results from the pmt test bench in bcn (10-oct-03) j.garra, r.graciani, e.graugés, x.xirgu
TRANSCRIPT
![Page 1: Results from the PMT test bench in BCN (10-Oct-03) J.Garra, R.Graciani, E.Graugés, X.Xirgu](https://reader035.vdocuments.us/reader035/viewer/2022081520/56649e665503460f94b6121d/html5/thumbnails/1.jpg)
Results from the PMT test bench in BCN (10-Oct-03)
J.Garra, R.Graciani, E.Graugés, X.Xirgu
![Page 2: Results from the PMT test bench in BCN (10-Oct-03) J.Garra, R.Graciani, E.Graugés, X.Xirgu](https://reader035.vdocuments.us/reader035/viewer/2022081520/56649e665503460f94b6121d/html5/thumbnails/2.jpg)
8 stage PMT
CFD base: The output of 1 channel studied to
perform a premilinary analysis on: Signal Shape Gain Number of photo-electrons
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CFD active base
![Page 4: Results from the PMT test bench in BCN (10-Oct-03) J.Garra, R.Graciani, E.Graugés, X.Xirgu](https://reader035.vdocuments.us/reader035/viewer/2022081520/56649e665503460f94b6121d/html5/thumbnails/4.jpg)
Signal Shape
4600 4800 5000 5200 5400 5600 5800 6000 6200 6400
-0.040
-0.035
-0.030
-0.025
-0.020
-0.015
-0.010
-0.005
0.000
0.005
Sig
na
l
Units of time (aprox. 0.1 ns)
Signal taken with a recycled setup
Some oscillations in the signal shape are supposed to be caused by some connection(?) problem.
![Page 5: Results from the PMT test bench in BCN (10-Oct-03) J.Garra, R.Graciani, E.Graugés, X.Xirgu](https://reader035.vdocuments.us/reader035/viewer/2022081520/56649e665503460f94b6121d/html5/thumbnails/5.jpg)
Gain vs Photo-Statistics
0 20 40 60 80 100 120 140460000
480000
500000
520000
540000
560000
580000
600000
620000
Ga
in
Number of photoelectrons
Dependence gain-number of photoelectrons
• Possible saturation effects might be observed starting around 50 phe and above
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Gain
650 700 750 800 850 900
100000
1000000
2 = 500090665.89604
R2 = 0.99727 A = 1.3094E-15 ± 1.4236E-15B = 7.11223 ± 0.16104
Ga
in
-HV (V)
Dependence gain-source voltage
Our desired HV working point should be ~ 600 Volts obtaining an approximate gain of 30k to 50k
![Page 7: Results from the PMT test bench in BCN (10-Oct-03) J.Garra, R.Graciani, E.Graugés, X.Xirgu](https://reader035.vdocuments.us/reader035/viewer/2022081520/56649e665503460f94b6121d/html5/thumbnails/7.jpg)
8 stage PMT BCN base:
A preliminary study has been performed with a LED source (no fibre)
Gain and Photo-statistics have been looked at from the output of a 1 channel (#64)
Now the setup is ready to get measurements for all the channels at once.
Fatal accident ended up with the 8-stage PMT becoming unusable anymore
![Page 8: Results from the PMT test bench in BCN (10-Oct-03) J.Garra, R.Graciani, E.Graugés, X.Xirgu](https://reader035.vdocuments.us/reader035/viewer/2022081520/56649e665503460f94b6121d/html5/thumbnails/8.jpg)
BCN active base
![Page 9: Results from the PMT test bench in BCN (10-Oct-03) J.Garra, R.Graciani, E.Graugés, X.Xirgu](https://reader035.vdocuments.us/reader035/viewer/2022081520/56649e665503460f94b6121d/html5/thumbnails/9.jpg)
Signal Shape
4600 4800 5000 5200 5400 5600 5800 6000 6200 6400
-0.025
-0.020
-0.015
-0.010
-0.005
0.000
Sig
na
l
Units of time (aprox. 0.1 ns)
Signal with R6=R
7=R
8=0
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4600 4800 5000 5200 5400 5600 5800 6000 6200 6400-0.05
-0.04
-0.03
-0.02
-0.01
0.00
Sig
nal
Units of time (aprox. 0.1 ns)
Signal with R6=310 K, R
7=R
8=180 K
Signal Shape
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The oscillations present in the first attempt (CFD) could be partially removed (with the BCN base) by when the setup has been re-done very carefully and assuring a common grounding for the (ADC/Black Box/Active Base) system.
Still to be tried if that also cured the oscillation observed using the CFD base
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12 stage PMT This PMT has already incorporated the
active base by Hamamatsu together with the (PMT/Base) system encapsulation
Scans of 50x50 measurements each have been performed for different angles to ensure the geometrical consistency of the setup (PMT plane parallel to the fiber scaning plane): 0,90,180 and 360 deg. scans
Also scans with different light intensities have been taken to test the uniformity in the linear response of each channel.
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2D Scans
Different angles
Different light I
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To do list
Let the new team get more experienced
Complete a final version of the fine scans (Motor lost steps, etc…).
Understand any the level of saturation of the signal
Single photo-electron measurement using a 2-stage amplifier board (work in progress)