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TRANSCRIPT
MWA Project:
MWA Project:
Site: Murchison Radio Observatory Australia’s proposed SKA Site
Strategy: 512 Antenna “Tiles”• Explore “Large N / Small D” regime• Correlate all pairs• Instantaneous complete UV coverage• confront issues with Wide-Field Imaging, Foregrounds, Dynamic Range, …
MWA Project:
Science goals: Epoch of Re-ionization Transients, Sun, …
Implications… Compact, Dense Array Diameter ~ 1.5 km Frequency coverage 80-320 MHz
MWA Project: Consortium:• MIT Haystack Observatory• MIT Kavli Institute• Harvard-Smithsonian Center for Astrophyics• Australian universities (Curtin, ANU, Melbourne, Swinburne, Sydney, Tasmania, Western Australia, …)
• Raman Research Institute • CSIRO/ATNF
Antenna tile (~4m diam.)
clusters
Array (~1.5km diam.)tile
Cluster (50-100m diam.)
node
Coax outTile beamformer Fiber out
Central Processing
Hierarhical groupings
Digital Beamformer• ambient temperature• (early design)
Receiver Node Housing• 64 Nodes• Coax RF input from 8 Tiles• Fiber digital output
Derek Caroll - PSI
Fielded Enclosure
Correlator:
• FPGA based “hardware correlator” and fine Filter Bank (10KHz channels)
• Correlate all pairs => 130,816 Interferometer Baselines
• (Prototyping & Testing … baseband recorders, software filter banks and correlators, …)
Aerial Photo of 32 Tile Prototype Array: Nov 2007
Locations of Antenna Tiles in 32T Array
West-East [m]
Hydra A
Hydra A115 MhzJan 2010
Hydra A121 MhzChris WilliamsSep 2010
Pictor A
Fornax A
Pictor A
Fornax A
Pictor A
Parkes Catalog
Pictor A
Parkes Catalog
MWA Sources
32T Image114 MHz
21 57 05.8-69 41 22 UV coverage
Full Hour Angle Coverage
Centaurus A
Centaurus A
MWA 32T 115 MHz
Centaurus A
Comparison with X-ray observations
Solar Radio Bursts 170-200 MHz Oberoi, Matthews, et al
Grid of Radio Spectraacross theface of the Sun
Oberoi, Matthews, et al
Oberoi, Matthews, et alInstantaneous 32T uv-coverage
Ord, Mitchell & Greenhill“2PiP”
baseband recording system
Vela
Ord, Mitchell & Greenhill“2PiP”
baseband recording system
MWA FutureMilestones:• 32 Tile Array …… Feb 2010• 512 Tile Array …. --> 2011
MWA Lessons• development of/on new site is hard
• distributed, international project needs “project management”
• (… takes longer and costs more than expected)
• complete instantaneous uv-coverage is very
powerful