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Illustration of the single PE technique to measure the gain of a M64 (H7546A) Multianode PMT

Illustration of the single PE technique to measure the gain of a M64 (H7546A) Multianode PMT. Wallace Raposo, Mario Vaz & Luis Villaseñor. Angra Meeting 4-5 Dec. 2008 Campinas. LED Pulser Prototype. LED activating Pulse (25 ns/div) ‏. Noise. 2 PE. 1 PE. Pulses within 20 ns of

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Illustration of the single PE technique to measure the gain of a M64 (H7546A) Multianode PMT

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  1. Illustration of the single PEtechnique to measure the gain of a M64 (H7546A) Multianode PMT Wallace Raposo, Mario Vaz & Luis Villaseñor Angra Meeting 4-5 Dec. 2008 Campinas

  2. LED Pulser Prototype LED activating Pulse (25 ns/div)‏

  3. Noise 2 PE 1 PE Pulses within 20 ns of right window border (Q miscalulated)‏

  4. We get ~ twice the charge

  5. Final Remark 1. H7546A From the datasheet we expect G=2x10^6 at 950 V We have measured G=3.2x10^6

  6. Final Remark 2. For V<1.1 mV we get 40199 events For V>1.1 mV we get 4398 Therefore the mean value of our Poisson distribution is 4398/40199 = 0.109 Based on this number we expect 4398*0.109/2 = 240 double PEs. From a previous plot the MPV for Single PE amplitude is ~ 1.75 mV, if we cut at Amplitude > 3.5 we get 234 events, i.e. in good agreement.

  7. Final Remark 3. From a previous plot the mean value for the Q distribution noise is 0.15 pC with a sigma of 0.1 pC, i.e. the mean value is 30% of the mean PE charge we got at HV=950 V. We conclude that this method will not work for lower HV for which G < 10^6.

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