Performances of the cryogenic system of GIANO-TNG

I. Mochi; E. Oliva; L. Origlia; C. Baffa; V. Biliotti; G. Falcini; E. Giani; M. Gonzalez; E. Rossetti; M. Sozzi; M. Liffredo; G. Roveta; L. Roccia

doi:10.1117/12.788241

11 July 2008 Performances of the cryogenic system of GIANO-TNG

I. Mochi, E. Oliva, L. Origlia, C. Baffa, V. Biliotti, G. Falcini, E. Giani, M. Gonzalez, E. Rossetti, M. Sozzi, M. Liffredo, G. Roveta, L. Roccia

Author Affiliations +

Proceedings Volume 7014, Ground-based and Airborne Instrumentation for Astronomy II; 70143U (2008) https://doi.org/10.1117/12.788241
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

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, E. Oliva, L. Origlia, C. Baffa, V. Biliotti, G. Falcini, E. Giani, M. Gonzalez, E. Rossetti, M. Sozzi, M. Liffredo, G. Roveta, and 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); https://doi.org/10.1117/12.788241

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