ARTEMIS, a fast transient search machine for LOFAR international stations

Transcript

1. The  Sun Pulsars Radio   Transients Interstellar   Medium Nanosecond

     Astronomy Ionosphere Cosmic  Rays The  Unknown LOFAR  staAon Beamformed Data

2. LOFAR international stations • Large collecting area (96 coherently added

   dipoles), high sensitivity. • Very fast sampling rate (5 ns), reduced to 5.12 µs for the station beams. • Large fields of view, 10s to 100s of square degrees. • Not used for all LOFAR KSPs.

3. Dispersion searches DM 0 N2 or N logN process per

   time sample (N > 1000 -- 10000+ samples/sec HPC computing

4. 3.2Gbps data reduced data 800Mbps data 800Mbps data 800Mbps data

   800Mbps data

5. getting the data Flagging for interference Channelisation Voltage to Power

   (Stokes) dispersion search PELICAN: scalable C++ framework for distributed processing of streaming data pelican server pelican module Database Cloud / Citizen science pelican module pelican module pelican module Fred Dulwich Ben Mort Stef Salvini Chris Williams Alessio Magro Wes Armour Dalal Ait Allal Steve Roberts Mike Giles

6. time dispersion measure First light -> but too many detections!

7. Radio interference is localised

8. None

9. Terrestrial RFI pulsar dispersed transient?

10. frequency time Bright, short duration, broadband and frequency swept signals

    from...
11. None

12. Frequency (MHz) Time (ms) 8000 8200 8400 8600 8800 9000

    143 144 145 146 147 148 149 20 30 40 50 60 200 400 600 800 0 2000 4000 6000 8000 Time bin 40 60 100 200 300 400 500 600 700 800 900 dB Frequency channels Pulse

13. Frequency (MHz) Time (ms) 8000 8200 8400 8600 8800 9000

    143 144 145 146 147 148 149 16 18 20 22 24 26 28 30 200 400 600 800 0 200 400 Time bin 22 24 26 100 200 300 400 500 600 700 800 900 dB Frequency channels
14. None

15. Artemis 2.0 3.2Gbps port mirror 10gbe to 4x1gbe •9U including

    storage •parallel operations with ASTRON •cheaper and upgradable