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Boris Bobchenko, Tengiz Kvaratskheliya and Evgeni Tarkovski Status of ITEP PMT test bench activity

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 10 4 gain in box2.

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Boris Bobchenko, Tengiz Kvaratskheliya and Evgeni Tarkovski Status of ITEP PMT test bench activity

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  1. 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.

  2. 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. Linearity test of PMTs from box 4

  4. 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

  5. Rate effect test of PMTs from box 3

  6. Rate effect test of PMTs from box 4

  7. 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

  8. Stability test of PMTs from box 3

  9. Stability test of PMTs from box 4

  10. Stability test of PMTs from box 6

  11. Conclusions • 9 PMTs from 200 measured were found to exceed the linearity or rate effect limits. • From 9 bad tubes (8 of them were measured by Bernard) 3 PMTs are present in the LAL list of bad PMTs. • 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).

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