caa a22 4500 445366281 CHVBK 20180317142931.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10909-010-0263-7 doi (NATIONALLICENCE)springer-10.1007/s10909-010-0263-7 On the Efficiency of Infrared Filters in Optical Cryostats [Elektronische Daten] [M. Melich, R. Boltnev, F. Bonnet, L. Guyon, P. Wolf] In an optical cryostat, the sample temperature is limited by the 300K thermal radiation transmitted through the observation windows. As discussed in this paper, the corresponding heat load should be brought much below the μW level by using suitable cold IR filters. However, there are situations where one wants to directly check the absence of IR heating by running the same experiment with the cold observation windows either open or totally blocked. We describe a particular example which is the study of helium condensation in a silica aerogel. On this aim, we developed a simple and compact magnetic system able to move metallic shutters inside our optical cryostat. This allows us to set an upper bound of 1μW for the effect of 300K thermal radiation on our sample. We discuss the relevance of this result to the operation of optical dilution refrigerators. Springer Science+Business Media, LLC, 2010 Aerogels nationallicence Optical cryostat nationallicence Thermal radiation nationallicence Infrared filters nationallicence Low temperature shutters nationallicence Melich M. Institut Néel CNRS-UJF, BP 166, 38042, Grenoble Cédex 9, France aut Boltnev R. Institute of Energy Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, 142432, Moscow region, Russia aut Bonnet F. Institut Néel CNRS-UJF, BP 166, 38042, Grenoble Cédex 9, France aut Guyon L. Institut Néel CNRS-UJF, BP 166, 38042, Grenoble Cédex 9, France aut Wolf P. Institut Néel CNRS-UJF, BP 166, 38042, Grenoble Cédex 9, France aut Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 740-747 0022-2291 162:5-6<740 2011 162 10909 https://doi.org/10.1007/s10909-010-0263-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10909-010-0263-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Melich M. Institut Néel CNRS-UJF, BP 166, 38042, Grenoble Cédex 9, France aut NATIONALLICENCE 700 1- Boltnev R. Institute of Energy Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, 142432, Moscow region, Russia aut NATIONALLICENCE 700 1- Bonnet F. Institut Néel CNRS-UJF, BP 166, 38042, Grenoble Cédex 9, France aut NATIONALLICENCE 700 1- Guyon L. Institut Néel CNRS-UJF, BP 166, 38042, Grenoble Cédex 9, France aut NATIONALLICENCE 700 1- Wolf P. Institut Néel CNRS-UJF, BP 166, 38042, Grenoble Cédex 9, France aut NATIONALLICENCE 773 0- Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 740-747 0022-2291 162:5-6<740 2011 162 10909 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer