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Phased Array Feed Development

Phased Array Feed Development. FAST Visitors, July 23, 2010 – Charlottesville, Va. Rick Fisher. Phased Array Feed Project. Collaboration with Brigham Young University First PAF demo 1997 on 43-m telescope Objective: Maximize A 2 eff Ω /T 2 sys Key technical challenges

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Phased Array Feed Development

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  1. Phased Array Feed Development FAST Visitors, July 23, 2010 – Charlottesville, Va • Rick Fisher

  2. Phased Array Feed Project • Collaboration with Brigham Young University • First PAF demo 1997 on 43-m telescope • Objective: Maximize A2effΩ/T2sys • Key technical challenges • Compensation for mutual coupling between array elements • Noise reduction with cryogenics

  3. Beamforming Receiver Chains Digital Beamforming Reflector FPA LNAs

  4. Formed Beam Patterns Source: Cas A, 1612 MHz 0.1 degree pointing grid

  5. Cygnus X Region Mosaic Canadian Galactic Plane Survey Convolved to 20-m Beam

  6. Noise Budget (Uncooled Array) MeasuredModel LNA Tmin33 K 33 K Noise coupling 20 K 23 K Spillover 5 K 5 K Sky 3 K 3 K Loss 4 K -- Tsys: 65 K 64 K ---------- ----------

  7. Next Steps

  8. Dewar Close-up 1020 Refrigerator LNA – Antenna Element Interface

  9. Cryogenic Amplifier Interface Dual Channel LNA (@15K) Interface to Antenna Element (@300K, at least initially)

  10. Development System Evolution

  11. Final Configuration

  12. First Science PAF Instrument • 7-Beam, 19-Element Array on GBT • Tsys < 25 K, Aperture Efficiency > 0.7 • 450-MHz R.F. Bandwidth • 300 MHz Beamformer with Pulsar Search Capability • http://science.nrao.edu/paf

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