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Multi-mode horn design and beam characteristics for the Planck satellite

Murphy, J. A. and Peacocke, T. and Maffei, B. and McAuley, I. and Noviello, F. and Yurchenko, V. and Ade, P. A. R. and Savini, G. and Lamarre, J.-M. and Brossard, J. and Colgan, R. and Gleeson, E. and Lange, A. E. and Longval, Y. and Pisano, G. and Puget, J.-L. and Ristorcelli, I. and Sudiwala, R. and Wylde, R. J. (2010) Multi-mode horn design and beam characteristics for the Planck satellite. Journal of Instrumentation, 2010 (5). Art. No. T04001. ISSN 1748-0221.

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The ESA Planck satellite has begun studying the anisotropies of the cosmic microwave background radiation over the whole sky with unprecedented sensitivity and high angular resolution. The High Frequency Instrument, HFI, on Planck is observing simultaneously in six bands in the range 100 GHz to 857 GHz. The inclusion of non-CMB bands allows for robust removal of foreground sources from the data. This paper is concerned with the design, modeling and predicted performances of the two highest frequency channels centered on 545 GHz and 857 GHz, which use specialized multi-mode feedhorns, and are dedicated to observing these foregrounds. Multi-mode systems have the advantage of increasing the throughput, and thus sensitivity, of the detection assembly when diffraction limited resolution is not required. The horns are configured in a back-to-back setup which transmits the signal through filters to a detector horn. The modeling of the broadband beam patterns on the sky is shown to require careful analysis. Simulations of the complex interactions of the horns is computationally challenging when the detector horn in the relay system is included. The paper describes the approach to modeling these high frequency channels and discusses how the optical requirements on the horn designs are met in terms of spillover, edge taper, illumination of the telescope aperture and beam patterns on the sky.

Item Type:Article
Related URLs:
Ade, P. A. R.0000-0002-5127-0401
Additional Information:© 2010 IOP Publishing Ltd and SISSA. Received 15 January 2010, accepted for publication 4 March 2010. Published 15 April 2010. The authors would like to acknowledge the support from STFC, CNRS, CNES, NASA, Enterprise Ireland and Science Foundation Ireland. The authors extend their gratitude to numerous engineers and scientists who have contributed to the design, development, construction or evaluation of HFI.
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Enterprise IrelandUNSPECIFIED
Science Foundation IrelandUNSPECIFIED
Subject Keywords:Microwave Antennas; Space instrumentation; Optics; Waveguides
Issue or Number:5
Classification Code:PACS: 98.70.Vc; 07.57.Kp; 95.55.Rg
Record Number:CaltechAUTHORS:20100823-110507505
Persistent URL:
Official Citation:J A Murphy et al 2010 JINST 5 T04001 doi: 10.1088/1748-0221/5/04/T04001
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19589
Deposited By: Tony Diaz
Deposited On:23 Aug 2010 19:58
Last Modified:09 Mar 2020 13:18

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