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4th Generartion PMT (8C28R3)


We pulsed the new 4th generation, 8-stage PMT (8C28R3) with a blue LED for one week at various pulser rep rates.  We took data for approximately 24 hour intervals.  In between each run we saved our data and printed out plots (this generally took us about half an hour).  The table below summarizes the basic features of the aging/rate tests carried out on this 8-stage PMT.
 
Run Number Number of Samples Cumulative Number of Samples LED Pulser Rep Rate (MHz) PMT Anode Charge per Run (C) Cumulative PMT Anode Charge (C)






501 
1201 
1202 
1426 
1205 
1232 
1145 
501 
1702 
2904 
4330 
5535 
6767 
7912 
5.0 
10.0 
10.0 
1.0 
10.0 
10.0 
10.0 
18.1 +/- 0.2 
89.7 +/- 1.0 
92.2 +/- 1.1 
10.9 +/- 1.0 
93.6 +/- 1.1 
96.2 +/- 1.1 
90.0 +/- 1.0 
18.1 +/- 0.2 
107.8 +/- 1.3 
200.0 +/- 2.3 
210.9 +/- 2.4 
304.4 +/- 3.5 
400.6 +/- 4.6 
490.7 +/- 5.7 


The following plots display the performance properties of the PMT as a function of sample number.  On these plots vertical lines have been used to denote the termination of one run and the beginning of another (i.e., the data before the first vertical line in each plot corresponds to 5.0 MHz pulsing, the data in between the first and the second vertical lines corresponds to 10.0 MHz pulsing, etc.).

  • PMT Temperature vs. Sample Number
  • <PD Charge> per pulse vs. Sample Number
  • <PMT Charge> per pulse vs. Sample Number
  • Sigma <PMT Charge> per pulse vs. Sample Number
  • <PMT Charge> / (Sigma <PMT Charge>) per pulse vs. Sample Number
  • <Number of Photoelectrons> per pulse vs. Sample Number
  • PMT Gain vs. Sample Number
These plots are linked here (Postscript).


We also created plots of the PMT performance properties as a function of cumulative anode charge. On these plots vertical lines have been used to denote the termination of one run and the beginning of another.

  • PMT Temperature vs. Cumulative Anode Charge
  • <PD Charge> per pulse vs. Cumulative Anode Charge
  • <PMT Charge> per pulse vs. Cumulative Anode Charge
  • Sigma <PMT Charge> per pulse vs. Cumulative Anode Charge
  • <PMT Charge> / (Sigma <PMT Charge>) per pulse vs. Cumulative Anode Charge
  • <Number of Photoelectrons> per pulse vs. Cumulative Anode Charge
  • PMT Gain vs. Cumulative Anode Charge
These plots are linked here (Postscript).



Measurements of the PMT performance properties were also plotted as a function of PMT HV after various points in the above cumulative anode charge studies.
  • <PMT Charge> per pulse vs. HV
  • Sigma <PMT Charge> per pulse vs. HV
  • <PMT Charge> / (Sigma <PMT Charge>) per pulse vs. HV
  • <Number of Photoelectrons> per pulse vs. HV
  • PMT Gain vs. HV
These plots are linked here (Postscript).