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CASPER Update from Parkes

CASPER Update from Parkes. Matthew Bailes Willem van Straten, Andrew Jameson Jonathon Kocz, Ben Barsdell, Paul Coster + HITRUN team. Crab pulsar. Pulsars go this way. Magnetic Field - Period Diagram. “Noisy”. “Smooth”. HITRUN Pulsar Surveys (Keith et al. 2010).

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CASPER Update from Parkes

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  1. CASPER Update from Parkes Matthew Bailes Willem van Straten, Andrew Jameson Jonathon Kocz, Ben Barsdell, Paul Coster + HITRUN team

  2. Crab pulsar Pulsars go this way Magnetic Field - Period Diagram “Noisy” “Smooth”

  3. HITRUN Pulsar Surveys(Keith et al. 2010) • Digital Versions of the Parkes MB Surveys • 13 x 1024 x 64 us • Medium-Latitude Survey (540s) • Ultra-deep Survey (4000s) • All-sky Survey (260s) • Better for high-DM MSPs • Better for Radio bursts

  4. Berkeley-Parkes-Swinburne-Recorder“BPSR” Dedicated fibre 5 TB/day

  5. BPSR Hardware Set-up 13 iBOBs - 3K USD each 13 PCs with 10 Gb ethernet 1 Server Produces 1024 x 2bits every 64 us 10x better time resolution 5 TB/day! <100K

  6. Time Series

  7. Bandpasses

  8. HITRUN Regions

  9. MSPs • HITRUN: 21 MSPs • P-ALFA: 9 MSPs? • MSP with a main sequence companion • (PSR J1903+0327)? • FERMI-Related: ~20-30 MSPs • Mostly short-period and many close • GBT Drift 350 MHz: 6 MSPs?? • MSP occasionally super-bright

  10. 1 “Magnetar” 120 20 “RRATs” 21 “MSPs”

  11. Classic Eclipsing Pulsar (Bates et al 2010) PSR J1731-1845 P=2.3 ms Porb=8h Companion=0.03Mo Disappears for weeks at a time.

  12. Precision Timing:PSR J1017-7156

  13. A Jupiter-mass “Planet” Pulsar Mc~ 0.001 Mo Porb~ 0.0907d D ~ 1.2 kpc?

  14. Planet masses

  15. RRATs • 20 new “RRATs” found from single pulses • RRAT definition waning. • Many RRATs pulse in groups • Classic RRAT definition/new class in doubt. • One RRAT became a pulsar! (Burke-Spoloar & Bailes) • New RFI removal techniques (Kocz et al.)

  16. RAW Cleaned

  17. Lorimer et al. 2007

  18. Lorimer Burst • Found other “examples” • In all beams. • With new RFI excision • Another ~6 • Startling distribution in the human second • RFI probable origin, not lightening

  19. Future: • Acceleration searching • Better RFI excision

  20. GPU-accelerated Processing

  21. GPU Achievements

  22. Barsdell et al. • Dedispersion: • C/fortran, single threaded, generic • Sigproc (Lorimer) 16 hours, 40 minutes • Dedisperse_all: • C++/OpenMP • HTRU software (Bailes) 80 minutes • GPUdedisperse: • CUDA/C++ • 300 seconds (C1060) ~200s on Fermi

  23. GPUseek (Coster, Bailes, Barsdell) • Builds on GPUdedisperse • Can do 10 x 8 Mpt FFTs + search per second per GPU. • Dedisperse->RAM • Foreach DM • Xfer to GPU • Unpack • FFT • Form power spectrum • Harmonic Sum • Seek spikes

  24. HITRUN medlat Survey • 95,472 beams of 2 GB each • ~200 TB. • 95,472 x 1196 DMs x 200 accelerations • 24 billion FFTs • Time for 1 GPU = 77 years. • “Smarter” FFT lengths/acc = 30 years.

  25. G star Supercomputer (SGI/Nvidia)~130 Tflops 1800 TB Stage 2: 2012 +100 Dual CPU/GPUs? 5 GB s-1 QDR Infiniband 51 x Dual GPU + 48 GB + 2 CPU 2 x Seven GPU + 48 GB + 2 CPU 2 x 512 GB + 4 CPU

  26. Do complete Acc Search 30 / 116 GPUs = 3 months! Find pulsars useful for tests of relativistic gravity

  27. Real-time Processing? • GPU benchmarks indicate: • Can dedisperse and RFI mask and FFT in real time. • Can have an RFI “weather station” • Confirm pulsars while still scintillating

  28. Final PKS Set-up HIPSR 2 x 400 MHz (8 bit) ROACH Dual CPU Dual GPU RFI MASK X 13 X 7 X 8 Ring buffers Dual CPU Dual GPU CASPSR InfiniBand Switch Demux X 4 A/D +TerriBoB 2 x 400 MHz (8 bit) Demux Dual CPU 96 TB disk 12.8 Gb s-1

  29. HITRUN Ultra-deep Survey • Ng et al. • 70 minute pointings: • Finding 5 pulsars/24h day of observing • On track for 500 new pulsars • HITRUN total: • ~650 pulsars (cf 1950 known)

  30. Pulsar Timing Count the Pulses!

  31. PSR J1600-3053 Form a Profile Cross Correlate Get time of arrival

  32. Coherent vs Incoherent Dedispersion • Worthwhile if: • Narrowest feature is < dispersion smear time • Not worthwhile in: • Pulsar searches for “standard” pulse widths • High frequency/low DM timing

  33. The Information Flood: 13 years, factor of 100 in information. Factor of better than 1000 in $/byte/sec • # bits?, 2 pols, Nyquist sampling • 1997, S2 VLBI recorder, 16 MB/s, 700K • 1999, CPSR1, 20 MB/s, 600K • 2002, CPSR2, 128 MB/s, 400K • 2009, APSR, 1 GB/s, 250K • 2010, CASPSR, 1.6 GB/s, 60K

  34. Other Benefits 13 years, factor of 100 in information. Factor of better than 1000 in $/byte/sec • Time to “market” • 1997, S2 VLBI recorder, 16 MB/s, 700K, 1 month • 1999, CPSR1, 20 MB/s, 600K, 2 weeks • 2002, CPSR2, 128 MB/s, 400K, 5 minutes • 2009, APSR, 1 GB/s, 250K, 30 seconds • 2010, CASPSR, 1.6 GB/s, 60K, 40 seconds

  35. Verbiest et al. (2008) CPSR1 Incoherent S2 CPSR2

  36. CABB A/D DFB3 (Manchester/Hampson/Brown)APSR (+Bailes/van Straten/Jameson) 2 x 16 x 64 MHz PFB PFB-1 Switch Processors APSR 8096 Mb s-1 DFB3 8 Gb s-1

  37. DFB3 + lightening

  38. APSR + lightening

  39. Artifacts Artifacts Separation is interchannel dispersion delay

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