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C ompact Stirling cooling of astronomical detectors

C ompact Stirling cooling of astronomical detectors. Gert Raskin , Johan Morren , Wim Pessemier , Jeroen Vandersteen , Jesus Perez Padilla Institute of Astronomy, KU Leuven University , Belgium Mercator Telescope , La Palma, Spain. MAIA: Mercator Advanced Imager for Asteroseismology

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C ompact Stirling cooling of astronomical detectors

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  1. Compact Stirling cooling of astronomical detectors Gert Raskin, Johan Morren, WimPessemier, JeroenVandersteen, Jesus Perez PadillaInstitute of Astronomy, KU Leuven University, BelgiumMercator Telescope, La Palma, Spain • MAIA: Mercator Advanced Imager for Asteroseismology • 3-Channel imager: U G R bands • 3 2kx6k FT CCDs (CCD42-C0, e2v) • CCDs cooled to 165K by free-piston Stirling coolers: + + : Compact, low power, simple to use, (long lifetime) – – : Vibrations (linear cooling engine at 60 Hz) Mercator Telescope Institute of Astronomy MAIA FoV: 9.4’ x 14.1’ 400 – 550 nm G camera 575 – 700 nmR camera Collimator Guiding camera λ > 875 nm U camera330 – 400 nm

  2. Compact Stirling cooling of astronomical detectors Gert Raskin, Johan Morren, WimPessemier, JeroenVandersteen, Jesus Perez PadillaInstitute of Astronomy, KU Leuven University, BelgiumMercator Telescope, La Palma, Spain Vibrations: < 10 arcsecPtP • MAIA: Mercator Advanced Imager for Asteroseismology • 3-Channel imager: U G R bands • 3 2kx6k FT CCDs (CCD42-C0, e2v) • CCDs cooled to 165K by free-piston Stirling coolers: + + : Compact, low power, simple to use, (long lifetime) – – : Vibrations (linear cooling engine at 60 Hz) 5W lift @ 77K with80W input power 243 mm total length2.2 kg total mass CryoTel MT cooler Mercator Telescope Institute of Astronomy MAIA FoV: 9.4’ x 14.1’

  3. Poster R14 Filter out cryo-cooler vibrations • Stirling cooler mounted on 4 leaf springs • No damping • Spring-mass system: mechanical low-passfilter (10 Hz) • 60 Hz + harmonics strongly attenuated • Vibration reduction: ÷ 500 @ 60 Hz • Coolers have no longer any effect on image quality Mercator Telescope Institute of Astronomy

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