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Transient SETI

Transient SETI. Dan Werthimer University of California, Berkeley. http://seti.berkeley.edu/. University of California, Berkeley SETI Program. Graduate Students Chen Chang, Pierre Droz, Aaron Parsons, David Purdy Undergraduate Students

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Transient SETI

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  1. Transient SETI Dan Werthimer University of California, Berkeley http://seti.berkeley.edu/

  2. University of California, Berkeley SETI Program • Graduate Students Chen Chang, Pierre Droz, Aaron Parsons, David Purdy • Undergraduate Students Daniel Chapman, Henry Chen, Charlie Conroy, Wonsop Sim • Astronomers, Computer Scientists and Engrs. David Anderson, Bob Bankay, Jeff Cobb, Court Cannick, Eric Korpela, Matt Lebofsky, Jeff Mock, Rom Walton, Dan Werthimer

  3. Early Transient Transmitters

  4. NOTFUNDED

  5. NOTFUNDED

  6. Porno in space: FUNDED!

  7. UC Berkeley SETI Programs

  8. AstroPulse • Arecibo Sky survey • Covers decs 0 to 30, each beam 5 times • 1420 MHz, 2.5 MHz bandwidth • 7 years of data recorded so far (70 TB) • Good time resolution • Sensitive to 0.4 µs radio pulses at 21 cm • DM range • -1000 to +1000 pc/cm3 • Sensitivity • 10-18 W/m2 peak (Coherent de-dispersion)

  9. AstroPulse • Only ~1.5 searches for single pulses on µs timescale before (O’Sullivan, Phinney) • Pulsar searches: ms time scales, folded • SETI@home: 0.8 ms single pulses. • Potential astrophysics as well as SETI • evaporating primordial black holes? (Hawking, Rees, Ekers) • Pulsars, Other astrophysical exotica?

  10. Piggyback ALFA Sky Survey • Improved sensitivity • Tsys, integration time • Uniform sky sampling • galactic plane concentration • Multibeam RFI rejection • Larger Bandwidth

  11. Pulsed vs. CW Concentrating power into short bursts can be more efficient than a “constantly on” transmitter. Pulsed signals can be easier to see above background noise.

  12. Dispersion Coherent De-dispersion -1000 < DM < +1000 Requires lots of Computing!!!

  13. AstroPulse Testing Sample batch of data run through shows expected noise characteristics, and little else … … so (hopefully) little RFI contamination for this type of signal.

  14. BOINC • Berkeley Open Infrastructure for Network Computing • General-purpose distributed computing framework. • Open source. • Will make distributed computing accessible to those who need it. (Starting from scratch is hard!)

  15. Projects • Astronomy • SETI@home (Berkeley) • Astropulse (Berkeley) • Einstein@home: gravitational pulsar search (Caltech,…) • PlanetQuest (SETI Institute) • Stardust@home (Berkeley, Univ. Washinton,…) • Earth science • Climateprediction.net (Oxford) • Biology/Medicine • Folding@home, Predictor@home (Stanford, Scripts) • FightAIDSathome: virtual drug discovery • Physics • LHC@home (Cern) • Other • Web indexing/search • Internet Resource mapping (UC Berkeley)

  16. SETI@home Statistics TOTAL RATE

  17. Optical SETI Pulse Search 1961 Charlie Townes Paper largely ingored until 1999 1971 Cyclops report calculates radio >> optical Today’s lasers can communicate across galaxy

  18. Optical SETI • Uses Leuschner Observatory (UCB) • Automated 0.8m telescope • Targeted Search • Nearby F,G,K,M stars • ~10,000 stars observed so far • 100 galaxies

  19. OSETI Detector • 3-Photomultiplier fast coincidence detector • Sensitive to 1ns pulses • Low background • False alarm rate: 1 per 300 hours (10-6 Hz) • Double false alarm rate: 1 per 600 years! • Good sensitivity • 10-8 W/m2 peak • 10-19 W/m2 average

  20. Transient Instrumentation

  21. Compute Module Diagram

  22. 19” 48RU Rack Cabin Capacity • 40 compute nodes in 5 chassis (8U) per rack • Up to 16 trillion CMac/s performance per rack • 250 Watt AC/DC power supply to each blade • 12.5 Kwatt total power consumption • Hardware cost: ~ $1M

  23. Global Interconnects • Commercial Infiniband switch from Mellanox, Voltaire, etc. • Packet switched, non-blocking • 24 ~ 144 ports (4X) per chassis • Up to 10,000 ports in a system • 200~1000 ns switch latency • 400~1200 ns FPGA to FPGA latency • 480Gbps ~ 2.88Tbps full duplex constant cross section bandwidth • <$400 per port

  24. Unified Digital Processing Architecture • Distributed per antenna spectral channel processing • Multiple reconfigurable backend application processing • Commercial packet switched interconnect • Backend data pulling through remote DMA access

  25. Moore’s Law in FPGA world 100X More efficient than micro-processors! 3X improvement per year!

  26. Future Spectrometers

  27. Why you might not want to collaborate with us on Transient Observations

  28. Seti Haiku

  29. Searching for lifeAnswers are revealedAbout ourselvesPaula Cook, Duke University

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