Meetings for the new SWARM data pipeline and CASA for SMA data reduction
 

Try out the SWARM2CASA pipeline for SMA users

  • 2018-08-01 at 9:00am HST and 3:00pm EDT
    •
  • Agenda:
    •

    • 1. Status and early tests
    • 2. Version 1.0.0 and setup on RTDC servers
    • 3. Realtime demonstration
        • RTDC server rtdc9
        Will work out issues on the servers in Hilo
    • 4. Tested items
      • Optimizing lower level I/O (C)
      • FITS standard data streams adaptable to CASA (Fortran)
      • Python module to execute CASA routines (C++)
      • CASA
        • Listobs for headers1
        • GUI plotms for variables & interactive editting
          •
            editing (flagging) spectral spikes -
            spectra -
            uv-coverage for calibrators and targets -
            fringe amplitude vs uvwave -
            fringe phase vs uvwave -
        • Issues
            • SMA antenna coordinates (right-handed geocentric system) -
            4.7.0 seems to interpret it correctly -
            The new versions 5.0.0, 5.1.0, 5.3.0 cann't -
              Requesting CASA/NRAO for helping out the SMA antenna coordinate issue2
    • 5. Further test & to do
      • CASA
        •
        • Calibration and imaging
          •
            Need to try out actual data from SMA science observation programs
            Reqeust internal scientists for end-to-end reduction of SMA data with the pipeline and CASA3.
      • SMA Pipeline
        •
        • swarmChecker.c
            • to classify the online data issues, providing more intelligent software to patch the data
        • collection of testing information and calibrator models
            • to correct and calibration via the pipeline
      _______________________
      1Tested versions: 4.7.0, 5.0.0, 5.1.0, 5.3.0
      2The issue of antenna header variables does not affect on calibrations and imaging, but correct coordinates are needed in baseline correction for re-calculating uv coordinates. We checked antenna header variables written in the FITS streams with AIPS. AIPS interprets them correctly.
      3We may need CASA/NRAO to adapt SMA table for Tsys and implement/adapt SMA specific frequency-weighting parameters or mechanisms in various calibration/imaging program routines of CASA.