pulsar instrumentation using casper technology · figure courtesy gregory desvignes and ismael...
TRANSCRIPT
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Peter McMahon
JPL/CASPER Workshop, 11 June 2009
http://casper.berkeley.edu/wiki/Pulsar_Machine_Development_At_Berkeley
Presenting work with Don Backer, Joeri van Leeuwen, Dan Werthimer,The Fly’s Eye Team and the CASPER Group.
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Pulsar Instrumentation
ATA Fly’s Eye
The Parkes Spectrometer: Parspec
Berkeley ATA Pulsar Processor (BAPP)
Channelizers for Coherent Dedispersion (Nancay)
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Spectrometer for Incoherent Dedispersion Applications:
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Spectrometer for Coherent Dedispersion Applications:
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Lorimer, et. al., “A Bright Millisecond Radio Burst of Extragalatic Origin.” Science, 318, 2007.
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30Jy pulse (saturated digitizer on one of 13 receivers; appeared in two others)
DM = 375 pc/cm^3◦ Implies distance of up to 1 Gpc
Located away from other known sources
Found during search of 2001 archival data; no other pulses seen during 40 hour follow-up
We need more data to constrain the rate and to help determine what the source is.
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• Highly Energetic Radio Pulses from Extragalactic Sources
• Fly’s Eye Team: Geoff Bower, Jim Cordes, Griffin Foster, Peter McMahon, Andrew Siemion, Joeri van Leeuwen, Mark Wagner, Dan Werthimer (with help from RAL/CASPER)
• Objective: Build a set of independent spectrometers for the ATA and use them to search for HERPES.
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42x 6m dishes; 0.5-11GHz
4 independent IFs
First light in October 2007 (Galaxy M31 image)
Original target was 350 antennas; currently seeking grants for expansion
First solicitation of proposals in January 2008; before ~June 2008, engineering testing during the day and science at night.
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#1: Lots of time available.
#2: Small antennas, which have poor individual sensitivity, but wide beams.
We were awarded >400 hours on weekends.
Using all 42 antennas, we could cover a significant portion of the sky in 24 hours.
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44 independent spectrometers implemented in 11 IBOBs
209MHz bandwidth (sky frequency centred at 1430MHz)
128-channels each
1600Hz spectral dump rate
8-bits (with 64-bit debugging mode)
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IBOBs
Clock source
Switch
Control Computer
Storage Server
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Scripts on Fly’s Eye control machine set up IBOBs and control data recording.
Observations were done in 1-hour sets – after each hour, a 1-minute diagnostic run was done.
Packet loss statistics and spectra from diagnostic runs were uploaded to a web server.
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Good
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Advanced XAUI cable stability-control technology.
Radio Frequency Converter Boards
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Parkes multibeam pulsar survey
See http://astronomy.swin.edu.au/pulsar/?topic=hlsurvey
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400MHz 10GbE readout spectrometer
5.12us to 655us integration time
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B1937+21Glen Langston
J1028-5820Willem van Straten
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Berkeley ATA Pulsar Processor
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Image courtesy Joeri van Leeuwen.
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Berkeley-Orleans-Nancay (BON) system handles 128MHz bandwidth for pulsar timing using pre-CASPER hardware.
Intended upgrade to 400MHz.
FPGA performs coarse channelization, then CPU/GPU cluster performs coherent dedispersion and folding.
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Deployed IBOB-based upgrade in September 2008.
Reached conclusion that likely each computer will only be able to process a 100MHz bandwidth.
Hence final system will probably be ROACH-based (IBOB has 2x 10GbE; ROACH has 4x).
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Figure courtesy Gregory Desvignes and Ismael Cognard.
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Figure courtesy Gregory Desvignes and Ismael Cognard.
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http://casper.berkeley.edu/wiki/Pulsar_Machine_Development_At_Berkeley
http://casper.berkeley.edu/wiki/Parspec