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18 April 2024 |
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The C-Band All-Sky Survey (C-BASS): Design and implementation of the northern receiver | | O.G. King
; Michael E. Jones
; E.J. Blackhurst
; C. Copley
; R.J. Davis
; C. Dickinson
; C.M. Holler
; M.O. Irfan
; J.J. John
; J.P. Leahy
; J. Leech
; S.J.C. Muchovej
; T.J. Pearson
; M.A. Stevenson
; Angela C. Taylor
; | | Date: |
26 Oct 2013 | | Abstract: | The C-Band All-Sky Survey (C-BASS) is a project to map the full sky in total
intensity and linear polarization at 5 GHz. The northern component of the
survey uses a broadband single-frequency analogue receiver fitted to a 6.1-m
telescope at the Owens Valley Radio Observatory in California, USA. The
receiver architecture combines a continuous-comparison radiometer and a
correlation polarimeter in a single receiver for stable simultaneous
measurement of both total intensity and linear polarization, using
custom-designed analogue receiver components. The continuous-comparison
radiometer measures the temperature difference between the sky and
temperature-stabilized cold electrical reference loads. A cryogenic front-end
is used to minimize receiver noise, with a system temperature of $approx 30$ K
in both linear polarization and total intensity. Custom cryogenic notch filters
are used to counteract man-made radio frequency interference. The radiometer
$1/f$ noise is dominated by atmospheric fluctuations, while the polarimeter
achieves a $1/f$ noise knee frequency of 10 mHz, equal to the telescope
azimuthal scan frequency. | | Source: | arXiv, 1310.7129 | | Services: | Forum | Review | PDF | Favorites | |
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