Publications by Jaya John John


The C-Band all-sky survey (C-BASS): Design and implementation of the Northern receiver

Monthly Notices of the Royal Astronomical Society 438 (2014) 2426-2439

OG King, ME Jones, EJ Blackhurst, C Copley, RJ Davis, C Dickinson, CM Holler, MO Irfan, JJ John, JP Leahy, J Leech, SJC Muchovej, TJ Pearson, MA Stevenson, AC Taylor

The C-Band All-Sky Survey 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 broad-band singlefrequency 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 ≈30K 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, similar to the telescope azimuthal scan frequency. © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.


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