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Update On The Square Kilometer Array

Update On The Square Kilometer Array. World Space Congress October 15, 2002 Jill Tarter. What Is The SKA?. An enormous increase in the capability for groundbased radio astronomy Increase in sensitivity by a factor of 100 above current arrays Wide range of science drivers

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Update On The Square Kilometer Array

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  1. Update On TheSquare Kilometer Array World Space Congress October 15, 2002 Jill Tarter

  2. What Is The SKA? • An enormous increase in the capability for groundbased radio astronomy • Increase in sensitivity by a factor of 100 above current arrays • Wide range of science drivers • Looking back to the dawn of galaxy formation • Mapping the structure of the early universe • Searching for evidence of other technological civilizations • Building to start ~2010 • “Born international”

  3. Stawman Design Goals

  4. Timeline • Annual science/technology workshops began in 1997 • Science With The SKA published in 1999 • 2000 MOU signed by representatives of 27 groups from 11 countries • International SKA Steering Committee formed • 7 “Whitepaper” end-to-end concepts submitted and reviewed – now being revised • Second round concept papers in 2004 • Concept and site selection 2005-6 • Construction begins in 2010

  5. Jansky 1937 - the beginning Radio Telescope Sensitivity

  6. Exponential increase in sensitivity x 105 since 1940 ! Radio Telescope Sensitivity

  7. The Cosmic Web Spectra of QSOs show many Ly-a absorption lines due to low col. density H N-body simulations predict the existence of a cosmic web Complicated structure of filaments and sheets of material SKA will detect this web In HI emission!

  8. Normal Galaxies At Large z

  9. for surveys and transient events in 106 galaxies ! SKA 6cm HST SKA’s 1o field-of-view SKA 20 cm 15 Mpc at z = 2 ALMA

  10. SKA Redshift Surveys

  11. SKA Poster Many beams offer great flexibility Many targets/users Interference rejection

  12. Chinese - KARST

  13. FASTA 500m Demonstrator

  14. Canadian - LAR

  15. Tether Concept

  16. Balloon andtail inflated 1/3 scale aerostat demonstrator funded Instrument Platform LAR Prototyping • 4 Focal Plane Array packages • covering 0.7-1.4 GHz • RF Feed design • Beam forming • Reflector actuators

  17. US – Large-N/Small-D 84 stations 35-350 km 76 stations 350-3500 km Inexpensive, hydroformed dishes 2320 12m antennas within 35 km core

  18. Based On The ATA

  19. Indian - Preloaded Parabolic Dishes

  20. European – Phased Array Tiles

  21. First Prototype Tile Of 1024 Elements

  22. Australian – Luneburg Lens

  23. How Does This Work?

  24. Multiple Feeds And Beams

  25. 7-arm Spiral Configuration

  26. Australian – Cylindrical Reflector RF and Digital Beamforming

  27. Cylindrical Lens Configuration

  28. For SETI, • factor of 100 • in sensitivity • another factor of 10 in distance The Square Kilometer Array Like SETI, the SKA is intrinsically international Decision on concept and site(s) ~ 2005

  29. Expand The Galactic Exploration SKA ATA Phoenix

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