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Proceedings Paper

Canadian Hydrogen Intensity Mapping Experiment (CHIME) pathfinder
Author(s): Kevin Bandura; Graeme E. Addison; Mandana Amiri; J. Richard Bond; Duncan Campbell-Wilson; Liam Connor; Jean-François Cliche; Greg Davis; Meiling Deng; Nolan Denman; Matt Dobbs; Mateus Fandino; Kenneth Gibbs; Adam Gilbert; Mark Halpern; David Hanna; Adam D. Hincks; Gary Hinshaw; Carolin Höfer; Peter Klages; Tom L. Landecker; Kiyoshi Masui; Juan Mena Parra; Laura B. Newburgh; Ue-li Pen; Jeffrey B. Peterson; Andre Recnik; J. Richard Shaw; Kris Sigurdson; Mike Sitwell; Graeme Smecher; Rick Smegal; Keith Vanderlinde; Don Wiebe
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Paper Abstract

A pathfinder version of CHIME (the Canadian Hydrogen Intensity Mapping Experiment) is currently being commissioned at the Dominion Radio Astrophysical Observatory (DRAO) in Penticton, BC. The instrument is a hybrid cylindrical interferometer designed to measure the large scale neutral hydrogen power spectrum across the redshift range 0.8 to 2.5. The power spectrum will be used to measure the baryon acoustic oscillation (BAO) scale across this poorly probed redshift range where dark energy becomes a significant contributor to the evolution of the Universe. The instrument revives the cylinder design in radio astronomy with a wide field survey as a primary goal. Modern low-noise amplifiers and digital processing remove the necessity for the analog beam forming that characterized previous designs. The Pathfinder consists of two cylinders 37m long by 20m wide oriented north-south for a total collecting area of 1,500 square meters. The cylinders are stationary with no moving parts, and form a transit instrument with an instantaneous field of view of ~100 degrees by 1-2 degrees. Each CHIME Pathfinder cylinder has a feedline with 64 dual polarization feeds placed every ~30 cm which Nyquist sample the north-south sky over much of the frequency band. The signals from each dual-polarization feed are independently amplified, filtered to 400-800 MHz, and directly sampled at 800 MSps using 8 bits. The correlator is an FX design, where the Fourier transform channelization is performed in FPGAs, which are interfaced to a set of GPUs that compute the correlation matrix. The CHIME Pathfinder is a 1/10th scale prototype version of CHIME and is designed to detect the BAO feature and constrain the distance-redshift relation. The lessons learned from its implementation will be used to inform and improve the final CHIME design.

Paper Details

Date Published: 22 July 2014
PDF: 20 pages
Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 914522 (22 July 2014); doi: 10.1117/12.2054950
Show Author Affiliations
Kevin Bandura, McGill Univ. (Canada)
Graeme E. Addison, The Univ. of British Columbia (Canada)
Mandana Amiri, The Univ. of British Columbia (Canada)
J. Richard Bond, Canadian Institute for Theoretical Astrophysics (Canada)
Canadian Institute for Advanced Research (Canada)
Duncan Campbell-Wilson, Univ. of Sydney (Australia)
Liam Connor, Canadian Institute for Theoretical Astrophysics (Canada)
Univ. of Toronto (Canada)
Jean-François Cliche, McGill Univ. (Canada)
Greg Davis, The Univ. of British Columbia (Canada)
Meiling Deng, The Univ. of British Columbia (Canada)
Nolan Denman, Univ. of Toronto (Canada)
Matt Dobbs, McGill Univ. (Canada)
Mateus Fandino, The Univ. of British Columbia (Canada)
Kenneth Gibbs, The Univ. of British Columbia (Canada)
Adam Gilbert, McGill Univ. (Canada)
Mark Halpern, The Univ. of British Columbia (Canada)
David Hanna, McGill Univ. (Canada)
Adam D. Hincks, The Univ. of British Columbia (Canada)
Gary Hinshaw, The Univ. of British Columbia (Canada)
Carolin Höfer, The Univ. of British Columbia (Canada)
Peter Klages, Univ. of Toronto (Canada)
IBM Canada (Canada)
Tom L. Landecker, Dominion Radio Astrophysical Observatory, National Research Council Canada (Canada)
Kiyoshi Masui, The Univ. of British Columbia (Canada)
Canadian Institute for Advanced Research (Canada)
Juan Mena Parra, McGill Univ. (Canada)
Laura B. Newburgh, Univ. of Toronto (Canada)
Ue-li Pen, Canadian Institute for Theoretical Astrophysics (Canada)
Jeffrey B. Peterson, Carnegie Mellon Univ. (United States)
Andre Recnik, Univ. of Toronto (Canada)
J. Richard Shaw, Univ. of Toronto (Canada)
Kris Sigurdson, The Univ. of British Columbia (Canada)
Mike Sitwell, The Univ. of British Columbia (Canada)
Graeme Smecher, McGill Univ. (Canada)
Rick Smegal, The Univ. of British Columbia (Canada)
Keith Vanderlinde, Univ. of Toronto (Canada)
Don Wiebe, The Univ. of British Columbia (Canada)

Published in SPIE Proceedings Vol. 9145:
Ground-based and Airborne Telescopes V
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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