11 July 2008 Performances of the cryogenic system of GIANO-TNG
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Abstract
GIANO-TNG is a cryogenic high resolution infrared spectrometer whose optics include large aspheric mirrors and cross-dispersing prisms mounted over a ≃1.5 m2 aluminum bench. To achieve the highest possible spectral stability and repeatability the bench is internally filled with liquid nitrogen whose boil-off pressure is actively controlled and stabilized to a fraction of mbar. The bench is isostatically mounted inside a ≃2.5 m3 cryostat. We present the characteristics and performances of the cryogenic system of GIANO which include, in particular, a temperature uniformity and long-term stability of a few mK and a remarkably low consumption of liquid nitrogen (less than 1 liter/hr).
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I. Mochi, I. Mochi, E. Oliva, E. Oliva, L. Origlia, L. Origlia, C. Baffa, C. Baffa, V. Biliotti, V. Biliotti, G. Falcini, G. Falcini, E. Giani, E. Giani, M. Gonzalez, M. Gonzalez, E. Rossetti, E. Rossetti, M. Sozzi, M. Sozzi, M. Liffredo, M. Liffredo, G. Roveta, G. Roveta, L. Roccia, L. Roccia, "Performances of the cryogenic system of GIANO-TNG", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70143U (11 July 2008); doi: 10.1117/12.788241; https://doi.org/10.1117/12.788241
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