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WSPEC: A Waveguide Filter-Bank Focal Plane Array Spectrometer for Millimeter Wave Astronomy and Cosmology

Bryan, Sean, Aguirre, James, Che, George, Doyle, Simon, Flanigan, Daniel, Groppi, Christopher, Johnson, Bradley, Jones, Glenn, Mauskopf, Philip, McCarrick, Heather, Monfardini, Alessandro and Mroczkowski, Tony 2016. WSPEC: A Waveguide Filter-Bank Focal Plane Array Spectrometer for Millimeter Wave Astronomy and Cosmology. Journal of Low Temperature Physics 184 (1-2) , pp. 114-122. 10.1007/s10909-015-1396-5

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Abstract

Imaging and spectroscopy at (sub-)millimeter wavelengths are key frontiers in astronomy and cosmology. Large area spectral surveys with moderate spectral resolution (R=50R=50–200) will be used to characterize large-scale structure and star formation through intensity mapping surveys in emission lines such as the CO rotational transitions. Such surveys will also be used to study the the Sunyaev Zeldovich (SZ) effect, and will detect the emission lines and continuum spectrum of individual objects. WSPEC is an instrument proposed to target these science goals. It is a channelizing spectrometer realized in rectangular waveguide, fabricated using conventional high-precision metal machining. Each spectrometer is coupled to free space with a machined feed horn, and the devices are tiled into a 2D array to fill the focal plane of the telescope. The detectors will be aluminum lumped-element kinetic inductance detectors (LEKIDs). To target the CO lines and SZ effect, we will have bands at 135–175 and 190–250 GHz, each Nyquist-sampled at R≈200R≈200 resolution. Here, we discuss the instrument concept and design, and successful initial testing of a WR10 (i.e., 90 GHz) prototype spectrometer. We recently tested a WR5 (180 GHz) prototype to verify that the concept works at higher frequencies, and also designed a resonant backshort structure that may further increase the optical efficiency. We are making progress towards integrating a spectrometer with a LEKID array and deploying a prototype device to a telescope for first light.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Springer
ISSN: 00222291
Date of First Compliant Deposit: 7 September 2017
Date of Acceptance: 25 November 2015
Last Modified: 03 Jan 2018 13:27
URI: http://orca-mwe.cf.ac.uk/id/eprint/104446

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