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Proceedings Paper

ALMA front-end optics
Author(s): Matthew C. Carter; Andrey Baryshev; Mark Harman; Bernard Lazareff; James Lamb; Santiago Navarro; Dave John; A.-L. Fontana; Geoffrey Ediss; Choy Yoong Tham; Stafford Withington; Felix Tercero; Renzo Nesti; Gie-Han Tan; Yutaro Sekimoto; Mayumi Matsunaga; Higawo Ogawa; Stephane Claude
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Paper Abstract

The ALMA telescope will be an interferometer of 64 antennas, which will be situated in the Atacama desert in Chile. Each antenna will have receivers that cover the frequencies 30 GHz to 970 GHZ. This frequency range is divided into 10 frequency bands. All of these receiver bands are fitted on a cartridge and cooled, with bands 1 and 2 at 15K and the other 8 are SIS receivers at a temperature of 4K. Each band has a dual polarization receiver. The optics has been designed so that the maximum of the optics is cooled to minimize the noise temperature increase to the receivers. The design of the optics will be shown for each frequency bands. Test results with the method of testing on a near field amplitude and phase measurement system will be given for the first 4 frequency bands to be used, which are bands 3 (84-116 GHz), 6 (211-275GHz), 7 (275-375 GHz and 9 (600-702 GHz). These measurements will be compared with physical optics calculations.

Paper Details

Date Published: 28 September 2004
PDF: 11 pages
Proc. SPIE 5489, Ground-based Telescopes, (28 September 2004); doi: 10.1117/12.552538
Show Author Affiliations
Matthew C. Carter, Institut de Radioastronomie Millimetrique (France)
Andrey Baryshev, SRON/Univ. of Groningen (Netherlands)
Mark Harman, Rutherford Appleton Lab. (United Kingdom)
Bernard Lazareff, Institut de Radioastronomie Millimetrique (France)
James Lamb, Owens Valley Radio Telescope (United States)
Santiago Navarro, Instituto de Radioastronomia Milimetrica, CNRS (Spain)
Dave John, Instituto de Radioastronomia Milimetrica, CNRS (Spain)
A.-L. Fontana, Institut de Radioastronomie Millimetrique (France)
Geoffrey Ediss, National Radio Astronomy Observatory (United States)
Choy Yoong Tham, Univ. of Cambridge (United Kingdom)
Stafford Withington, Univ. of Cambridge (United Kingdom)
Felix Tercero, Yebes Observatory (Spain)
Renzo Nesti, INAF, Osservatorio Astrofisico di Arceti (Italy)
Gie-Han Tan, European Southern Observatory (Germany)
Yutaro Sekimoto, Nobeyama Radio Observatory (Japan)
Mayumi Matsunaga, Nobeyama Radio Observatory (Japan)
Higawo Ogawa, Nobeyama Radio Observatory (Japan)
Stephane Claude, Herzberg Institute of Astrophysics (Canada)


Published in SPIE Proceedings Vol. 5489:
Ground-based Telescopes
Jacobus M. Oschmann, Editor(s)

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