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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

PMT Testing

Selection based on 4 criteria

Ecal/ Hcal selection based on 2 criteria

Bernard JEAN-MARIE Pmt Group Meeting


Remarks
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


Selection based on 4 probabilities
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


Pmt selection 2
PMT Selection (2)

Bernard JEAN-MARIE Pmt Group Meeting


Probability distribution
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


Cumulative probability distribution
Cumulative Probability distribution

Bernard JEAN-MARIE Pmt Group Meeting


Result of selection with 4 criteria
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


Result of selection with 4 criteria1
Result of selection with 4 criteria

Bernard JEAN-MARIE Pmt Group Meeting


Result of selection with 4 criteria2
Result of selection with 4 criteria

Bernard JEAN-MARIE Pmt Group Meeting


Result of selection with 4 criteria3
Result of selection with 4 criteria

Bernard JEAN-MARIE Pmt Group Meeting


Result of selection with 4 criteria4
Result of selection with 4 criteria

Bernard JEAN-MARIE Pmt Group Meeting


Result of selection with 4 criteria5
Result of selection with 4 criteria

Bernard JEAN-MARIE Pmt Group Meeting


Result of selection with 4 criteria6
Result of selection with 4 criteria

Bernard JEAN-MARIE Pmt Group Meeting


Selection based on 4 probabilities1
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


Pmt selection based on 2 criteria 2
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


Result of selection with 2 criteria
Result of selection with 2 criteria

Bernard JEAN-MARIE Pmt Group Meeting


Result of selection with 2 criteria1
Result of selection with 2 criteria

Bernard JEAN-MARIE Pmt Group Meeting


Result of selection with 2 criteria2
Result of selection with 2 criteria

Bernard JEAN-MARIE Pmt Group Meeting


Pmt selection 21
PMT Selection (2)

Inner ECAL

Bernard JEAN-MARIE Pmt Group Meeting


Result of selection with 2 criteria3
Result of selection with 2 criteria

Bernard JEAN-MARIE Pmt Group Meeting


Result of selection with 2 criteria4
Result of selection with 2 criteria

Bernard JEAN-MARIE Pmt Group Meeting


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