1. Andy Cormack Sensor Development Director Graham Sperrin European Sales Manager ET Enterprises Limited 45 Riverside Way Uxbridge UB8 2YF United Kingdom Tel:+44 (0)1895 200880 Fax: +44 (0)1895 270873 web: http://www.et-enterprises.com e-mail: info@et-enterprises.com ADIT Electron Tubes 300 Crane Street Sweetwater Texas 79556 USA Tel:(+1) 325 235 1418 Toll Free: (+1) 800 521 8382 Fax: (+1) 325 235 2872 e-mail sales@electrontubes.com VLVnT11 – 12Oct2011 ET Enterprises Ltd

2. ETEL (UK) ADIT Ludlum Measurements Inc Sweetwater, Texas Background on the Ludlum Group ELJEN VLVnT11 – 12Oct2011

3. Ludlum Company Overview In Business since 1962 Almost 500 Employees Engineering Excellence Sweetwater, Texas Vertical Manufacturing Committed to: Reliability Reliability Durability Durability Affordability Affordability Don Ludlum – Founder & President

4. ADIT Back Photomultiplier Tubes for Radiation Detection Product Lines Photomultiplier Tubes Sockets Bases Voltage Dividers Markets Served Industry Scientific Community www.aditpmt.com Sweetwater, Texas

5. Eljen Technology Back Organic Scintillators Product Lines Plastic Scintillators Liquid Scintillators PMMA & UVT Material Loaded Scintillators Paints Neutron Detectors Wave Shifting Plastics Zinc Sulfide Shifting Plastics Optical Cement, Greases, Adhesives etc. Markets Served Industry Research www.eljentechnology.com Sweetwater, Texas

6. Photomultiplier manufacturing ET Enterprises, UK Pmts for specialist applications 19 mm to 225 mm diameter QE to 30% Low dark noise for photon counting High SER p/v ADIT, US Pmts for industrial applications 13 mm to 135 mm diameter Plastic, inorganic, and photon counting Flexible dual site manufacturing for high volumes VLVnT11 – 12Oct2011 Additional manufacturing facility being prepared

7. Specific requirements for the PMT design 3” (76 mm) diameter Very short length of 103.5 mm Low transit time jitter ( σ < 2 ns) High QE at 470 nm High collection efficiency Good cathode uniformity High gain capability (single photoelectron detection) High gain for low operating voltage Low dark noise PMT requirements for KM3NeT VLVnT11 – 12Oct2011

8. Simulated time response Full 3D simulation OverallSigma k-d123.40.8 k-d229.51.6 k-d331.61.8 Electron optical simulation VLVnT11 – 12Oct2011

9. D783FL typical performance Typical QE at 470 nm 22% VLVnT11 – 12Oct2011

10. D783FL typical performance Single photoelectron responseSingle photoelectron timing VLVnT11 – 12Oct2011

11. D783FL typical performance Single photoelectron jitter less than 2 ns sigma VLVnT11 – 12Oct2011

12. Large diameter pmt range VLVnT11 – 12Oct2011 Parameter93729350935293549357D784 Diameter (in)5888811 No. of stages614612 Typical operating gain10^710^810^410^7 Typical QE% at peak2830 1830 Surface area (cm 2 )160425 800 Typical dark cps at 20C15004000- 8000 Typical SER ratio1.5 -222 Typical 1e TTJ fwhm(ns)2.78- 3 Minimum Temperature-30C -196C-30C Weight (grams)380700 2000

13. VLVnT11 – 12Oct2011 Large diameter hemispherical pmts Design specifications: External water pressure of 11 bar Long life in pure water Glass with low content of radioactive isotopes Design for good photoelectron collection Design for good timing (TTJ)

14. VLVnT11 – 12Oct2011 Electron optical modelling Launch distance  to tube axis (mm) k-d1 transit time (ns) 036.1 1236.1 2436.0 3636.0 4835.9 6035.7 7135.7 8335.4 9535.2 10735.2 11935.6 13734.9

15. VLVnT11 – 12Oct2011 Mechanical stress analysis – Mk1 design

16. VLVnT11 – 12Oct2011 Mechanical stress analysis – Mk2 design

17. VLVnT11 – 12Oct2011 Expected gamma decay rate – Mk4 Glass Activity Glass thicknessExpected mass (g) Gamma rate (Bq)* (60ppm K, 30ppb Th, 30ppb U) Maximum2,2183.2 ± 1.7 Minimum1,4822.2 ± 1.1 *Estimated Gamma emission > 0.1 MeV UL BGD glassConcentration Natural potassium60 ppm Thorium30 ppb Uranium30 ppb

18. Thank you