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L. Gambicorti (a) , V. Bratina (b)(c) , P. Mazzinghi (b)(c) , E. Pace (a)(c)

Filter lenses as optical adapters for R8900. L. Gambicorti (a) , V. Bratina (b)(c) , P. Mazzinghi (b)(c) , E. Pace (a)(c) (a) XUVLab, Dipartimento Astronomia e Scienza dello Spazio, Università di Firenze, Firenze (Italy) (b) Istituto Nazionale di Ottica Applicata, Firenze (Italy)

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L. Gambicorti (a) , V. Bratina (b)(c) , P. Mazzinghi (b)(c) , E. Pace (a)(c)

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  1. Filter lenses as optical adapters for R8900 L. Gambicorti(a), V. Bratina(b)(c), P. Mazzinghi(b)(c), E. Pace(a)(c) (a) XUVLab, Dipartimento Astronomia e Scienza dello Spazio, Università di Firenze, Firenze (Italy) (b) Istituto Nazionale di Ottica Applicata, Firenze (Italy) (c) INFN, Sezione di Firenze, Firenze (Italy) EUSO IWG Meeting - Palermo 3-5 February 2003

  2. Why optical adapters? The aim is to develop optical adapters for the R8900 MAPMT in order to • Improve the collection efficiency (> 79%) • Include the UV filter without reducing collection efficiency • Keep the total mass below the spec (25 kg) • Keep imaging capabilities EUSO IWG Meeting - Palermo 3-5 February 2003

  3. MAPMT window Filter lens Mirror Filter lens EUSO IWG Meeting - Palermo 3-5 February 2003

  4. Filter lens EUSO IWG Meeting - Palermo 3-5 February 2003

  5. Glue + UV glass Filter Lens PMT Detector assembly EUSO IWG Meeting - Palermo 3-5 February 2003

  6. Lens features & problems Measured: 1 mm thick glass Blue leak EUSO IWG Meeting - Palermo 3-5 February 2003

  7. MgF2/HfO2 + AR coating SiO2/HfO2 + AR coating Dieletric multilayers Blu: BG24 Red: BG1 Black: BG3 EUSO IWG Meeting - Palermo 3-5 February 2003

  8. Comparison MgF2/HfO2 SiO2/HfO2 EUSO IWG Meeting - Palermo 3-5 February 2003

  9. Interference filter EUSO IWG Meeting - Palermo 3-5 February 2003

  10. Wavelength shift α =0° MgF2/HfO2 + AR coating α =30° SiO2/HfO2 + AR coating EUSO IWG Meeting - Palermo 3-5 February 2003

  11. PMMA lens 27 mm Window MAPMT mirror BG3 filter Enhanced filter lens Thickness of BG3 is 1 mm EUSO IWG Meeting - Palermo 3-5 February 2003

  12. Track simulation EUSO IWG Meeting - Palermo 3-5 February 2003

  13. Conclusions • We have obtained an almost constant high efficiency in the range 300-400 nm, including the absorption of the UV filter: 95 of 100 photons impinging on the FS are collected • This filter lens can be coupled to the R8900 only. The performance of R8900+filter lens (95%) is much better than R7600+collectors (75%) • The blue-leak problem of BG3 has been solved using multilayer coatings • The total mass is well within the spec’s • The filter lens are feasible at low risk (Galileo Avionica, LAV coatings) EUSO IWG Meeting - Palermo 3-5 February 2003

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