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Latest developments in Hamamatsu Large Format PMTs

Latest developments in Hamamatsu Large Format PMTs. VLVnT09 in October, 2009 Hamamatsu Photonics K.K. Electron Tube Division Yuji Hotta. Contents. 1. Profile of Hamamatsu 2. Developmental status for Large Format PMTs - 12 inch PMT - High QE - New photocathode

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Latest developments in Hamamatsu Large Format PMTs

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  1. Latest developments in Hamamatsu Large Format PMTs VLVnT09 in October, 2009 Hamamatsu Photonics K.K. Electron Tube Division Yuji Hotta

  2. Contents 1. Profile of Hamamatsu 2. Developmental status for Large Format PMTs - 12 inch PMT - High QE - New photocathode for low temperature operation

  3. Profile of Hamamatsu

  4. Where we are located ROLAND KAWAI Population : 824K (as of September, 2009) Hamamatsu is a name of a city. HONDA, YAMAHA and SUZUKI (famous motor cycle companies) are located in the same area.

  5. Global Network of Hamamatsu GREECE Europe JAPAN USA (Subsidiaries) (Subsidiaries) Japanese Standard MAP

  6. Hamamatsu Photonics K.K. Systems Division Solid Sate Division Electron Tube Division Established : Sept 29, 1953 Employees : 2,580 (As of Sept. 08) Net Sales : \99B ($950M) (FY2008) Central Research Lab Laser Group

  7. Developmental status for Large Format PMTs • - 12 inch PMT • - High QE • New photocathode • for low temperature operation

  8. Large Format PMTs 20 inch Application : Neutrino Experiment too large! 13 inch 10 inch 8 inch too small! too expensive!

  9. Development of12 inch PMT

  10. Development of 12 inch PMT

  11. Development of12 inch PMT 17 inch Glass Sphere 12 inch PMT Some space for divider

  12. Development of 12 inch PMT NEW! 10 inch PMT 12 inch PMT

  13. Development of12 inch PMT

  14. Development of12 inch PMT

  15. Development of12 inch PMT

  16. Development of12 inch PMT

  17. Development of12 inch PMT

  18. Developmental status for Large Format PMTs • - 12 inch PMT • - High QE • New photocathode • for low temperature operation

  19. High QE Bialkali Photocathode

  20. Definition of SBA/UBA R7600/R8900 1 inch Square Metal Package R9880 New TO-8 type Metal Package

  21. R7081 (10” PMT) with High QE

  22. R7081 (10” PMT) with High QE Average : 34% Sample : 404 pcs

  23. Developmental status for Large Format PMTs • - 12 inch PMT • - High QE • New photocathode • for low temperature operation

  24. 1/40 Development of Photocathode for Low Temperature • Purpose of development • Dark matter experiment • Liquid Xe : -110 deg. C / 175 nm emission • Liquid Ar : -186 deg. C / 128 nm emission to be converted to 420 nm photons by WLS • Photocathode with Al pattern • Photocathode with Pt underlay • QE becomes low due to decrease of transmittance

  25. Example QE datafor R5912 (8 inch) Pt underlay Low QE

  26. QE data of New Photocathode

  27. Cathode Linearity of New Photocathode

  28. R5912 (8 inch) with new photocathode

  29. Summary • Hamamatsu has been developing 12 inch PMT. Some sample PMTs will be available next year. • Hamamatsu continues to improve QE. • Hamamatsu has found new photocathode for low temperature operation. We are trying to apply the new photocathode for large format PMTs.

  30. END

  31. Back Up

  32. Metal Package PMTs Metal Channel Dynodes Micro processing technology R9880 <Cross-section> R7600 Array of Linear Focused Dynode Features Compact, Fast Time Response Position Sensitive Immunity to magnetic field 1 mm 1 mm

  33. R7600 & R8900 Various Anode Types Difference of R7600 & R8900 R7600 (R5900) R8900 4 channels M4 (2x2) 16 channels M16 (4x4) Y Focusing MCD X Proximity 64 channels M64 (8x8) Cross-Plate C12 (6+6) Multi-anode Fiber Coupling Imaging RICH (R7600-M64 only) (R8900-C12 only)

  34. Latest Data of R7600-200 (UBA) Example data with 10 tubes 41%~45% <<Specification>> Typical : 43 % Minimum : 38 % at peak Wavelength

  35. R6231-100 (2 inch) R6233-100 (3 inch) R3998-100 (1-1/8 inch) Conventional PMTs with SBA R877-100 (5”) is now available! Applications: Radiation detection Gamma Camera Radiation Probe For Better Energy Resolution

  36. Energy Resolution vs. QE

  37. HPD Compared with PMT <HPD> <PMT> AD (Avalanche Diode) EB GAIN : 1000~2000 AD GAIN : 30~100 DYNODE GAIN : 3~10 GAIN = 4x4x4x…x4x4x4 Total gain: ~1x105 Total gain: ~1x106

  38. Pulse Height Distribution <HPD> <PMT> K-APD = 12KV 1pe 1pe 2pe 2pe 3pe 4pe 5pe Prime Feature : Good Pulse Height Distribution

  39. Large Format HPD 280mm F330mm 13 inches AD Target : 5mm f TTS(FWHM) : 440 ps Development will be finished by spring 2012 <Collaboration> The Univ. of Tokyo and JST (JAPAN SCIENCE AND TECHNOLOGY AGENCY)

  40. EB Gain and Avalanche Gain Total : 2.3e+05 13 inch HPD

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