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Agenda 240730

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Victor de Souza Magalhaes edited this page Jul 30, 2024 · 3 revisions

Participants

  • Jan-Willem Steeb
  • Josh Hoskins
  • Justo Antonio Gonzalez Villalba
  • Pedro Beaklini
  • Victor de Souza Magalhaes

Development

New realease, v0.5.0

  • General
    • Dropped support for python 3.8, prompted by drop of support for 3.8 in graphviper
    • Pixel coordinates now reflect the middle of the pixel rather than its left edge
    • U and V axes are now always in meters in data files rather than in kilo lambda
  • Combine
    • Fixed weighted combining of DDIs
  • Holog
    • Refactoring for better separation between beam gridding and aperture generation
    • Padding with zeros now produces images that have a size of 2^(ceiling(log2((original_size*padding_factor)))
    • image_mds.plot_apertures can now choose polarization state
    • image_mds.plot_beams plots are now split by polarization state
    • Beam gridding using a gaussian kernel
    • Bug fix: Calling holog with a grid_size and cell_size no longer overwrite these values in the input .holog.zarr file
  • Panel
    • Screw adjustments file now contains the method use to fit the panel and if it was a fallback
    • Polarization state selection with I being the default
  • ALMA Near field support (Alpha)
    • ALMA NF ASDM filler to the .holog.zarr format
    • Selection of ALMA OSF pad in holog to determine distance and defocusing
    • Beam apodization
    • Non-fresnel terms in aperture generation (Not fully correct)
    • Phase near field corrections (Not fully correct)
    • GILDAS\CLIC like phase fitting including astigmatism

ALMA Near Field Holographies

Astrohack now presents minimal support for ALMA near field holographies with support for:

  • Importing ALMA near field ASDMs to the astroahck native .holog.zarr format.
  • Processing of a near field .holog.zarr file with holog to produce beam images.

Support for the production of near field apertures is still in progress. Apertures produced with the current version are not to be used for panel adjustments.

Instructions on how to use Astrohack with ALMA near field holographies can be found here.

Actions

  • VSM will send the dataset and instructions on how to run astrohack to JAGV
  • VSM will determine points in the GILDAS\CLIC code to insert breakpoints to inspect data processing.

ngVLA support

ngVLA optics are more complex than previously assumed, we will need to compute complete light paths at perfect alignment from the primary to the focal point, so that we can compute translations between phase and deviation and so that we can compute the effects caused by the telescope being out of focus.

Next Meeting

  • August 13th 2024

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