Results from the pmt test bench in bcn 10 oct 03
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Results from the PMT test bench in BCN (10-Oct-03). J.Garra, R.Graciani, E.Graugés, X.Xirgu. 8 stage PMT. CFD base: The output of 1 channel studied to perform a premilinary analysis on: Signal Shape Gain Number of photo-electrons. CFD active base. Signal Shape.

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Results from the PMT test bench in BCN (10-Oct-03)

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Results from the pmt test bench in bcn 10 oct 03

Results from the PMT test bench in BCN (10-Oct-03)

J.Garra, R.Graciani, E.Graugés, X.Xirgu


8 stage pmt

8 stage PMT

  • CFD base:

    • The output of 1 channel studied to perform a premilinary analysis on:

      • Signal Shape

      • Gain

      • Number of photo-electrons


Cfd active base

CFD active base


Signal shape

Signal Shape

  • Some oscillations in the signal shape are supposed to be caused by some connection(?) problem.


Gain vs photo statistics

Gain vs Photo-Statistics

  • Possible saturation effects might be observed starting around 50 phe and above


Results from the pmt test bench in bcn 10 oct 03

Gain

  • Our desired HV working point should be ~ 600 Volts obtaining an approximate gain of 30k to 50k


8 stage pmt1

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


Bcn active base

BCN active base


Signal shape1

Signal Shape


Signal shape2

Signal Shape


Results from the pmt test bench in bcn 10 oct 03

  • 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


12 stage pmt

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.


2d scans

2D Scans

  • Different angles

  • Different light I


To do list

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)


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