pipeline.hifa.cli.hifa_polcal

hifa_polcal(vis=None, minpacov=None, solint_chavg=None, vs_stats=None, vs_thresh=None) → PolcalResults[source]

Derive instrumental polarization calibration for ALMA.

Derive the instrumental polarization calibrations for ALMA using the polarization calibrators.

Parameters:

  • vis --

    The list of input MeasurementSets. Defaults to the list of MeasurementSets specified in the pipeline context.

    Example: ['M32A.ms', 'M32B.ms']

  • minpacov --

    Minimum Parallactic Angle Coverage (degrees) required for Q, U estimation in task polfromgain. This enables avoiding pathological cases of antennas with insufficient parallactic angle coverage which can yield spurious source polarization solutions or cause polfromgain to fail to find any solutions.

    Default: 30.0

  • solint_chavg --

    Channel averaging to include in solint for gaincal steps producing cross-hand delay, cross-hand phase, and leakage (D-terms) solutions.

    Default: '5MHz'

  • vs_stats --

    List of visstat statistics to use for diagnostic comparison between the concatenated session MS and individual MSes in that session after applying polarization calibration tables.

    Default: ['min','max','mean']

  • vs_thresh --

    Threshold to use in diagnostic comparison of visstat statistics; relative differences larger than this threshold are reported in the CASA log.

    Default: 1e-3

Returns:

The results object for the pipeline task is returned.

Examples

  1. Compute the polarization calibrations:

>>> hifa_polcal()