Boris Bobchenko, Tengiz Kvaratskheliya and Evgeni Tarkovski

Status of ITEP PMT test bench activity

• 200 PMTs were measured ( box2, box3, box4, box6 ).

• Only one PMT ( LA0007 ) was found to exceed the linearity limits at 104 gain in box2.

• For other boxes all measurements are present below for comparison.

-3

-2,5

-2

-1,5

-1

-0,5

0

0,5

1

1,5

2

2,5

3

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

2%0%-2%10000500001000000

Linearity test of PMTs from box 3

NONLINEARITY (%) RATE EFFECT (%)

N PMT G1 G2 G3 G1 G2 G3

5 LA0166 ,24 -,69 -2,2 ,86 -,41 -,43

48 ZL2600 ,6 ,9 2,1 ,33 ,32 -,55

50 ZL2606 -,5 -,5 -2,2 -,56 ,7 ,64

-3

-2,5

-2

-1,5

-1

-0,5

0

0,5

1

1,5

2

2,5

3

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

2%0%-2%10000500001000000

Linearity test of PMTs from box 4

-3

-2,5

-2

-1,5

-1

-0,5

0

0,5

1

1,5

2

2,5

3

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

2%0%-2%10000500001000000

Linearity test of PMTs from box 6

NONLINEARITY (%) RATE EFFECT (%)

N PMT G1 G2 G3 G1 G2 G3

11 LA0109 -2,4 -1,5 1,4 ,41 ,2 -,65

26 LA0686 -1,8 2,3 2,3 -,71 -,47 -,61

35 LA0709 1,7 2,4 -2,7 1 1 -1,1

-3

-2,5

-2

-1,5

-1

-0,5

0

0,5

1

1,5

2

2,5

3

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

2%

0

-2%

10000

50000

1000000

Rate effect test of PMTs from box 3

-3

-2,5

-2

-1,5

-1

-0,5

0

0,5

1

1,5

2

2,5

3

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

2%

0

-2%

10000

50000

1000000

Rate effect test of PMTs from box 4

-3

-2,5

-2

-1,5

-1

-0,5

0

0,5

1

1,5

2

2,5

3

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

2%

0

-2%

10000

50000

1000000

Rate effect test of PMTs from box 6

NONLINEARITY (%) RATE EFFECT (%)

N PMT G1 G2 G3 G1 G2 G3

34 LA0707 ,73 ,7 1,4 -2,5 1,8 -1,9

45 LA0736 -,44 -1,4 -1,8 -1,2 -1,5 -2,3

-1,5

-1

-0,5

0

0,5

1

1,5

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

1%

0%

-1%

10000

50000

1000000

Stability test of PMTs from box 3

-1,5

-1

-0,5

0

0,5

1

1,5

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

1%

0%

-1%

10000

50000

1000000

Stability test of PMTs from box 4

-1,5

-1

-0,5

0

0,5

1

1,5

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

1%

0%

-1%

10000

50000

1000000

Stability test of PMTs from box 6

Conclusions

1. 9 PMTs from 200 measured were found to exceed the linearity or rate effect limits.

2. From 9 bad tubes (8 of them were measured by Bernard) 3 PMTs are present in the LAL list of bad PMTs.

3. Only 2 PMTs ( LA0007, LA0109 ) has nonlinearity more 2 % at the gain 104 that was measured HAMAMATSU:

NONLINEARITY (%) RATE EFFECT (%)

PMT G1 G2 G3 G1 G2 G3

box2 LA0007 -2,3 -1,7 -1,3 ,66 ,76 -,5

box6 LA0109 -2,4 -1,5 1,4 ,41 ,2 -,65

4. For other 7 PMTs nonlinearity and rate effect exceed 2% level at higher gains (not measured by HAMAMATSU).