Abstract
In this paper, we present the design and verification of the optics of the Swedish Heterodyne Facility Instrument (SHeFI) receiver installed in the Atacama Pathfinder EXperiment (APEX) telescope during spring 2008. SHeFI is located in the Nasmyth instrumentation Cabin A (NCA). The receiver has been designed to have 6 frequency channels, of which four receiver channels have been built, and characterized: 211-275 GHz (Band 1), 275-370 GHz (Band 2), 385-500 GHz (Band 3), and 1250-1390 GHz (Band T2). Bands 1, 2, and T2 are installed at the telescope and are currently in operation. The optical design is driven by the requirement of frequency independent illumination of the secondary with -12 dB edge taper for each frequency channel and the limitation (beam clearance through the Nasmyth tube and the elevation encoder) imposed by the receiver position in the NCA. This paper describes the design approach, optimization, and verification of the optical system, coupling each individual receiving beam to the common optics of the telescope.
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References
Official APEX Telescope web-site, http://www.apex-telescope.org
VERTEX Antennentechnik, Duisburg, Germany www.vertexant.com
V. Belitsky, et. al., “Facility Heterodyne Receiver for the Atacama PathfinderExperiment Telescope”, Proceedings of joint 32nd International Conference on Infrared Millimeter Waves and 15th International Conference on Terahertz Electronics, September 3 - 7, 2007, City Hall, Cardiff, Wales, UK, pp. 326–328
V. Vassilev, et. al., “A Swedish heterodyne facility instrument for the APEX telescope,” Astronomy and Astrophysics, 490(3), 1157-1163 (2008). doi: 10.1051/0004-6361:200810459.
V. Vassilev, et. al., “Design and Characterization of a 211-275 GHz Sideband Separating Mixer for the APEX Telescope,” IEEE Microwave and Wireless Components Letters, 18(1), 58–60, ISBN/ISSN 1531-1309
C. Risacher, et. al.,“A sideband separation SIS mixer for 275-370 GHz for the APEX telescope”, Proceedings of the SPIE “Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III”, eds. J. Zmuidzinas, W.S. Holland, S. Withington, W.D. Duncan, 6275 s. 62751 T, 2006
R. Monje, et. al., “A 385-500 GHz SIS Mixer for APEX Telescope,” Millimeter and Submillimeter Detectors for Astronomy III”, eds. J. Zmuidzinas, W.S. Holland, S. Withington, W.D. Duncan, Proceedings of SPIE, 6275 s. 19, 2006
D. Meledin, et. al. “A 1.3 THz Balanced Waveguide HEB Mixer for the APEX Telescope,” IEEE Trans. on Microwave Theory and Techniques, 57(1), 89-99 (2009). (ISSN 0018-9480).
J. Ruze, “The effect of aperture errors on the antenna radiation pattern,” Suppl. al Nuovo Cimento, 9(3), 364–380 (1952).
J. R. Pardo, J. Cernicharo, and E. Serabyn, “Atmospheric Transmission at Microwave (ATM): An Improved Model for Millimeter/Submillimeter Applications,” IEEE Trans. on Antennas and Propagation, 49(12) (2001).
Heyminck, Kasemann, Belitsky, “ICD for receivers operated in the APEX NCA”, 2004-10-01
J. W. Lamb, “ALMA Receiver Optics Design”, ALMA Memo 362, 2001-04-11
Rudolf, et. al., “The ALMA Front End Optics-System Aspects and European Measurement Results,” IEEE Trans. on Antennas and Propagation, 55(11), 2966–2973 (2007).
MICOS DT-80, M I C O S GmbH, http://www.micos.ws
T.-S. Chu, “An imaging beam waveguide feed,” IEEE Trans. on Antennas and Propagations, AP-31(4), 614–619 (1983).
J. W. Lamb, “Optical study for ALMA receivers,” ALMA Memo Series No. 359 (2001).
A. Baryshev, W. Wild, “ALMA Band 9 Optical Layout,” ALMA Memo Series, 394 (2001).
Belitsky, Olberg, Risacher, “APEX Cabin A: Instrument Optical Switch Reference Document”, 2005-03-22
Cryo cooler SRDK-3ST, Sumitomo Heavy Industries
P. J. B. Clarricoats and A. D. Olver, “Corrugated Horns for Microwave Antennas”, Peter Peregrinus, 1984
T. S. Chu, R. H. Turrin, “Depolarization Properties of Offset Reflector Antennas,” IEEE Trans. on Antennas and Propagations, AP-21(3), 339–345 (1973).
P. F. Goldsmith, Quasioptical Systems (IEEE Press, New York, 1998), ISBN 0-7803-3439-6.
Radiometer Physics GmbH, www.radiometer-physics.de
J. A. Murphy, “Distortion of Simple Gaussian beam on Reflection from Off-Axis Ellipsoidal Mirrors,” Int. Jour. of Infrared and Millimeter Waves, 8(9), 1165–1187 (1987).
J. A. Murphy, A. Egan, and S. Withington, “Truncation in Millimeter and Submillimeter-Wave Optical Systems,” IEEE Transactions on Antennas and Propagation, 40(10), 1408–1413 (1993).
V. Belitsky, I. Lapkin, R. Monje, V. Vassilev, C. Risacher, A. Pavolotsky, D. Meledin, M. Olberg, M. Pantaleev, R. Booth, “Heterodyne Single-Pixel Facility Instrumentation for APEX Telescope” Proceedings of SPIE Conference on Astronomical Telescopes and Instrumentation, Proc. of SPIE, Vol. 6275 62750G1 - 62750G1, 24 - 31 May 2006, Orlando, Florida USA
O. Nyström, M. Pantaleev, V. Vassilev, I. Lapkin, V. Belitsky, “A Vector Beam Measurement System for 211-275 GHz”, Proceedings EuCAP 2006, Nice, France, 6-10 November 2006, (ESA SP-626, October 2006).
M. Pantaleev, “Radioastronomy Instrumentation for Herschel and APEX Projects”, Ph.D. thesis, ISBN/ISSN 91-7291-806-3, Göteborg 2006
Duma Optronics LTD, www.duma.co.il.
Acknowledgment
The authors would like to thank C.–Y. E. Tong and W. Jellema for kind willingness to share their experience in beam measurements. A. Baryshev is greatly acknowledged for sharing his insight in design of frequency independent optics and for interesting discussions.
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Nyström, O., Lapkin, I., Desmaris, V. et al. Optics Design and Verification for the APEX Swedish Heterodyne Facility Instrument (SHeFI). J Infrared Milli Terahz Waves 30, 746–761 (2009). https://doi.org/10.1007/s10762-009-9493-7
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DOI: https://doi.org/10.1007/s10762-009-9493-7