PMT Testing

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


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)

PMT Measured 278Bad Linearity 0 0,0 %Bad Stability 27 9,7 %

Total 27 9,7 %


Batch 04 Inside Bench Temperature and Ref Amplitude

24

25

26

27

28

29

30

31

32

30/6/007/7/00

14/7/0021/7/00

28/7/00

Days

Tem

pera

ture

ins

ide

Ben

ch

0,800

0,850

0,900

0,950

1,000

1,050

Ref

eren

ce P

MT

Am

plit

ude

Temperature inside Test Bench Reference PMT Amplitude

Batch 06 Data for 278 PMTs


Results on 278 pmts of Batch 06

Compare Hamamatsu, LAL,IHEP Linearity at G=1.10**4

-4

-3

-2

-1

0

1

2

3

4

800 900 1000 1100Pmt

Dev

iati

on (

%)

G=1.10**4 LAL

G=1.10**4 HDS

G=1.10**4 IHEP



Linearity at 1.10**4

R2 = 0,80

-4

-3

-2

-1

0

1

2

3

4

-4 -2 0 2 4LAL

HA

MA

MA

TSU



Compare Hamamatsu, LAL,IHEP Linearity at G=1.10**4

-4

-3

-2

-1

0

1

2

3

4

0 10 20 30 40 50Pmt

Dev

iati

on (

%)

G=1.10**4 LAL

G=1.10**4 HDS

G=1.10**4 IHEP



Compare Hamamatsu,LAL,IHEP Amplitude Stability

-4

-3

-2

-1

0

1

2

3

4

800 900 1000 1100Pmt Number

Dev

iati

on (

%)

G=5.10**4 LAL

G=5.10**4 HDS



Amplitude Stability at 5.10**4

R2 = 0,71

-4

-3

-2

-1

0

1

2

3

4

-4 -2 0 2 4LAL

Ham

amat

su

Amplitude Stability at 5.10**4

R2 = 0,78

-4

-3

-2

-1

0

1

2

3

4

-4 -2 0 2 4LAL

Ham

amat

su

The 28 pmts measured in box 22 are very bad

278 pmts 250 pmts


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 0,80385 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

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


Comparison 4 and 2 criteria on G0

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

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

Nb

Hcal

Ecal

Ecal outer

Ecal Middle

Ecal Inner


Comparison between 4 and 2 criteria on G0

Selected G0

0

50

100

150

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

Nb

Hcal

Ecal

Ecal outer

Ecal Middle

Ecal Inner

Selected G0

0

50

100

150

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

Nb

Hcal

Ecal

Ecal outer

Ecal Middle

Ecal Inner


Comparison between 4 and 2 criteria on Green Luminous Index

Selected Green

0

50

100

150

200

12,00 14,00 16,00 18,00 20,00 Green Luminous I ndex

Nb

Hcal

Ecal

Ecal outer

Ecal Middle

Ecal Inner

Selected Green

0

50

100

150

200

12,00 14,00 16,00 18,00 20,00 Green Luminous I ndex

Nb

Hcal

Ecal

Ecal outer

Ecal Middle

Ecal Inner


Comparison between 4 and 2 criteria on Linearity

Selected Linearity

0

50

100

150

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

Nb

Hcal

Ecal

Ecal outer

Ecal Middle

Ecal Inner

Selected Linearity

0

50

100

150

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

Nb

Hcal

Ecal

Ecal outer

Ecal Middle

Ecal Inner


Comparison between 4 and 2 criteria on Linearity

Selected Stability

0

50

100

150

-2,0 -1,5 -1,0 -0,5 0,0 0,5 1,0 1,5 2,0 Stability

Nb

Hcal

Ecal

Ecal outer

Ecal Middle

Ecal Inner

Selected Stability

0

50

100

150

-2,0 -1,5 -1,0 -0,5 0,0 0,5 1,0 1,5 2,0 Stability

Nb

Hcal

Ecal

Ecal outer

Ecal Middle

Ecal Inner

PMT Testing

Documents

Transcript of PMT Testing