The quasi-optical design of the QUaD Telescope

Gary Cahill; Creidhe O'Sullivan; J. Anthony Murphy; William Lanigan; Emily Gleeson; Peter A. R. Ade; James J. Bock; Melanie Bowden; John E. Carlstrom; Sarah E. Church; Ken Ganga; Walter Gear; John Harris; James Hinderks; Wayne Hu; John Kovac; Andrew Lange; Erik M. Leitch; Bruno Maffei; Olivier Mallie; Simon Melhuish; Angiola Orlando; Giampaolo Pisano; Lucio Piccirillo; Clem Pryke; Ben Rusholme; Andy Taylor; Keith L. Thompson; Michael Zemcov

doi:10.1117/12.551680

8 October 2004 The quasi-optical design of the QUaD Telescope

Gary Cahill, Creidhe O'Sullivan, J. Anthony Murphy, William Lanigan, Emily Gleeson, Peter A. R. Ade, James J. Bock, Melanie Bowden, John E. Carlstrom, Sarah E. Church, Ken Ganga, Walter Gear, John Harris, James Hinderks, Wayne Hu, John Kovac, Andrew Lange, Erik M. Leitch, Bruno Maffei, Olivier Mallie, Simon Melhuish, Angiola Orlando, Giampaolo Pisano, Lucio Piccirillo, Clem Pryke, Ben Rusholme, Andy Taylor, Keith L. Thompson, Michael Zemcov

Author Affiliations +

Proceedings Volume 5498, Millimeter and Submillimeter Detectors for Astronomy II; (2004) https://doi.org/10.1117/12.551680
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

QUaD is a ground-based high-resolution (up to l ≈ 2500) instrument designed to map the polarisation of the Cosmic Microwave Background and to measure its E-mode and B-mode polarisation power spectra. QUaD comprises a bolometric array receiver (100 and 150 GHz) and re-imaging optics on a 2.6-m Cassegrain telescope 2. It will operate for two years and begin observations in 2005. CMB polarisation measurements will require not only a significant increase in sensitivity over earlier experiments but also a better understanding and control of systematic effects particularly those that contribute to the polarised signal. To this end we have undertaken a comprehensive quasi-optical analysis of the QUaD telescope. In particular we have modelled the effects of diffraction on beam propagation through the system. The corrugated feeds that couple radiation from the telescope to phase-sensitive bolometers need to have good beam symmetry and low sidelobe levels over the required bandwidth. It is especially important that the feed horns preserve the polarisation orientation of the incoming fields. We have used an accurate mode-matching model to design such feed horns. In this paper we present the diffraction analysis of the QUaD front-end optics as well as the electromagnetic design and testing of the QUaD corrugated feeds.

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Gary Cahill, Creidhe O'Sullivan, J. Anthony Murphy, William Lanigan, Emily Gleeson, Peter A. R. Ade, James J. Bock, Melanie Bowden, John E. Carlstrom, Sarah E. Church, Ken Ganga, Walter Gear, John Harris, James Hinderks, Wayne Hu, John Kovac, Andrew Lange, Erik M. Leitch, Bruno Maffei, Olivier Mallie, Simon Melhuish, Angiola Orlando, Giampaolo Pisano, Lucio Piccirillo, Clem Pryke, Ben Rusholme, Andy Taylor, Keith L. Thompson, and Michael Zemcov "The quasi-optical design of the QUaD Telescope", Proc. SPIE 5498, Millimeter and Submillimeter Detectors for Astronomy II, (8 October 2004); https://doi.org/10.1117/12.551680

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