S. Hansen, S. Pordes & E. SkupR11065 study 10/1-6/2009 1 1st Look at FNAL at R11065 at room temperature. Plots of pulses on oscilloscope at different voltages.

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Presentation transcript:

S. Hansen, S. Pordes & E. SkupR11065 study 10/1-6/ st Look at FNAL at R11065 at room temperature. Plots of pulses on oscilloscope at different voltages in response to LED (~ 60 photo-electrons) with histograms of pulse-area: Calculation of gain from 1300 to 1600 Volts based on N (p.e.) = [mean pulse height / rms(pulse height)] 2 Plot of gain vs voltage Plots of linearity at 1300, 1400 & 1500 Volts up to 300 pC charge output. Bottom lines: gain at 1500 Volts is ~4.5 x 10 6 (1 pe = 0.7 pc) tube and base are linear up to 300 pC output

S. Hansen, S. Pordes & E. SkupR11065 study 10/1-6/ = 620 kOhm

S. Hansen, S. Pordes & E. SkupR11065 study 10/1-6/ Total R ~ 11.5 Mohm

S. Hansen, S. Pordes & E. SkupR11065 study 10/1-6/ Tube side of Base Outside of Base PMT with base Laser test box

S. Hansen, S. Pordes & E. SkupR11065 study 10/1-6/ Volts Volts Mean/ RMS(nVs) 0.347/ / / / / 0.49 ~pe’s gain0.94E61.4E62.4E64.6E68.1E6 Response to blue LED on TDS 5054 pulse-area histogram Led trigger PMT pulse pulse area Histogram mean and rms Pulse area = volts x seconds Charge (coulombs) = pulse-area/50 ohms 1500 Volts Integration window

S. Hansen, S. Pordes & E. SkupR11065 study 10/1-6/ PMTPhoto-Diodes PMTPhoto-Diodes Photo-DiodesPMT Linearity Study (Pulsed Laser /variable attenuator/monitored by 2 photodiodes) set light-attenuator at several positions

S. Hansen, S. Pordes & E. SkupR11065 study 10/1-6/ Volt Data

S. Hansen, S. Pordes & E. SkupR11065 study 10/1-6/ Volt Data

S. Hansen, S. Pordes & E. SkupR11065 study 10/1-6/ Volt Data