The Allen Telescope Array

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The Allen Telescope Array
SKA 2004 July 19, 2004
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The Allen Telescope Array

• RAL
• Leo Blitz
• Douglas Bock
• Geoff Bower
• Calvin Chang
• Matt Dexter
• Greg Engargiola
• Ed Fields
• Matt Fleming
• Colby Kraybill
• Dave McMahon
• Doug Thornton
• Lynn Urry
• Jack Welch
• Mel Wright

• SETI Institute
• Rob Ackermann
• Larry DAddario
• Mike Davis
• Dave DeBoer
• John Dreher
• Gerry Harp
• Girmay-Keleta
• Jill Tarter

Other Ed Ackermann John Andersen Charlie
Cox Niklas Wadefalk Sandy Weinreb
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The Allen Telescope Array

• Introduction
• Antenna
• Signal Path
• Control
• Site
• Status

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The Allen Telescope Array
Introduction Antenna Signal Path Control
Site Status

• Joint project between SETI Institute and UCB
  Radio Astronomy Lab
• Located at Hat Creek in N. CA
• Goal of 350 6.1-meter antennas (and beyond)
• Funded to-date primarily by Paul G. Allen
  Foundation

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Science Goals
Introduction Antenna Signal Path Control
Site Status

• 3 year survey to map all Galaxies out to 300 Mpc
  and extragalactic clouds in HI
• Frequent, fast all-sky surveys to explore
  transient phenomenon (5 days)
• Pulsar monitoring/survey
• Magnetic field transition regions (Zeeman)
• Large-scale surveys at other frequencies (e.g.
  CCS, H2CO, H2CS,C4H, CH3OH, OH, CH, CH2NH,
  CH3NH2, HCOOH, HC5N, HC7N, HC9N)
• SETI

Multiple concurrent
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Design Goals for the ATA
Introduction Antenna Signal Path Control
Site Status
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Hat Creek Radio Observatory
Introduction Antenna Signal Path Control
Site Status
ATA
BIMAOVRO CARMA
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Antenna
Introduction Antenna Signal Path Control
Site Status

• 6.1-meter offset Gregorian (2.4-meter secondary)
• rim-supported, hydroformed dishes

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Antenna
Introduction Antenna Signal Path Control
Site Status
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Antenna Surface
Introduction Antenna Signal Path Control
Site Status

• rms 0.022 (0.56mm)
• p-p 0.118 (3mm)

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Shipment
Introduction Antenna Signal Path Control
Site Status
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Shipment
Introduction Antenna Signal Path Control
Site Status
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Many Antennas
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Signal Path
Introduction Antenna Signal Path Control
Site Status
Correlator SETI detectors ASP
Field Lab
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Signal Path
Introduction Antenna Signal Path Control
Site Status
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Feed
Introduction Antenna Signal Path Control
Site Status
221
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Front-End
Introduction Antenna Signal Path Control
Site Status
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Balun/LNA
Introduction Antenna Signal Path Control
Site Status
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Full Spectrum
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Control
Introduction Antenna Signal Path Control Site
Status

• Javabased client-server JSDA (Java Simple
  Distributed Architecture)
• TCP/IP, UDP/IP
• Jython scripting
• SBC at each antenna does its own housekeeping
• Hierarchical controllers thru processor
• Monitor less is more

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Beam Pattern Client
Introduction Antenna Signal Path Control Site
Status
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ATA-350 Configuration
Introduction Antenna Signal Path Control
Site Status
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Beam
Introduction Antenna Signal Path Control
Site Status
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ATA-32
Introduction Antenna Signal Path Control
Site Status
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ATA-32
ATA-32
(This year)
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Construction Site
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Cable Vault
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Trench/Foundation
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Trenches
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BIMA
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Old New
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Measurements
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Silo/Holography
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Photogrammetry
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Number of Elements/Schedule
Introduction Antenna Signal Path Control
Site Status
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End
http//www.seti.org http//astro.berkeley.edu/RAL