title: Total power millimeter-wave spectrometer for measurements of dust opacity at cryogenic temperatures.
abstract: A highly sensitive total power millimeter-wave spectrometer has been built to investigate the opacity of important interstellar-dust analogues in the 10-300 K temperature range. The key elements of the spectrometer are a frequency agile synthesizer followed by a microwave amplifier and a subsequent frequency multiplier. In a first step, the frequency range of 72-120 GHz is covered by the spectrometer, and a room temperature Schottky detector is employed as a detector. A newly developed two channel (sample/reference) copper sample holder is cryogenically cooled for the 10-300 K range. Here we present the technical details of the spectrometer including examples of the obtained results. The analysis of these results will be published elsewhere.
authors.affiliation: I. Physikalisches Institut, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany.
authors.forename: Alexey
authors.initials: A
authors.lastname: Potapov
authors.affiliation: I. Physikalisches Institut, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Lewen
authors.affiliation: Astrophysical Institute and University Observatory, Friedrich-Schiller-University Jena, Schillergaesschen 3, 07745 Jena, Germany.
authors.forename: Harald
authors.initials: H
authors.lastname: Mutschke
authors.affiliation: Astrophysical Institute and University Observatory, Friedrich-Schiller-University Jena, Schillergaesschen 3, 07745 Jena, Germany.
authors.forename: Pierre
authors.initials: P
authors.lastname: Mohr
authors.affiliation: I. Physikalisches Institut, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany.
authors.forename: Stephan
authors.initials: S
authors.lastname: Schlemmer