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LOFAR Beam Formed (BF) Data & Pipeline Overview September 9, 2010

LOFAR Beam Formed (BF) Data & Pipeline Overview September 9, 2010. Anastasia Alexov & The Pulsar Working Group & ASTRON SW Group. Transient Science.

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LOFAR Beam Formed (BF) Data & Pipeline Overview September 9, 2010

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  1. LOFAR Beam Formed (BF) Data & PipelineOverviewSeptember 9, 2010 Anastasia Alexov & The Pulsar Working Group & ASTRON SW Group

  2. Transient Science • Pulsar/Beam-Formed Pipeline has many scientific applications. The following areas of study set the requirements on processing for each of the modes: • Known pulsars - channelization, Stokes Parameters, dedispersion, folding, Radio Frequency Interference (RFI) excision • Pulsar/fast transient survey - channelization, dedispersion [10,000 trial Dispersion Measures (DMs)], RFI excision, searching • Planets, Sun, flare stars - channelization, RFI excision, dynamic spectra, Stokes Parameters Pulsar SOHO Sun

  3. LOFAR “Beams” Tied-Array (Pencil) Beams Station Beams • Low Band Antennas (LBA): 10-80MHz • High Band Antennas (HBA): 100-240MHz • One to N Stations can be use to observe • Imaging and high time resolution observations can be done simultaneously • High time resolution observing mode will be widely used for Transient Science: • Forming multiple beams is a difficult observing mode • Beam-formed modes trade spatial resolution for time resolution • Pulsar Pipeline effort can be applied to other high timing resolution pipelines Element Beams Stations

  4. LOFAR “Beams” • Show Movie

  5. Beam-Formed Data Flow On-Line TAB Pipeline BF Writer BF Offline Pipeline

  6. Beam-Formed Pipeline Data Flow On-Line TAB Pipeline BF Writer BF Offline Pipeline

  7. BF -> to -> H5 Writer (bf2h5) Tied-Array (Pencil) Beams • BF Raw and BF TAB data  HDF5 BF file • Need online (BG/P TAB data) and • single-station (raw data only) • versions of bf2h5 • BF H5 Structure: Sub-Array Pointing Station Beams Element Beams Stations

  8. Data Packaging Options: One Table per Subband (1D) [Shown] One Table for all Subbands (ND) One Array per Subband (1D) One Array for all Subbands (ND)

  9. Beam-Formed Data Sizes (Challenging)

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