Canadian Hydrogen Intensity Mapping Experiment (CHIME) Pathfinder

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 beamforming that characterized previous designs. The Pathfinder consists of two cylinders 37\,m long by 20\,m 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 $\sim$100\,degrees by 1-2\,degrees. Each CHIME Pathfinder cylinder has a feedline with 64 dual polarization feeds placed every $\sim$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.

arXiv comment20 pages, 12 figures. submitted to Proc. SPIE, Astronomical Telescopes + Instrumentation (2014)

References in corpus (13)

• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• A bright millisecond radio burst of extragalactic origin
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in the Data Release 10 and 11 galaxy samples
• Observational Probes of Cosmic Acceleration
• A Population of Fast Radio Bursts at Cosmological Distances
• The WiggleZ Dark Energy Survey: mapping the distance-redshift relation with baryon acoustic oscillations
• Baryon Acoustic Oscillations in the Ly-α forest of BOSS quasars
• Measurement of 21 cm brightness fluctuations at z ~ 0.8 in cross-correlation
• Measurement of Baryon Acoustic Oscillations in the Lyman-alpha Forest Fluctuations in BOSS Data Release 9
• All-Sky Interferometry with Spherical Harmonic Transit Telescopes
• Possibility of Precise Measurement of the Cosmological Power Spectrum With a Dedicated 21cm Survey After Reionization
• A Radio-Frequency-over-Fiber link for large-array radio astronomy applications
• The cloverleaf antenna: A compact wide-bandwidth dual-polarization feed for CHIME

Cited by in corpus (177)

• A bright millisecond-duration radio burst from a Galactic magnetar
• CHIME/FRB Detection of Eight New Repeating Fast Radio Burst Sources
• The CHIME Fast Radio Burst Project: System Overview
• Cosmology with Phase 1 of the Square Kilometre Array; Red Book 2018: Technical specifications and performance forecasts
• Lensing of Fast Radio Bursts as a Probe of Compact Dark Matter
• Data Analysis for Precision 21 cm Cosmology
• Probing Galactic Halos with Fast Radio Bursts
• Gravitational probes of dark matter physics
• CHIME/FRB Discovery of 25 Repeating Fast Radio Burst Sources
• Implications of a "Fast Radio Burst" from a Galactic Magnetar
• The first interferometric detections of Fast Radio Bursts
• CHIME/FRB Detection of the Original Repeating Fast Radio Burst Source FRB 121102
• Constraining ultra large-scale cosmology with multiple tracers in optical and radio surveys
• Connecting CO Intensity Mapping to Molecular Gas and Star Formation in the Epoch of Galaxy Assembly
• Semi-analytic forecasts for JWST -- II. physical properties and scaling relations for galaxies at z = 4-10
• Galaxy formation in the Planck Millennium: the atomic hydrogen content of dark matter halos
• The Impact of a Supernova Remnant on Fast Radio Bursts
• Future Cosmological Constraints from Fast Radio Bursts
• Discovery and Follow-up of Rotating Radio Transients with the Green Bank and LOFAR Telescopes
• Constraining the primordial black hole abundance with 21cm cosmology
• Semi-analytic forecasts for JWST -- IV. Implications for cosmic reionization and LyC escape fraction
• The CHIME Pulsar Project: System Overview
• Interpreting the unresolved intensity of cosmologically redshifted line radiation
• Constraints on the primordial curvature power spectrum from primordial black holes
• A new measurement of the Hubble constant using Fast Radio Bursts
• A User's Guide to Extracting Cosmological Information from Line-Intensity Maps
• Are the distributions of Fast Radio Burst properties consistent with a cosmological population?
• Narrowband searches for continuous and long-duration transient gravitational waves from known pulsars in the LIGO-Virgo third observing run
• SKAO HI Intensity Mapping: Blind Foreground Subtraction Challenge
• Massive Warm/Hot Galaxy Coronae: II. Isentropic Model
• Realfast: Real-Time, Commensal Fast Transient Surveys with the Very Large Array
• Understanding the Diversity of 21 cm Cosmology Analyses
• COMAP Early Science: I. Overview
• Constraining cosmology and ionization history with combined 21 cm power spectrum and global signal measurements
• Search for CII Emission on Cosmological Scales at Redshift Z~2.6
• Cosmology-independent estimate of the fraction of baryon mass in the IGM from fast radio burst observations
• Reconstructing large-scale structure with neutral hydrogen surveys
• Two long-term intermittent pulsars discovered in the PALFA Survey
• Intensity mapping with SDSS/BOSS Lyman-alpha emission, quasars and their Lyman-alpha forest
• Precise measurements of inflationary features with 21 cm observations
• Hi intensity mapping with MeerKAT: Primary beam effects on foreground cleaning
• Streaming velocities and the baryon-acoustic oscillation scale
• Spherical Harmonic Analyses of Intensity Mapping Power Spectra
• A Self-consistent Framework for Multiline Modeling in Line Intensity Mapping Experiments
• Impact of Simulated 1/f Noise for HI Intensity Mapping Experiments
• Forecast for FAST: from Galaxies Survey to Intensity Mapping
• Lensing of Fast Radio Bursts by Binaries to Probe Compact Dark Matter
• DAYENU: A Simple Filter of Smooth Foregrounds for Intensity Mapping Power Spectra
• Fourier analysis of multi-tracer cosmological surveys
• Polarized Redundant-Baseline Calibration for 21 cm Cosmology Without Adding Spectral Structure
• The Tianlai Cylinder Pathfinder Array: System Functions and Basic Performance Analysis
• Nonlinear reconstruction
• Optimized Beam Sculpting with Generalized Fringe-Rate Filters
• On associating Fast Radio Bursts with afterglows
• Cosmological distance indicators
• A path to precision cosmology: synergy between four promising late-universe cosmological probes
• HI intensity mapping with MeerKAT: 1/f noise analysis
• Finding the Missing Baryons with Fast Radio Bursts and Sunyaev-Zeldovich Maps
• Strategies to Detect Dark-Matter Decays with Line-Intensity Mapping
• Cosmological-model-independent determination of Hubble constant from fast radio bursts and Hubble parameter measurements
• Mode switching and oscillations in PSR B1828-11
• Detailed study of ELAIS N1 field with the uGMRT -- II. Source Properties and Spectral Variation Of Foreground Power Spectrum from 300-500 MHz Observations
• Searching for Decaying and Annihilating Dark Matter with Line Intensity Mapping
• Lensing reconstruction from line intensity maps: the impact of gravitational nonlinearity
• Cosmology with fast radio bursts in the era of SKA
• Constraints on the evolution of the relationship between HI mass and halo mass in the last 12 Gyr
• Intensity mapping with neutral hydrogen and the Hidden Valley simulations
• Probing motion of fast radio burst sources by timing strongly lensed repeaters
• Intensity mapping cross-correlations II: HI halo models including shot noise
• A Synoptic VLBI Technique for Localizing Non-Repeating Fast Radio Bursts with CHIME/FRB
• Observing AGN feedback with CO intensity mapping
• Probing Diffuse Gas with Fast Radio Bursts
• Cosmic tidal reconstruction
• Gravitational waves $\times$ HI intensity mapping: cosmological and astrophysical applications
• 21 cm intensity mapping with the Five hundred metre Aperture Spherical Telescope
• Eliminating Primary Beam Effect in Foreground Subtraction of Neutral Hydrogen Intensity Mapping Survey with Deep Learning
• Halo nonlinear reconstruction
• Measuring the growth of structure with intensity mapping surveys
• Baryon acoustic oscillations reconstruction using convolutional neural networks
• Non-linear contributions to angular power spectra
• Constraining the Expansion History and Early Dark Energy with Line Intensity Mapping
• Analyzing the cosmic variance limit of remote dipole measurements of the cosmic microwave background using the large-scale kinetic Sunyaev Zel'dovich effect
• Redshift-space streaming velocity effects on the Lyman-$\alpha$ forest baryon acoustic oscillation scale
• Small-scale structure and the Lyman-$\alpha$ forest baryon acoustic oscillation feature
• Recovering lost 21 cm radial modes via cosmic tidal reconstruction
• A fast radio burst localized at detection to an edge-on galaxy using very-long-baseline interferometry
• Pulsar science with the CHIME telescope
• The Ooty Wide Field Array
• Power spectrum modelling of galaxy and radio intensity maps including observational effects
• Responses of Halo Occupation Distributions: a new ingredient in the halo model & the impact on galaxy bias
• How Density Environment Changes the Influence of the Dark Matter-Baryon Streaming Velocity on the Cosmological Structure Formation
• The spatial distribution of neutral hydrogen as traced by low HI mass galaxies
• Detecting Cosmic Reionization using Bi-Spectrum Phase
• Nonlinear reconstruction of redshift space distortions
• Accurate determination of halo velocity bias in simulations and its cosmological implications
• Feeding cosmic star formation: Exploring high-redshift molecular gas with CO intensity mapping
• Modelling redshift-space distortion in the post-reionization $\mathrm{HI}$ 21-cm power spectrum
• Fast Radio Bursts counterparts in the scenario of supergiant pulses
• Localizing FRBs through VLBI with the Algonquin Radio Observatory 10-m Telescope
• Canceling out intensity mapping foregrounds
• How else can we detect Fast Radio Bursts?
• On detecting repetition from fast radio bursts
• Prospects for measuring dark energy with 21 cm intensity mapping experiments
• Measuring HERA's primary beam in-situ: methodology and first results
• Extracting the 21 cm EoR signal using MWA drift scan data
• The Astrophysical Consequences of Intervening Galaxy Gas on Fast Radio Bursts
• Extracting HI Astrophysics from Interferometric Intensity Mapping
• Spectral Kurtosis Based RFI Mitigation for CHIME
• Synergies between radio, optical and microwave observations at high redshift
• A clock stabilization system for CHIME/FRB Outriggers
• A Generic and Efficient E-field Parallel Imaging Correlator for Next-Generation Radio Telescopes
• Anatomy of Cosmic Tidal Reconstruction
• The local PNG bias of neutral Hydrogen, ${\mathrm{H}}_{\mathrm{I}}$
• The Cross-correlation of KSZ Effect and 21 cm Intensity Mapping with Tidal Reconstruction
• Improving cosmological parameter estimation with the future 21 cm observation from SKA
• The HI-halo mass relation at redshift $z\sim 1$ from the Minkowski functionals of 21 cm intensity maps
• A new estimator for gravitational lensing using galaxy and intensity mapping surveys
• Deconvolving Pulsar Signals with Cyclic Spectroscopy: A Systematic Evaluation
• Axion dark matter-induced echo of supernova remnants
• The Tianlai dish array low-z surveys forecasts
• What if the fast radio bursts 110220 and 140514 are from the same source?
• The Breakdown Scale of HI Bias Linearity
• An Efficient Feedback Calibration Algorithm for Direct Imaging Radio Telescopes
• Testing gravity with gravitational waves $\times$ electromagnetic probes cross-correlations
• Physics Beyond The Standard Model with Circular Polarization in the CMB and CMB-21cm Cross-Correlation
• Mitigating radio frequency interference in CHIME/FRB real-time intensity data
• Bias of Damped Lyman-$\alpha$ systems from their cross-correlation with CMB lensing
• A Search of TESS Full Frame Images for a Simultaneous Optical Counterpart to FRB181228
• Estimates for the impact of Ultraviolet Background fluctuations on galaxy clustering measurements
• Constraining Cosmic Inflation with Observations: Prospects for 2030
• Simulated foreground predictions for HI at z = 3.35 with the Ooty Wide Field Array: I. Instrument and the foregrounds
• Constraining HeII Reionization Detection Uncertainties via Fast Radio Bursts
• HI intensity mapping with the MIGHTEE survey: power spectrum estimates
• Optimally Mapping Large-Scale Structures with Luminous Sources
• Delensing Degree-Scale $B$-Mode Polarization with High-Redshift Line Intensity Mapping
• A GPU Spatial Processing System for CHIME
• HI intensity mapping with MeerKAT: forecast for delay power spectrum measurement using interferometer mode
• Extreme Spheres: Counts-in-cells for 21cm intensity mapping
• Detection of Cosmic Structures using the Bispectrum Phase. I. Mathematical Foundations
• 1/f Noise Analysis for FAST HI Intensity Mapping Drift-Scan Experiment
• Redundant interferometric calibration as a complex optimization problem
• Direct Optimal Mapping for 21cm Cosmology: A Demonstration with the Hydrogen Epoch of Reionization Array
• Simultaneous Dependence of Matter Clustering on Scale and Environment
• High Cadence Optical Transient Searches using Drift Scan Imaging I: Proof of Concept with a Pre-Prototype System
• The parameter-free Finger-Of-God model and its application to 21cm intensity mapping
• High-redshift test of gravity using enhanced growth of small structures probed by the neutral hydrogen distribution
• A Self-Learning Neural Network Approach for RFI Detection and Removal in Radio Astronomy
• An Integrated System at the Bleien Observatory for Mapping the Galaxy
• Cross-Correlation Forecast of CSST Spectroscopic Galaxy and MeerKAT Neutral Hydrogen Intensity Mapping Surveys
• The ultimate frontier of 21cm cosmology
• Cosmology at high redshift -- a probe of fundamental physics
• Optimization and Commissioning of the EPIC Commensal Radio Transient Imager for the Long Wavelength Array
• Unveiling the Universe with Emerging Cosmological Probes
• Towards Accurate Modeling of Line-Intensity Mapping One-Point Statistics: Including Extended Profiles
• Design, operation and performance of the PAON4 prototype transit interferometer
• Toward a direct measurement of the cosmic acceleration: The pilot observation of H I 21cm absorption line at FAST
• Fast Simulation of Cosmological Neutral Hydrogen based on the Halo Model
• HI Intensity Mapping with the MIGHTEE Survey: First Results of the HI Power Spectrum
• Holographic Beam Measurements of the Canadian Hydrogen Intensity Mapping Experiment (CHIME)
• Calibration Schemes with $\mathcal{O}(N\log N)$ Scaling for Large-N Radio Interferometers Built on a Regular Grid
• Reconstructing the Long-wavelength Matter Density Fluctuation Modes from the Scalar-Type Clustering Fossils
• An efficient method for removing point sources from full-sky radio interferometric maps
• Differentiating Warm Dark Matter Models through 21cm Line Intensity Mapping: A Convolutional Neural Network Approach
• Application of Physics-Informed Neural Networks in Removing Telescope Beam Effects
• FAST Drift Scan Survey for HI Intensity Mapping. II. Stacking-based Beam Construction of the 19-feed Array at $1.4$ GHz
• Resolving Microlensing Events with Triggered VLBI
• Large, fast and accurate HI intensity maps with latent overlap diffusion
• Primary Beam Chromaticity in HIRAX: I. Characterization from Simulations and Power Spectrum Implications
• Atomic Hydrogen Shows its True Colours: Correlations between HI and Galaxy Colour in Simulations
• AlgoSCR: An algorithm for Solar Contamination Removal from radio interferometric data
• Removal of interloper contamination to line-intensity maps using correlations with ancillary tracers of the large-scale structure
• Impact of astrophysical effects on the dark matter mass constraint with 21cm intensity mapping
• Exploring HI Galaxy Redshift Survey Strategies for the FAST Core Array Interferometry
• HI Intensity Mapping cross-correlation with thermal SZ fluctuations: forecasted cosmological parameters estimation for FAST and Planck
• Forecasts on Interacting Dark Energy from 21-cm Angular Power Spectrum with BINGO and SKA observations
• Estimating constraints on cosmological parameters via the canonical and the differential redshift drift with SKA HI 21-cm observations
• Generalized Redundant Calibration of Radio Interferometers