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PMT Testing

PMT Testing. Selection based on 4 criteria Ecal/ Hcal selection based on 2 criteria. Remarks. Need to make a selection “on the fly “ to equipped Hcal and Ecal modules

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PMT Testing

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  1. PMT Testing Selection based on 4 criteria Ecal/ Hcal selection based on 2 criteria Bernard JEAN-MARIE Pmt Group Meeting

  2. 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

  3. 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

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

  5. Probability distribution • Repartition between ECAL / HCAL • Ecal 6016 pmts 0,804 • Hcal 1468 pmts 0.196 • Repartition inside ECAL • Inner 1536 0.205 • Middle 1792 0.239 • Outer 2638 0.358 • Cut on probability: • Hcal 0 to 0.09 • Ecal Outer 0.09 to 0.185 • Ecal Middle 0.185 to 0.280 • Ecal Outer 0.280 to Max Bernard JEAN-MARIE Pmt Group Meeting

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

  7. 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

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

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

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

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

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

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

  14. 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

  15. 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

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

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

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

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

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

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

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