PHAROS PHased Arrays for Reflector Observing Systems

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PHAROSPHased Arrays for Reflector Observing
Systems
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Dissemination

• Successful Faraday testing

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RECAP PHAROS System Parameters

• Frequency range 4 - 8 GHz (optimal for 4.0 - 7.0
  GHz)
• Number of antenna elements 364
• Number of beams 4, with 13 elements per beam
• Polarisation single
• Tsys lt 20 K

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Cryostat enclosure
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Antenna array
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(No Transcript)
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Beam-former
beam- former
power splitters
LNAs

• Design in progress
• Digital control tested at temps lt 70K

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Cryostat

• Change to plexi glass Window

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Control and calibration
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Advanced technology MMIC run

• 70nm GaAs mHEMT run executed
• Performance similar to difficult to access US
  foundries
• Samples received, testing in progress

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Summary progress

• Antenna array To be assembled and tested May
• MMICs Available
• Cryostat Ordered, tests finished in June
• Beamformer prototyping completed, final design
  needed
• Control and Calibration principle design done,
  hardware protos required

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Summary progress, constraints

• UMAN restarted
• Design, production and test completed in Nov.
  2007
• Final integration and test Dec. 2007
• Antenna pattern measurement and calibration
  Jan/Feb 2008
• Test on Lovell March 2008

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Summary progress, euros

• MECSA no budget constraints
• ASTRON man hour constraint extension contract
  J Simons required, not budgeted 25k
  other management and system design
  extended with 1 year 25k
• INAF no budget constraints
• UBIR no budget constraints
• TCfA no budget constraints
• UMAN tbd

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PHAROS testing

• European and Australian telescopes..
• 1) Lovell (25m dish for Holography on
  astronomical source) 2) Parks ?

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High lights

• Successful performance PHAROS/ASTRON team at 3rd
  International Focal Plane Array workshop Sydney
• PHAROS only FPA project that aims for low Tsys
• First demonstrator MIRI lt 100K
• First demonstrator APERTIF lt 100K

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Conclusion

• Good progress most packages
• Overall delay of one year not budgetary neutral