The quasi-optical design of the QUaD telescope

C. O'Sullivan*, G. Cahill, J. A. Murphy, W. K. Gear, J. Harris, P. A.R. Ade, S. E. Church, K. L. Thompson, C. Pryke, J. Bock, M. Bowden, M. L. Brown, J. E. Carlstrom, P. G. Castro, T. Culverhouse, R. B. Friedman, K. M. Ganga, V. Haynes, J. R. Hinderks, J. KovakA. E. Lange, E. M. Leitch, O. E. Mallie, S. J. Melhuish, A. Orlando, L. Piccirillo, G. Pisano, N. Rajguru, B. A. Rusholme, R. Schwarz, A. N. Taylor, E. Y.S. Wu, M. Zemcov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We describe the optical design and performance of 'QUEST and DASI' or 'QUaD', a ground-based high-resolution experiment designed to measure the polarisation properties of the cosmic microwave background radiation. QUaD uses bolometric detectors at 100 and 150 GHz on a 2.6 m Cassegrain telescope. The QUaD optics are designed to minimise systematic effects as well as to maximise sensitivity, and we report here on the comprehensive quasi-optical analysis used to achieve this design. We also present initial optical performance measurements achieved in operation, and discuss changes made to the optics to overcome some errors in the mechanical construction of the primary mirror. The QUaD experiment is now fully operational and taking world-leading data at the South Pole.

Original languageEnglish
Pages (from-to)277-286
Number of pages10
JournalInfrared Physics and Technology
Volume51
Issue number4
Early online date27 Oct 2007
DOIs
Publication statusPublished - 1 Mar 2008

Keywords / Materials (for Non-textual outputs)

  • Cosmic microwave background
  • Feedhorn design
  • Gaussian beam modes
  • Optical design
  • Quasioptics

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