Introduction to ET Enterprises Ltd Brief History Product Range Main Applications

1. Introduction to ET Enterprises Ltd • Brief History • Product Range • Main Applications • Recent Developments • Current and Past projects • Summary of Capability VLVnT08 – Toulon April 2008 bbbbb

2. Introduction to ET Enterprises Ltd ET Enterprises LimitedBury streetRuislipHA4 7TAUnited Kingdom phone:   +44 (0)1895 630773fax:   +44 (0)1895 631774 web:  http://www.et-enterprises.com e-mail:  info@electron-tubes.co.uk VLVnT08 – Toulon April 2008 bbbbb

3. Introduction to ET Enterprises Ltd ET Enterprises Limited is a newly formed company which has taken over the photomultiplier and accessories business of Electron Tubes Limited and will continue to manufacture, supply and develop the Electron Tubes brand product range. VLVnT08 – Toulon April 2008 bbbbb

4. Introduction to ET Enterprises Ltd Ludlum Instruments Inc. Sweetwater, Texas ADIT Pmts Sweetwater ELJEN Sweetwater ET Enterprises Ruislip UK VLVnT08 – Toulon April 2008 rrrrrrrrrrrrrrrrrrrrrrbbbbb

5. Introduction to ET Enterprises Ltd • ET Enterprises will benefit from the additional volume production facilities of ADIT. • The more specialised pmts will continue to be made in the UK at the same location as our Development facility. VLVnT08 – Toulon April 2008 bbbbb

6. Introduction to ET Enterprises Ltd • Combined resources of the two operations will enable the new company to extend its penetration into higher volume, lower cost markets • Benefit from ET Enterprises’ knowledge and experience in many different photomultiplier applications worldwide. VLVnT08 – Toulon April 2008 rrrrrrrrrrrrrrrrrrrrrrbbbbb

7. Brief History As EMI Electron Tubes Ltd: 1940s: First pmt photon counting system 1970s: First large hemispherical pmt (5 inch) As Thorn EMI Electron Tubes Ltd 1980s: First low background glass pmts Rugged pmts for space applications 1990s: First small (1 inch) hemispherical pmts First ultra-low background glass pmts VLVnT08 – Toulon April 2008 rrrrrrrrrrrrrrrrrrrrrrbbbbb

8. Brief History As Electron Tubes Ltd: 1995: High performance pmt modules X-Ray detection systems 2000: Ultra -low temperature pmts 2005: Signal processing electronics ET Enterprises Ltd – from May 2007 VLVnT08 – Toulon April 2008 rrrrrrrrrrrrrrrrrrrrrrbbbbb

9. Product Range • Photomultipliers • Voltage Dividers • Housings • Photon counting systems VLVnT08 – Toulon April 2008 rrrrrrrrrrrrrrrrrrrrrrbbbbb

10. Product Range • Diameter: 19mm to 200mm • Spectral Range:110nm to 900nm • Gain: 103 to >108 • Rise Time: down to <2ns • Window profile: various • Rugged • Low temperature • High temperature • Low background glass VLVnT08 – Toulon April 2008 rrrrrrrrrrrrrrrrrrrrrrbbbbb

11. Main Applications • High energy Physics • Space exploration • Oil exploration • Nuclear radiation monitoring • Bio-technology • Pollution monitoring • Scintillation spectrometry VLVnT08 – Toulon April 2008 rrrrrrrrrrrrrrrrrrrrrrbbbbb

12. Recent Developments • Ultra-low temperature photocathodes for use down to -180 C • Ultra-low background glass: ~50 times lower than standard glass • All Quartz construction: >200 times lower than standard glass • Range of standard rugged pmts VLVnT08 – Toulon April 2008 rrrrrrrrrrrrrrrrrrrrrrbbbbb

13. Recent Developments • High blue/green QE combined with low dark count • Electro-optical designs to optimise collection efficiency • Low temperature photocathodes with UV windows • Encapsulated pmts for direct immersion in liquids VLVnT08 – Toulon April 2008 rrrrrrrrrrrrrrrrrrrrrrbbbbb

14. Current and Recent Projects • BaBar DIRC Detector • 30mm diameter • QE • Water resistant glass • Large quantity • Customised base VLVnT08 – Toulon April 2008 rrrrrrrrrrrrrrrrrrrrrrbbbbb

15. Current and Recent Projects • BOREXINO • 200mm hemi-spherical • Collection Efficiency • Encapsulated for Immersion in liquid • Single electron resolution • Dark count VLVnT08 – Toulon April 2008 rrrrrrrrrrrrrrrrrrrrrrbbbbb

16. Current and Recent Projects Collection Efficiency VLVnT08 – Toulon April 2008 rrrrrrrrrrrrrrrrrrrrrrbbbbb

17. Current and Recent Projects • WARP • 78 mm domed window • Timing • Operation at LAr temperature • Single electron resolution • Dark count VLVnT08 – Toulon April 2008 rrrrrrrrrrrrrrrrrrrrrrbbbbb

18. Current and Recent Projects • DAMA • 78 mm all quartz • Collection Efficiency • Fast timing • Single electron resolution • Dark count VLVnT08 – Toulon April 2008 rrrrrrrrrrrrrrrrrrrrrrbbbbb

19. Current and Recent Projects • ICARUS • 200mm hemi-spherical • QE and collection efficiency • Operation at LAr temperature • Single electron resolution • Dark count VLVnT08 – Toulon April 2008 rrrrrrrrrrrrrrrrrrrrrrbbbbb

20. Current and Recent Projects • MAGIC • 25 mm & 38 mm hemi-spherical • QE and collection efficiency • Fast timing • Single electron resolution • Low gain VLVnT08 – Toulon April 2008 rrrrrrrrrrrrrrrrrrrrrrbbbbb

21. Summary of Capability • Difficult environments • High QE/Low background • Range of window profiles • Single photon electron resolution • Customisation and Application support VLVnT08 – Toulon April 2008 rrrrrrrrrrrrrrrrrrrrrrbbbbb