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2nd Generartion PMT (5M27C3)


We pulsed the 2nd generation PMT (5M27C3) with a blue LED for 7 runs at various pulser rep rates.  We took data for approximately 12 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 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)
1 
2 
3 
4 
5 
6 
7 		 637 
532 
595 
527 
578 
612 
602 		 637 
1169 
1764 
2291 
2869 
3481 
4083 		 0.0 
1.0 
10.0 
0.0 
1.0 
10.0 
0.0 		 0.0 +/- 0.0 
3.5 +/- 0.1 
34.2 +/- 0.4 
0.0 +/- 0.0 
3.3 +/- 0.1 
32.7 +/- 0.4 
0.0 +/- 0.0 		 0.0 +/- 0.0 
3.5 +/- 0.1 
37.8 +/- 0.5 
37.8 +/- 0.5 
41.1 +/- 0.5 
73.8 +/- 0.9 
73.8 +/- 0.9 


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 (e.g., the data before the first vertical line in each plot corresponds to 0.0 MHz pulsing).
  • 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).

In between runs, measurements of the PMT performance properties were taken as functions of PMT HV.  The following plots show the results.

  • <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).