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Measurements of some Crystals with PMT R&D on Calorimeters Jean Peyré Lund - June 2007

Measurements of some Crystals with PMT R&D on Calorimeters Jean Peyré Lund - June 2007. 1.Milano conclusions 2.Measurements of Energy resolution on CsI(Tl). Measurements with square PMT New measurements on St-Gobain Xtals Comparisons of St-Gobain Amcrys Scionnix.

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Measurements of some Crystals with PMT R&D on Calorimeters Jean Peyré Lund - June 2007

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  1. Measurements of some Crystals with PMTR&D on Calorimeters Jean PeyréLund - June 2007 IPNO-RDD-Jean Peyré

  2. 1.Milano conclusions2.Measurements of Energy resolution on CsI(Tl) • Measurements with square PMT • New measurements on St-Gobain Xtals • Comparisons of St-Gobain Amcrys Scionnix 3.Measurements with new Crystals • Energy measurements with LaBr3/LaCl3 4.Calorimeter Design • Design and prototype proposition • Work with St-Gobain on new Xtals 5.Conclusions IPNO-RDD-Jean Peyré

  3. 1.Milano conclusions2.Measurements of Energy resolution on CsI(Tl) • Measurements with square PMT • New measurements on St-Gobain Xtals • Comparisons of St-Gobain Amcrys Scionnix 3.Measurements with new Crystals • Energy measurements with LaBr3/LaCl3 4.Calorimeter Design • Design and prototype proposition • Work with St-Gobain on new Xtals 5.Conclusions IPNO-RDD-Jean Peyré

  4. 22x22x22 22x22x220 44x22x200 66x22x200 XP5300B 5,74% 6,70% 5,86% 6,57% APD S8664-1010 8,23% 9,39% XP1912 8,05% 9,40% 10,33% 12,28% Energy Resolutions CsI(Tl)+VM2000+APD/PMT+137Cs IPNO-RDD-Jean Peyré

  5. Use of XP1452 foreseen in 2006 • XP1452  38 mm (Active area 4x272mm2), green extended bialkaly • Quantum efficiency 30% at 420nm, 20% at 550nm • Size from 35mm to 50mm Next tests with XP1452 XP1452 IPNO-RDD-Jean Peyré

  6. Conclusions of Milano Oct 2006 • Collected light through long crystals is not constant. Tests with non collimated 137Cs source give resolutions greater that 15%. • The choice of VM2000 seems obvious • With XP1912, it seems difficult to have a resolution better than 9%-10% at 662keV on long crystals because: • Area covered by PMT is only 36% with 22x22 output face • Intrinsic resolution of crystal is quite high (~4/5%) • Photocathode is not green extended bialkaly • Resolution obtained with PMT XP1912 and APD are quite comparable until 3.25MeV • No work has been done on surface quality (polished/rough) • Use of XP1452 seems promising • Tests on LaCl3/LaCl3 crystals IPNO-RDD-Jean Peyré

  7. Conclusions of Milano Oct 2006 Calculated Resolutions Xtal 22x22x220 @550nm IPNO-RDD-Jean Peyré

  8. 1.Milano conclusions2.Measurements of Energy resolution on CsI(Tl) • Measurements with square PMT • New measurements on St-Gobain Xtals • Comparisons of St-Gobain Amcrys Scionnix 3.Measurements with new Crystals • Energy measurements with LaBr3/LaCl3 4.Calorimeter Design • Design and prototype proposition • Work with St-Gobain on new Xtals 5.Conclusions IPNO-RDD-Jean Peyré

  9. Case #2 : In Red : Crystal CsI(Tl) 22x22x22 In Black : PMT XP1452 Case #1 : In Red : Crystal CsI(Tl) 22x22x22 In Black : PMT XP1452 Measurements with Square PMT Calculated Resolutions Xtal 22x22x220 @550nm Measured reasult:6,42% Measured reasult:6,75% IPNO-RDD-Jean Peyré

  10. 1.Milano conclusions2.Measurements of Energy resolution on CsI(Tl) • Measurements with square PMT • New measurements on St-Gobain Xtals • Comparisons of St-Gobain Amcrys Scionnix 3.Measurements with new Crystals • Energy measurements with LaBr3/LaCl3 4.Calorimeter Design • Design and prototype proposition • Work with St-Gobain on new Xtals 5.Conclusions IPNO-RDD-Jean Peyré

  11. Results for PMT + 137Cs Crystal from St-Gobain 22x22x220 IPNO-RDD-Jean Peyré

  12. Results for PMT + 137Cs Crystal from St-Gobain 22x44x220 IPNO-RDD-Jean Peyré

  13. Results for PMT + 137Cs Crystal from St-Gobain 22x66x220 IPNO-RDD-Jean Peyré

  14. Results for PMT + 137Cs Crystal from St-Gobain 22x22x220 Crystal 22x22x220 Before modification by St Gobain Output face polished and others unpolished After modification by St Gobain Polished (brown), unpolished (red) IPNO-RDD-Jean Peyré

  15. Results for PMT + 137Cs Crystal from St-Gobain 22x44x200 & 22x66x200 Crystal 22x44x200 & 22x66x200 Before modification by St Gobain Output face polished and others unpolished After modification by St Gobain Polished (brown), unpolished (red) IPNO-RDD-Jean Peyré

  16. 1.Milano conclusions2.Measurements of Energy resolution on CsI(Tl) • Measurements with square PMT • New measurements on St-Gobain Xtals • Comparisons of St-Gobain Amcrys Scionnix 3.Measurements with new Crystals • Energy measurements with LaBr3/LaCl3 4.Calorimeter Design • Design and prototype proposition • Work with St-Gobain on new Xtals 5.Conclusions IPNO-RDD-Jean Peyré

  17. Results for PMT + 137Cs Crystal from Amcrys 22x22x220 IPNO-RDD-Jean Peyré

  18. Results for PMT + 137Cs Crystal from St-Gobain/Amcrys/Scionnix 22x22x220 IPNO-RDD-Jean Peyré

  19. St-Gobain Amcrys Scionnix 22x22x22 5,74% 5.96% 5,75% 22x22x220 6,71% 6,33% 6,29% Energy Resolutions CsI(Tl)+VM2000+PMT+137Cs Crystal from different companies with XP5300B IPNO-RDD-Jean Peyré

  20. 1.Milano conclusions2.Measurements of Energy resolution on CsI(Tl) • Measurements with square PMT • New measurements on St-Gobain Xtals • Comparisons of St-Gobain Amcrys Scionnix 3.Measurements with new Crystals • Energy measurements with LaBr3/LaCl3 4.Calorimeter Design • Design and prototype proposition • Work with St-Gobain on new Xtals 5.Conclusions IPNO-RDD-Jean Peyré

  21. LaBr3 & LaCl3 Crystals LaBr3 & LaCl3 Crystals from St –Gobain 1inch diam and 1inch length IPNO-RDD-Jean Peyré

  22. Energy Resolution of LaBr3 data from St-Gobain IPNO-RDD-Jean Peyré

  23. Energy Resolution of LaBr3 LaBr3 diam25x25 measured @ IPNO IPNO-RDD-Jean Peyré

  24. Energy Resolution for some Crystals CsI(Na) 137Cs XP5300B 22x22x22 60Co CsI(Tl) 22x22x22 LaCl3 Diam25x25 56Co Energy resolution LaBr3 Diam25x25 IPNO-RDD-Jean Peyré

  25. Energy Resolution for some Crystals CsI(Na) 137Cs XP5300B 22x22x22 60Co CsI(Tl) 22x22x22 LaCl3 Diam25x25 56Co @662keV Energy resolution 6800phé LaBr3 4700phé Diam25x25 10705phé 13172phé N:number of photo-electrons IPNO-RDD-Jean Peyré

  26. Energy Resolution you can obtain with CsI(Tl) With PMT: R: global resolution RS: scintillator resolution RM: Photomultiplier resolution v(M): variance of the PMT gain (~0,1) N: Number of photoelectrons IPNO-RDD-Jean Peyré

  27. “Intrisic” Energy Resolution for some Crystals R CsI(Tl) CsI(Na) R Rs Rs Energy resolution Energy resolution Rm Rm N:number of photo-electrons LaCl3 LaBr3 R Rs R Energy resolution Energy resolution Rs Rm Rm • The intrisic resolution is not constant with Energy and depends on root of the energy (1/root(E)) • Labr3 is the only Crystal whose resolution is not mainly dominated by the quality of the crystal (Rs) but also by collected light (N) IPNO-RDD-Jean Peyré

  28. Separation of peaks with Labr3 • For 60Co, 3 peaks at 3,202, 3,253 et 3,273 MeV. Is it possible to separate the first one from the others? 3.25MeV + 3.27Mev 2.74MeV 3.20MeV Nb of counts 3.45MeV Energy IPNO-RDD-Jean Peyré

  29. 3.25MeV + 3.27Mev 3.25MeV + 3.27Mev + 3.20MeV 3.20MeV Labr3 CsI(Tl) Nb of counts Nb of counts Energy Energy Separation of peaks for Labr3 & CsI(Tl) R1.4% @3.2MeV R3.6% @3.2MeV R2.8% @3.2MeV IPNO-RDD-Jean Peyré

  30. 1.Milano conclusions2.Measurements of Energy resolution on CsI(Tl) • Measurements with square PMT • New measurements on St-Gobain Xtals • Comparisons of St-Gobain Amcrys Scionnix 3.Measurements with new Crystals • Energy measurements with LaBr3/LaCl3 4.Calorimeter Design • Design and prototype proposition • Work with St-Gobain on new Xtals 5.Conclusions IPNO-RDD-Jean Peyré

  31. Possible Calorimeter Design Rectangular Crystals Square PMT (1 per 2 crystals) We have ordered 2 CsI(Tl) crystals from Scionnix. All material under test in September at IPNO (CsI(Tl)+Dual PMT) IPNO-RDD-Jean Peyré

  32. Possible Calorimeter DesignPrototype In 2008, construction of a prototype of 18 Xtals [CsI(Tl)] with 9 square PMT • Simulation and Tests of the prototype with different thickness of material in between the crystals depending on mechanical and physics considerations. IPNO-RDD-Jean Peyré

  33. 1.Milano conclusions2.Measurements of Energy resolution on CsI(Tl) • Measurements with square PMT • New measurements on St-Gobain Xtals • Comparisons of St-Gobain Amcrys Scionnix 3.Measurements with new Crystals • Energy measurements with LaBr3/LaCl3 4.Calorimeter Design • Design and prototype proposition • Work with St-Gobain on new Xtals 5.Conclusions IPNO-RDD-Jean Peyré

  34. Study of thin envelops for LaBr3 Xtals with Saint-Gobain Try to realise a prototype of 20x20x20 mm3 with St-Gobain LaBr3 inside a carbon alveol to reduce the thickness of envelop 2mm -> <0.5mm Leakage He Test of carbon alveol with aluminium foil (200μm+30μm) IPNO-RDD-Jean Peyré

  35. 1.Milano conclusions2.Measurements of Energy resolution on CsI(Tl) • Measurements with square PMT • New measurements on St-Gobain Xtals • Comparisons of St-Gobain Amcrys Scionnix 3.Measurements with new Crystals • Energy measurements with LaBr3/LaCl3 • Time measurements with LaBr3/LaCl3/BaF2 4.Calorimeter Design • Design and prototype proposition • Work with St-Gobain on new Xtals 5.Conclusions IPNO-RDD-Jean Peyré

  36. Conclusions CsI(Tl) • For CsI(Tl), the basic resolution for different manufacturers is quite comparable for small Crystals, but the wrapping and opticical treatement for long crystals seem at that time to be a very difficult science for St Gobain • Energy resolution of 5/5.5% seams reachable with XP1452 at 1MeV New Crystals • Even if Labr3/LaCl3 is very promising, St Gobain seems at that time to have great difficulties to make long crystals. • Good Energy and Time resolution on small Crystals • There are no competitors on this market at that time • Are they interested by designing special crystals for physics experiments ? Calorimeter Design • Prototype of 18 Crystals for test and simulation in lab IPNO-RDD-Jean Peyré

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