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R&D for metal mirrors

R&D for metal mirrors. Masaki Mori ICRR, Univ. Tokyo. In collaboration with: Akiko Kawachi (Tokai), Midori Yuasa, Michiko Ohishi (ICRR). CTA meeting, Berlin, May 4-5, 2006. Mirror materials. A. Kawachi et al., Astropart. Phys. 14, 261 (2001). CANGAROO-II/III plastic mirror.

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R&D for metal mirrors

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  1. R&D for metal mirrors Masaki Mori ICRR, Univ. Tokyo In collaboration with: Akiko Kawachi (Tokai), Midori Yuasa, Michiko Ohishi (ICRR) CTA meeting, Berlin, May 4-5, 2006

  2. Mirror materials

  3. A. Kawachi et al., Astropart. Phys. 14, 261 (2001) CANGAROO-II/III plastic mirror Light (~6kg), durable, but… T2 T1

  4. Sample aluminium mirror Without coating With SiO coating With Al+SiO coating Just machine-ground (no polishing) !

  5. Reflectivity Cf. Literature

  6. Surface measurement

  7. 3D measurement

  8. Focus Image size in X-axis Image size in Y-axis

  9. Image Integrated CCD counts 89% within 0.1 degree

  10. Weathering Reflectivity of a sample mirror before and after exposure in Woomera

  11. Summary • We are developing aluminium mirrors by simple manufacturing process. • Samples show modest quality (89% light within 0.1 degree). • Weathering tests are going on. • Anti-dew mechanisms should be developed. • In real use we may form a segment from multiple mirrors to save the number of tuning mechanism.

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