Canadian hydrogen intensity mapping experiment (CHIME) pathfinder

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DOIResolve DOI: http://doi.org/10.1117/12.2054950
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TypeArticle
Proceedings titleProceedings of SPIE - The International Society for Optical Engineering
ConferenceGround-Based and Airborne Telescopes V, 22 June 2014 through 27 June 2014
ISSN0277-786X
ISBN9780819496133
Volume9145
Article number914522
SubjectAirborne telescopes; Astrophysics; Cosmology; Frequency bands; Hydrogen; Low noise amplifiers; Mapping; Polarization; Power spectrum; Program processors; Radio astronomy; Acoustic oscillation; Astrophysical observatory; BAO; CHIME; Correlation matrix; Intensity mapping; Wide-field surveys
AbstractA 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.
Publication date
PublisherSPIE
LanguageEnglish
AffiliationNational Research Council Canada; National Science Infrastructure
Peer reviewedYes
NPARC number21275478
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Record identifierbf1a40e9-f1ba-4f79-b632-bcaa6d78a636
Record created2015-07-14
Record modified2016-05-09
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