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 1. 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.
|Original language||English (US)|
|Number of pages||11|
|Journal||Proceedings of SPIE - The International Society for Optical Engineering|
|State||Published - 2004|
|Event||Millimeter and Submillimeter Detectors for Astronomy II - Glasgow, United Kingdom|
Duration: Jun 23 2004 → Jun 25 2004
Bibliographical noteFunding Information:
We would like to thank NUI Maynooth and Science Foundation Ireland for supporting this work financially. The QUaD instrument is funded by the National Science Foundation (USA) and the Particle Physics and Astronomy Research Council (UK).
- Cosmic microwave background
- Feed horn design
- Gaussian beam modes
- Optical design