PMT Testing

24-06-2004 Bernard JEAN-MARIE Pmt Group Meeting 1

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 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.


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)/(G0

max-G0min)-1)

g: ABS((-min)/(max-min)-1)

Lin: ((ABS(Lin)/2)*(-1)) +1 @ 104

Stab: ((ABS(Stab)/2)*(-1)) +1 @5.104

Global probability = P(G0) x P(g) x P(Lin) x P(Stab) There is the possibility to introduce a weight between the 4 components


PMT Selection (2)

G0- HV

0

2

4

6

8

10

12

850 900 950 1000 1050 1100 1150 1200 1250

HV at 5.104

G0


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

Probability Distribution

0

50

100

150

200

250

300

350

0,0 0,1 0,1 0,2 0,2 0,3 0,4 0,4 0,5 0,5 0,6 0,7Probability

Num

ber

of

pmts

Hamamatsu Data for all Delivered PMTs


Cumulative Probability distribution

Cumulative pmt proba

0,00

20,00

40,00

60,00

80,00

100,00

0,00 0,10 0,20 0,30 0,40 0,50 0,60Selection Probability

Nb

in %

Hamamatsu Data for all Delivered PMTs Hamamatsu Data for all Delivered PMTs

HCAL ECAL

OUTER MIDDLE INNER


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



Proba- G0

Hcal Hcal

Outer Outer

Middle Middle

Inner Inner

0,0

0,1

0,2

0,3

0,4

0,5

0,6

0,7

1 3 5 7 9 11G0

Prob

a




Proba- Luminous index

Hcal Hcal

Outer Outer

Middle Middle

Inner Inner

0,0

0,1

0,2

0,3

0,4

0,5

0,6

0,7

12 13 14 15 16 17 18 19 20Cathode Green Luminous I ndex

Prob

a




Proba- Linearity

Hcal Hcal

Outer Outer

Middle Middle

Inner Inner

0,0

0,1

0,2

0,3

0,4

0,5

0,6

0,7

0,8

-2,0 -1,5 -1,0 -0,5 0,0 0,5 1,0 1,5 2,0Linearity

Prob

a




Proba / Gain Stability

Hcal Hcal

Outer Outer

Middle Middle

Inner Inner

0,0

0,1

0,2

0,3

0,4

0,5

0,6

0,7

0,8

-2,00 -1,50 -1,00 -0,50 0,00 0,50 1,00 1,50 2,00Gain Stability

Prob

a




Linearity

0

10

20

30

40

50

60

70

80

90

100

110

120

130

-2,00 -1,00 0,00 1,00 2,00 Linearity

Nb

Hcal

Ecal Inner

Ecal Outer

Cathode Green Luminous index

0

10

20

30

40

50

60

70

80

90

100

110

120

130

12,00 14,00 16,00 18,00 20,00Cathode Green

Nb

Hcal

Ecal Inner



Selected G0

0

10

20

30

40

50

60

70

80

90

100

110

120

1,00 3,00 5,00 7,00 9,00 11,00 G0

Nb

Hcal

Ecal Inner


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)/(G0

max-G0min)-1)

g: ABS((-min)/(max-min)-1)

Global probability = P(G0) x P(g)


PMT Selection Based on 2 criteria (2)

G0-Luminous index Correlation

0

2

4

6

8

10

12

10 12 14 16 18 20Cathode Blue Luminous Index

G0

ECAL HCAL

HCAL



Probability Distribution

0

50

100

150

200

250

300

0,0 0,1 0,1 0,2 0,2 0,3 0,4 0,4 0,5 0,5 0,6 0,7Probability

Num

ber

of

pmts


Cumulative pmt proba

0

20

40

60

80

100

0,0 0,1 0,2 0,3 0,4 0,5 0,6Selection Probability

Nb

in %

Hamamatsu Data for all Delivered PMTs Hamamatsu Data for all Delivered PMTs

HCAL ECAL



Proba- Luminous index

Hcal Hcal

0,0

0,1

0,2

0,3

0,4

0,5

0,6

0,7

12 13 14 15 16 17 18 19 20Cathode Green Luminous I ndex

Prob

a




Proba- G0

Hcal Hcal

0,0

0,1

0,2

0,3

0,4

0,5

0,6

0,7

1 3 5 7 9 11G0

Prob

a



PMT Selection (2)

Linearity at 1.10**4

-2,0

-1,6

-1,2

-0,8

-0,4

0,0

0,4

0,8

1,2

1,6

2,0

0 500 1000 1500 2000 2500Pmt Number

%

Inner ECAL



Selected G0

0

50

100

150

200

250

300

350

400

1,00 3,00 5,00 7,00 9,00 11,00 G0

Nb

Hcal

Ecal

Selected G0

0

50

100

150

200

250

300

350

400

1,00 3,00 5,00 7,00 9,00 11,00 G0

Nb

Hcal

Ecal Inner

Ecal



Green Luminous index

0

50

100

150

200

250

300

350

400

450

12,00 14,00 16,00 18,00 20,00Green

Nb

Hcal

Ecal

Cathode Green Luminous index

0

50

100

150

200

250

300

350

400

450

12,00 14,00 16,00 18,00 20,00Cathode Green

Nb

Hcal

Ecal Inner

Ecal

PMT Testing

Documents

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