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Euso-balloon Lenses

Euso-balloon Lenses. Design: - Alex Zuccaro (now at ESTEC) - Yoshiyuki Takizawa (Takky): RIKEN Production: - Takky (RIKEN) - H. Ohmori (IKEGAMI & RIKEN) Measure of instrument focal length - Massimiliano Bonamente (Max): UAH Huntsville, Alabama Integration - Peter Von Ballmoos: IRAP

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Euso-balloon Lenses

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  1. Euso-balloon Lenses • Design: • - Alex Zuccaro (now at ESTEC) • - Yoshiyuki Takizawa (Takky): RIKEN • Production: • - Takky (RIKEN) • - H. Ohmori (IKEGAMI & RIKEN) • Measure of instrument focal length • - Massimiliano Bonamente (Max): UAH Huntsville, Alabama • Integration • - Peter Von Ballmoos: IRAP • French representative: myself, on behalf of the Jem-Euso collaboration End of phase A meeting CNES (Toulouse) 2/02/2012 Ph. Gorodetzky APC - Paris Diderot

  2. Lenses Euso-balloon lenses JEM-EUSO (hence Euso-balloon) is a telescope made with lenses. • Why lenses instead of a mirror which is lighter? Because of ISS (and balloon) movements! • Why Fresnel: because of weight! • Tools used: Code V (and a faster ray-tracing program written by Yoshiyuki Takizawa (Takky)) and a TOSHIBA lathe UTD-3400 at IKEGAMI factory. End of phase A meeting CNES (Toulouse) 2/02/2012 Ph. Gorodetzky APC - Paris Diderot End of phase A meeting CNES (Toulouse) 2/02/2012 Ph. Gorodetzky APC - Paris Diderot 2

  3. Balloon lenses • 3 one sided lenses • square flat 1 x 1 m • 2 classical • 1 diffractive • both made of Shinkolite L PMMA-000 Radius of curvature of FS: 509 mm (implies the flat ECs will be at 5.6° one from each other) This is the result of a compromise between the smallest FOV required to recognize a shower and the angle of the rays on the FS End of phase A meeting CNES (Toulouse) 2/02/2012 Ph. Gorodetzky APC - Paris Diderot

  4. Spot sizes One MAPMT pixel is 2.88 x 2.88mm  stability of response End of phase A meeting CNES (Toulouse) 2/02/2012 Ph. Gorodetzky APC - Paris Diderot

  5. Positionning Optics Tolerances (RMS spot sizes change ±10%) No problem for the lenses, but the PDM must be on an axial manual movement Important difference between normal and Fresnel lens: It is easy to predict the focal length for a normal lens It is impossible to manufacture precisely a Fresnel lens with a predicted focal length: the total focal length could be ± 10 cm! So it is necessary to measure the true focal length of the system with a large parallel beam of the good wavelength (290 – 430 nm), measuring the PSF with fine granularity detector (CCD). This equipment is ready for us at UAH (Huntsville, Alabama) End of phase A meeting CNES (Toulouse) 2/02/2012 Ph. Gorodetzky APC - Paris Diderot

  6. Lenses mechanics End of phase A meeting CNES (Toulouse) 2/02/2012 Ph. Gorodetzky APC - Paris Diderot

  7. Development plan • Telescope SYSTEM • The Optical Lenses system consists in three PMMA lenses each having a Fresnel shaped face side and • the other side is flat. Riken laboratory has the responsibility of the calculation of the exact shape of the lenses for EUSO BALLOON. • The PMMA material will be provided by Mitsubishi Rayon Co., LTD. • The lenses are manufactured by IKEGAMI Molt Ltd in Japan. Series of Bread Board Module has already been produced • and there is no particular difficulty in the machining. Thus the process of fabrication has already been validated. • The FM will be directly produced by this company, under RIKEN responsibility. Each manufactured lens will be checked in • acceptance test in RIKEN. The optical performances of the set of three lenses will be checked in Riken. Then the three • lenses and the optical test system will be delivered to IRAP for the final acceptance Integration and Tests. End of phase A meeting CNES (Toulouse) 2/02/2012 Ph. Gorodetzky APC - Paris Diderot

  8. Risk analysis • Management: delay in lens delivery • Failure of the facility (IKEGAMI). Recovery time is estimated at 2 months and has been measured after big earthquake. Fabrication is estimated at 2 weeks / lens. Highest priority will be given. • Technological: a lens is damaged • Material for an extra lens will be stored in RIKEN. With high priority, the damaged lens will be replaced in 4 weeks. End of phase A meeting CNES (Toulouse) 2/02/2012 Ph. Gorodetzky APC - Paris Diderot

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