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PMT Testing

PMT Testing. Results on Batch 6 on 278 pmts Selection based on 4 criteria Ecal/ Hcal selection based on 2 criteria Comparison of the two criteria. Results on Batch 06. 278 pmts presently measured

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PMT Testing

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  1. PMT Testing Results on Batch 6 on 278 pmts Selection based on 4 criteria Ecal/ Hcal selection based on 2 criteria Comparison of the two criteria Bernard JEAN-MARIE Pmt Group Meeting

  2. Results on Batch 06 • 278 pmts presently measured • Good correlation for both linearity and stability. The temperature stabilization of the LED pulse is probably responsible for the improvement. • 2 boxes appear to contains “ reprocessed pmts “ there stability is quite different • Measurement on stability (and linearity) is more sensitive than the Hamamatsu ones. This lead to reject around 10% of the pmts. • One pmt was measured with a large dark current ( need to re-measurement) Bernard JEAN-MARIE Pmt Group Meeting

  3. Bernard JEAN-MARIE Pmt Group Meeting

  4. Results on 278 pmts of Batch 06 Bernard JEAN-MARIE Pmt Group Meeting

  5. Results on 278 pmts of Batch 06 Bernard JEAN-MARIE Pmt Group Meeting

  6. Results on 278 pmts of Batch 06 Bernard JEAN-MARIE Pmt Group Meeting

  7. Results on 278 pmts of Batch 06 Bernard JEAN-MARIE Pmt Group Meeting

  8. Results on 278 pmts of Batch 06 The 28 pmts measured in box 22 are very bad 278 pmts 250 pmts Bernard JEAN-MARIE Pmt Group Meeting

  9. Remarks • Need to make a selection “on the fly “ to equipped Hcal and Ecal modules • Need to define criteria such that no pmts are left behind. All the pmts must be used (except for the spare ones obviously). But all the pmts are within the specifications. • Need to define common rules accepted by everybody to dispatch them between ECAL/HCAL and inside ECAL or HCAL? • Which criteria? • Ecal/ Hcal major requirements are perfectly compatible. • For Ecal Low quantum efficiency, highest voltage for a given gain. • For Hcal High quantum efficiency, lowest voltage for a given gain. • Should we include Linearity and Stability: not obvious • Two examples: • A global one based on 4 probabilities call G0, Green, Linearity and Stability. • A simpler one based on G0 and Grenn only to separate between Ecal and Hcal. Bernard JEAN-MARIE Pmt Group Meeting

  10. Selection based on 4 probabilities • Use Hamamatsu Datasheets for 4050 pmts presently delivered • Method: build a probability to sort the best for inner Ecal. • G0: ABS((G0-G0min)/(G0max-G0min)-1) • eg: ABS((e-emin)/(emax-emin)-1) • Lin: ((ABS(Lin)/2)*(-1)) +1 @ 104 • Stab: ((ABS(Stab)/2)*(-1)) +1 @5.104 • Global probability =P(G0) x P(eg) x P(Lin) x P(Stab) • There is the possibility to introduce a weight between the 4 components Bernard JEAN-MARIE Pmt Group Meeting

  11. PMT Selection (2) Bernard JEAN-MARIE Pmt Group Meeting

  12. Probability distribution • Repartition between ECAL / HCAL • Ecal 6016 pmts 0,80385 • Hcal 1468 pmts 0.19615 • Repartition inside ECAL • Inner 1536 0.20524 25.53% • Middle 1792 0.23944 29.79% • Outer 2688 0.35912 44.68% • Cut on probability 4 criteria: • Hcal 0 to 0.09 • Ecal Outer 0.09 to 0.185 • Ecal Middle 0.185 to 0.280 • Ecal Inner 0.280 to Max • Cut on probability 2 criteria: Between Ecal / Hcal • Hcal 0 to 0.2153 • Ecal 0.2153 to Max 2 criteria inside Ecal • Ecal Outer 0. to 0.4229 • Ecal Middle 0.4229 to 0.6154 • Ecal Inner 0.6154 to Max Bernard JEAN-MARIE Pmt Group Meeting

  13. Cumulative Probability distribution Bernard JEAN-MARIE Pmt Group Meeting

  14. Result of selection with 4 criteria • Best for Ecal inner is well selected • Due to the method, distributions on parameters are smooth. No clear cut between categories • Hcal criteria are not fully met • Its ok for dispatching pmts inside Ecal Bernard JEAN-MARIE Pmt Group Meeting

  15. Result of selection with 4 criteria Bernard JEAN-MARIE Pmt Group Meeting

  16. Result of selection with 4 criteria Bernard JEAN-MARIE Pmt Group Meeting

  17. Result of selection with 4 criteria Bernard JEAN-MARIE Pmt Group Meeting

  18. Result of selection with 4 criteria Bernard JEAN-MARIE Pmt Group Meeting

  19. Result of selection with 4 criteria Bernard JEAN-MARIE Pmt Group Meeting

  20. Result of selection with 4 criteria Bernard JEAN-MARIE Pmt Group Meeting

  21. Selection based on 4 probabilities • Use Hamamatsu Datasheets for 4050 pmts presently delivered • Method: build a probability to sort the best for inner Ecal. • G0: ABS((G0-G0min)/(G0max-G0min)-1) • eg: ABS((e-emin)/(emax-emin)-1) • Global probability =P(G0) x P(eg) Bernard JEAN-MARIE Pmt Group Meeting

  22. PMT Selection Based on 2 criteria (2) G0-Luminous index Correlation 12 HCAL 10 Hcal 8 G0 6 4 Ecal Inner 2 HCAL ECAL 0 10 12 14 16 18 20 Cathode Blue Luminous Index Bernard JEAN-MARIE Pmt Group Meeting

  23. Result of selection with 2 criteria Bernard JEAN-MARIE Pmt Group Meeting

  24. Result of selection with 2 criteria Bernard JEAN-MARIE Pmt Group Meeting

  25. Result of selection with 2 criteria Bernard JEAN-MARIE Pmt Group Meeting

  26. PMT Selection (2) Inner ECAL Bernard JEAN-MARIE Pmt Group Meeting

  27. Result of selection with 2 criteria Bernard JEAN-MARIE Pmt Group Meeting

  28. Comparison 4 and 2 criteria on G0 Bernard JEAN-MARIE Pmt Group Meeting

  29. Comparison between 4 and 2 criteria on G0 Bernard JEAN-MARIE Pmt Group Meeting

  30. Comparison between 4 and 2 criteria on Green Luminous Index Bernard JEAN-MARIE Pmt Group Meeting

  31. Comparison between 4 and 2 criteria on Linearity Bernard JEAN-MARIE Pmt Group Meeting

  32. Comparison between 4 and 2 criteria on Linearity Bernard JEAN-MARIE Pmt Group Meeting

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