Calibrating CHIME, A New Radio Interferometer to Probe Dark Energy
  The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a transit interferometer currently being built at the Dominion Radio Astrophysical Observatory (DRAO) in Penticton, BC, Canada. We will use CHIME to map neutral hydrogen in the frequency range 400 -- 800\,MHz over half of the sky, producing a measurement of baryon acoustic oscillations (BAO) at redshifts between 0.8 -- 2.5 to probe dark energy. We have deployed a pathfinder version of CHIME that will yield constraints on the BAO power spectrum and provide a test-bed for our calibration scheme. I will discuss the CHIME calibration requirements and describe instrumentation we are developing to meet these requirements. 
Laura B. Newburgh, Graeme E. Addison, Mandana Amiri, Kevin Bandura, J.   Richard Bond, Liam Connor, Jean-Fran\c{c}ois Cliche...
astro-ph.IM astro-ph.CO