The Canadian Hydrogen Intensity. Mapping Experiment. Matt Dobbs
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1 The Canadian Hydrogen Intensity Mapping Experiment Matt Dobbs
2 today (slide adapted from NASA publicity figure) CHIME Overview
3 today (slide adapted from NASA publicity figure) TODAY CHIME Overview
4 Galaxy Surveys vs. Intensity Mapping Galaxy Surveys! ~1% (2 Gpc 3 /h 3 ) of the universe has been mapped with optical light from galaxies.! Galaxy surveys are expensive! Rely on (non-linear) galaxies as tracers for BAO BAO Scale Unresolved galaxies, resolved BAO. Blanton et al. (2003) Matt.Dobbs@McGill.ca, CHIME Overview
5 21 cm Hydrogen Line Rate 3 x /s HI map of the Milky Way (Parkes Telescope) Frequency gives redshift: ν = 1420MHz / (1+z) Oort et al Matt.Dobbs@McGill.ca, CHIME Overview
6 3-D Intensity Mapping CHIME Overview
7 Cosmic Sound Start: z=0.01 End: z=0.62 Simulation Video: Nick Gnedin & Dave McGinnis (Fermilab), CHIME Overview
8 Mapping Age of Universe the CMB 0 300ky Big Bang Observable 500My Universe 7Gy CHIME CHIME will: z survey BAO measure the growth of space from 0.8<z<2.5 over a volume of ~400 comoving Gpc Gy SDSS WiggleZ SPT Reionization Slide from K. Vanderlinde Matt.Dobbs@McGill.ca, CHIME Overview
9 Illinois 400 (120x180m) 1959! 610 MHz! BW ~ 5 MHz Illinois 1937: Grote Reber, 9m First parabolic dish radio telescope Sky survey Green Bank Telescope, 100m Matt.Dobbs@McGill.ca, CHIME Overview
10 Cylinder Antenna CHIME Overview
11 Cylinder Telescope CHIME Overview
12 CHIME CHIME Overview
13 The Canadian Hydrogen Intensity Mapping Experiment UBC! Mandana Amiri! Greg Davis! Meiling Deng! Mark Halpern! Gary Hinshaw! Kris Sigurdson! Mike Sitwell McGill U! Kevin Bandura! Jean-Francois Cliche! Matt Dobbs! Adam Gilbert! David Hanna! Juan Mena Parra View poster! U Toronto / CITA! Dick Bond! Ue-li Pen! Richard Shaw! Keith Vanderlinde! Ivan Padilla HIA, DRAO! Tom Landecker
14 The Canadian Hydrogen Intensity Mapping Experiment a transit telescope no moving parts one scan strategy 24/7 observations no TAC (time allocation committee)
15 Full CHIME Specs Full CHIME Layout Structure 5 cylinders, 100m x 20m each Bandwidth MHz Digitize 8bits at 800 MSPS Number Feeds/cylinder 256 dual pol feeds per cylinder (2560 digitizers total) ~31cm spacing Frequency Channels 512 frequency channels, 781 khz wide (1.28 µs) (for cosmology, you can channelize further!) Data Rate 2N FEEDS x 3.2 Gbit/s = 8 TeraBit/s (assumes 4bit truncation) Observing Frequency 400 MHz to 800 MHz Wavelength 75 cm 37 cm 21cm Redshift z=2.5 (11 Gyr ago) z=0.8 (7 Gyr ago) Beam Size 0.52 o 0.26 o E-W FoV 2.5 o 1.3 o N-S FoV Time/pixel/day Receiver Noise Temperature Flux Conversion Daily Sensitivity Final Survey 10min, 14min, 24hrs equator, 45deg, ncp -45 o to +135 o (max possible) 0 o to +90 o (more likely) 5min, 7min, 24hrs equator, 45deg, ncp 50k ~2K / Jy ~50 µjy / pixel ~1.5 µjy/pixel (Approximate for planning purposes only) Matt.Dobbs@McGill.ca, CHIME Overview
16 CHIME CHIME Overview
17 CHIME Overview
18 CHIME Overview
19 CHIME Overview
20 CHIME Overview
21 CHIME Overview
22 Two FMC Mezzanines (analog signals come in the front) 9U VME Front-panel FPGA Custom Backplane Power, clock, timestamp Board inter-connect ARM processor DDR RAM Ethernet Digital signals come in the back Two Gbit Ethernet CHIME Overview
23 CHIME Overview
24 1 TB/s = 86 PB/day Matt.Dobbs@McGill.ca, CHIME Overview
25 1280 x 10 Gbe Matt.Dobbs@McGill.ca, CHIME Overview
26 CHIME& Development& Prototype, two 8m Dishes 4 channels running since March 2011 Pathfinder, two 20m x 40m Cylinders 256 channels under construction Full CHIME, five 20m x 100m Cylinders 2560 channels FUNDED by CFI. Operating in m 40m Matt.Dobbs@McGill.ca, CHIME Overview
27 DRAO CHIME Site Jan 2013: Construction of CHIME Pathfinder CHIME Overview
28 DRAO CHIME Site Pathfinder construction, April 14, 2013 CHIME Overview
29 Beyond Cosmology! Chime will map the polarization and intensity of 40% of the sky with great sensitivity in a poorly explored frequency band.! Pulsar monitoring " Nightly all-sky monitoring for Pulsar Timing Arrays " Monitor space weather, to correct observations at higher frequency.! Pulsar search " Detect new pulsars, then monitor them daily.! Radio transient phenomena " New ground. " Surprisingly bright and distant radio events have been reported recently. CHIME is an ideal all-sky monitor.! Galactic Magnetic Fields Matt.Dobbs@McGill.ca, CHIME Overview
30 Summary! Intensity mapping new tool to map the expansion history of the universe. " z=1-3 key for Dark Energy! FFT Telescope will come of Age with CHIME seeing the whole overhead sky at once.! CHIME will map the largest volume of the universe to z date.! CHIME will measure the expansion of space in a large chunk of the observable universe, to z~2.5.! Hydrogen mapping can (in theory) probe anything to z~> CMB SDSS WiggleZ Reionization Big Bang CHIME SPT Matt.Dobbs@McGill.ca, CHIME Overview
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