Whale, Mark and Candotti, Massimo and Trappe, Neil and Murphy, J.Anthony and Baryshev, A. and Belitsky, V. (2008) Analysis of two ALMA front end receiver channels using physical optics. Proceedings of SPIE, 6893 (68930D). ISSN 0277-786X

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Abstract

The Atacama Large Millimetre Array will be a single research instrument composed of up to 50 high precision antennas, located at the Chajnantor plain in the district of San Pedro de Atacama, 5000m above sea level. Each ALMA telescope will contain 10 frequency channels/bands, ranging from 30 to 950GHz. Radiation from the secondary reflector is collected to the receivers of each wavelength channel through their accompanying front end optics. We present a full electromagnetic treatment of the front end optics for band 5 (163 - 211 GHz) and band 9 (602 - 720 GHz). A full quasi optical and physical optics analysis of the band 5 front end optics, using the antenna analysis tool, GRASP9 [1] is presented. Potential optimisation for the system is presented, namely a reflector edge taper and a comparison of two surface geometries. A similar analysis of the band 9 system is presented. Full electromagnetic simulations are compared with cold beam pattern measurements made at the Space Research Organisation of the Netherlands [2, 3]. Analysis of the effect of the polarizing grid is presented, with suggested modifications to improve cross polar levels.

Item Type:	Article
Additional Information:	Cite as: Mark Whale, Massimo Candotti, Neil Trappe, Anthony Murphy, Andrey Baryshev, and Victor Belitsky "Analysis of two ALMA front end receiver channels using physical optics", Proc. SPIE 6893, Terahertz Technology and Applications, 68930D (14 February 2008); https://doi.org/10.1117/12.762749
Keywords:	ALMA; Band 5; Band 9; Quasioptical Analysis & Verification; GRASP9;
Academic Unit:	Faculty of Science and Engineering > Experimental Physics
Item ID:	13938
Identification Number:	https://doi.org/10.1117/12.762749
Depositing User:	Dr. Neil Trappe
Date Deposited:	04 Feb 2021 14:24
Journal or Publication Title:	Proceedings of SPIE
Publisher:	SPIE
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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