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Analysis of PMT Test Results: Performance and Optimization Study

Results from the PMT test bench in BCN on October 10, 2003, present findings on Signal Shape, Gain, and Photo-electrons in 8-stage PMT setups. The analysis reveals oscillations in the signal shape, gain saturation effects, and optimal operating points. The study includes comparisons between CFD and BCN bases, LED source experiments, and investigations on overcoming signal oscillations. Plans for 12-stage PMT tests and improvements in setup consistency are outlined, along with future tasks for signal saturation understanding and single photo-electron measurements.

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Analysis of PMT Test Results: Performance and Optimization Study

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  1. Results from the PMT test bench in BCN (10-Oct-03) J.Garra, R.Graciani, E.Graugés, X.Xirgu

  2. 8 stage PMT • CFD base: • The output of 1 channel studied to perform a premilinary analysis on: • Signal Shape • Gain • Number of photo-electrons

  3. CFD active base

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

  5. Gain vs Photo-Statistics • Possible saturation effects might be observed starting around 50 phe and above

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

  7. 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

  8. BCN active base

  9. Signal Shape

  10. Signal Shape

  11. 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. 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.

  13. 2D Scans • Different angles • Different light I

  14. 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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