
60
60
60
60
50
50
50
50
50
40
40
40
40
40
30
30
30
30
30
20
20
20
20
20
10
10
10
10
10
PMT557(8µ m; 3MCP) U =2.8kV
MCP
PMT557(8µ m; 3MCP) U =3.0kV
MCP
0
0
0.5
1
1.5
2
2.5
3
3.5
4
0
4.5
Magnetic Field, T
0
0.5
1
1.5
2
2.5
3
3.5
4
0
4.5
Magnetic Field, T
0
0.5
1
1.5
2
2.5
3
3.5
4
0
4.5
Magnetic Field, T
0
0.5
1
1.5
2
2.5
3
3.5
4
0
4.5
Magnetic Field, T
0
0.5
1
1.5
2
2.5
3
3.5
4
1
10−1
100
Angle 0
o
Angle +20
o
Angle +30
o
Angle -20
o
Angle -30
o
Angle -40
o
Angle -50
1.4
1.2
90
80
70
1
60
0.8
50
40
0.6
o
Angle 0
σT, ps
Relative efficiency
Angular dependence of 2MCP, 6µm PMT properties on magnetic field
o
o
Angle +20
o
Angle +20
o
Angle +30
0.4
o
Angle -20
20
1
1.5
2
2.5
3
3.5
4
4.5
Magnetic Field, T
0
Angle -40
10
o
Angle -50
0.5
o
Angle -30
o
0.2
o
Angle -40
0
o
Angle -20
o
Angle -30
10−2
o
Angle +30
30
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Magnetic Field, T
VCI2016 - The 14th Vienna Conference on Instrumentation
0
o
Angle -50
0
0.5
1
1.5
2
2.5
3
3.5
4.5
Magnetic Field, T
Time resolution is presented without electronic impact subtraction
Relative Gain
σT, ps
100
2MCP, 3.5µm@L/∅~90
4
4.5
Magnetic Field, T