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

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Presentation transcript:

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

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

LOFAR “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 Tied-Array (Pencil) Beams Stations Element Station

LOFAR “Beams” Show Movie

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

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

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

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)

Beam-Formed Data Sizes (Challenging)