ska aperture arrays - astron
TRANSCRIPT
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SKA Aperture Arrays
Jan Geralt Bij de Vaate ASTRON Ilse van Bemmel
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Sensitivity Comparison
SKA2
SKA1
LOFAR
EVLA Note: log scale!
SKA1 & SKA2 will have much higher sensitivity & survey speed than existing instruments
Aperture Arrays
Survey Speed Comparison
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SKA Schedule
2012 2013 2014 2015 2016 2017 2018 2019
SKA 1 SKA 2
AIP SKA2 selection
Stage 1 Pre construc/on
Stage 2
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• Share back-end development
2012 2013 2014 2015 2016 2017 2018 2019
SKA 1 SKA 2
AIP SKA2 selection
EMMA AIP 2000m2
AAVS2-‐low AAVS1-‐low
T+C 1 T+C 2 T+C 3
System
Eval Tile
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Assembling Element Level RFPs for Stage 1 Work
SoW
Pre-Stage 1
Planning Element 1 CoDR-SRR Work
Planning Element 2 CoDR-SRR Work
Planning Element N CoDR-SRR Work
RFP Bid
Def
ine
Top-
leve
l WB
S
Develop Stage 1 Legal, Bid Policy, T&C Contract Templates
Stage 1 Element MoAs
Nov/11 Oct/12
Assemble Work Package Consortia
review
Dec/12
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Expressions of Interest
• EoI’s semi public • 133 respondents • No real surprises
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Aperture Arrays
• LFAA + MFAA – ASTRON lead – ICRAR – INAF-IRA – JIVE – Observatoire de Paris – Raman Research Institute – Université de Bordeaux 1 – University of Cambridge – University of Malta – University of Manchester – University of Oxford
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LFAA Planning
• AAVS0: several elements
• AAVS1: 256 elements – 4 x 64 or 16 x 16
• AAVS2: 11500 elements (2% SKA1) – 23 x 500
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AAVS0: Log Periodic Dipole
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AAVS0: Vivaldi
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LFAA AAVS1
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LFAA AAVS1: system tests
• Electronics • Beamformer • Stability (gain) • Reliability (time stability) • A/T • Calibration
(input from Nima Razavi)
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LFAA AAVS1: astronomical verification
• Pulsar detection • Drift scans of bright sources • Tracking bright sources • Imaging capability • Beam switching experiments? • Multi-beam experiments?
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AAVS2
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LFAA AAVS2 technical tests
• Signal transport • Calibration • System stability • Correlation modes • Post processing • Beam
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LFAA AAVS2
1 hour, 4MHz bandwidth, 23 stations
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LFAA AAVS2 astronomical verification
• Imaging • Polarization (RM synthesis) • Pulsars • Solar system (dynamic spectra) • Ionosphere and space weather
LFAA AAVS2 is science capable!
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LFAA AAVS2 confusion limit
3km baseline
50 MHz
450MHz
30km baseline
450MHz
50MHz
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Uniboard Implementation
ADC Interface
Shelf: • 4 Processors • 8 ADC interfaces • 64 inputs (32 elements)
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Today
• To use the outcome of the meeting to shape-up our plans to get to the specification, design/development and verification of AA’s
• To identify risks in the current approach and work out alternatives if needed
Leading up to:
Aperture Array Design and Construction Consortium AADC