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Proceedings Paper

ALMA front-end verification using dry cold load
Author(s): Yoonjae Lee; Brian Ellison; Peter Huggard; Mark Harman; Abdelhakim Boughriet; Wojciech Bartynowski; Matthew Oldfield; Nigel Morris; Peter Hekman; Gie Han Tan
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Paper Abstract

We describe the design and characterisation of a cryogenic millimetre/sub-millimetre wave calibration load, cooled by use of a closed cycle refrigerator that is used to test the performance of the ALMA receiver front-end system. Use of the refrigerator removes the need for liquid cryogen (nitrogen) cooling and allows for long duration, and unattended operation independent of orientation angle. Key requirements of the load include provision of a well-characterised and constant brightness temperature over a wide frequency range (from ~100 GHz to ~1 THz) polarisation insensitivity, high emissivity and mechanical stability. Test and verification of the load performance characteristics is achieved by using several measurement techniques; these are presented and compared with measurements made using a liquid cryogen load (cooled reference).

Paper Details

Date Published: 15 July 2010
PDF: 10 pages
Proc. SPIE 7741, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V, 77412K (15 July 2010); doi: 10.1117/12.857302
Show Author Affiliations
Yoonjae Lee, Rutherford Appleton Lab. (United Kingdom)
Brian Ellison, Rutherford Appleton Lab. (United Kingdom)
Peter Huggard, Rutherford Appleton Lab. (United Kingdom)
Mark Harman, Rutherford Appleton Lab. (United Kingdom)
Abdelhakim Boughriet, Rutherford Appleton Lab. (United Kingdom)
Wojciech Bartynowski, Rutherford Appleton Lab. (United Kingdom)
Matthew Oldfield, Rutherford Appleton Lab. (United Kingdom)
Nigel Morris, Rutherford Appleton Lab. (United Kingdom)
Peter Hekman, European Organisation for Astronomical Research in the Southern Hemisphere (United Kingdom)
Gie Han Tan, Rutherford Appleton Lab. (United Kingdom)

Published in SPIE Proceedings Vol. 7741:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V
Wayne S. Holland; Jonas Zmuidzinas, Editor(s)

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