CASA/JIVE VLBI Coordination Meeting

2021 Sep 29 @ 1400UTC


  • Future Meeting dates (usually last Wed of the month):
    • 2021 Oct 27 @ 1400 UTC
    • 2021 Nov 17 (one week early, to avoid USA Thanksgiving?)
    • 2021 Dec 15 (two weeks early, to avoid holidays?)

General Admin

  • General Status w.r.t. Coronavirus measures
    • NRAO/ALMA:
      • NRAO in North America now officially fully-vaccinated and "back to work", with masking/SD protocols still in place.
      • ALMA Santiago offices now open to staff on voluntary attendance basis; OSF/AOS staffing continues to increase based on careful review. Cycle 9 observing starts Oct 1.
      • Science/computing staff continuing work-at-home for now?
  • CASA Release Schedule
    • CASA 6.4.0: October (possibly for PL integration for ALMA Cycle 9?)
    • CASA 6.2.1: Patch release on Sep 27 for ALMA Cycle 8
    • CASA 6.3.0: Released Aug 30 (early!)
    • Release version OS/python matrix (from Ryan)
  • (Justin) Stakeholder prioritization
    • CASA 6.5 prioritization underway, due to Justin by Oct 11
    • CASA 6.5 development work to formally begin ~March 2022
  • Documentation and related
    • (Mark) Collated requirements (2021 July 02) ...status?
    • (Des/George) Fringefit memo...status? (TBD: George to add some general calibration context)
    • (Justin) VLBA CASA Recipe circulated; comments solicited/receieved
    • (Ilse) CASA VLBI Paper planning? (E.g, to follow general CASA paper Bjorn is organizing?)
  • CASA repo/build logistics
    • (Ryan/George) CASA repo re-org for sunset of CASA 5 (CAS-13461)
    • Building c++ unit tests in CASA 6 from Darrell (CAS-13461) (still some issues with google tests?)
    • VLBI Integration Branch: CAS-13295
    • casa6 build instructions via vmware (from Ville)
  • Misc. Admin
    • (Ryan) Revised CASA Management Plan (2021 August 30)
    • (Ryan) Recruitment process for new VLBI developer underway
  • (Ryan) CNGI/ngCASA Status?
  • Meetings/workshops of relevance
    • CASA Users Committee: Oct 11-14, including VLBI summary
    • ADASS: Oct 24-28
  • Other admin?
    • (Mark) Helpdesk recap


  • CASA 6.3+6.4 prioritization complete
  • Ongoing maintenance/development CASA 6.3/6.4 JIRA (VLBI) Status
    • Finished:
      • (Mark, CAS-13466) AveragingTvi2 preavg opt-out for fringefit: Merged to 6.3.
      • (Neal, CAS-13005) Handle refant exhaustion better. Merged to 6.3
    • Ongoing for 6.4.x
      • (Des, CAS-13224) memory management improvements in fringefit.
        • Re-validation complete, ready for PR.
      • (George, CAS-12735; 12765,12553; 12954,10276) Frequency meta-info
        • In validation @NAASC (CAS-12735,12954,10276) for 6.4.0.
        • (Des, CAS-13623, 12765,12553) Finalization of VLBI deployment in progress
      • (Mark, CAS-13266) Per-scan interpolation via overloading per-obs mechanism. (6.4.1)
        • (George) Semantics of "Time Segment" granularity to be generalized by George, to avoid internal confusions.
    • Underway for 6.4.1
      • (Des, CAS-13361) Polarization combination for fringefit.
        • Des/George converging on approach via a TVI layer (cf frequency averaging)
      • (Des, CAS-13056) Overlapping solution intervals
        • Initial implementation awaiting review by George
      • (Mark, CAS-13003). EOP update (6.4).
        • Investigating using almacalc with Python interface.
    • Other/Miscellaneous
      • (Mark, CAS-13622) FITS-IDI filler does not always update OBSERVATION table correctly
        • Affects fetching of TEC maps for EVN data; fix and tests ready
      • (Mark) Dysco ("lossy" compression of MeasurementSets, no ticket yet)
        • Integrated in casacore now; needs one-line diff in CASA to enable
      • (George/Justin) to coordinate initial testing on CASR-463 (TEC) to better characterize basic requirements
        • (Justin) Initial tests of VLA-focused implementation with VLBA data work mechanically, mostly; line-of-sight TEC appears broadly consistent with AIPS dispersive delay, but quantitative details need attention, including behavior near/at/below horizon
      • (George, CAS-13287) AveragingTvi2 problems for certain conditions; under separate investigation (cf CAS-13466)
      • CAS-12485: OTF weight munging for solve (Can we complete validation and deploy? Des seeking interested users at JIVE)


  • ?

-- GeorgeMoellenbrock - 2021-09-27

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Topic revision: r5 - 2021-09-29, MarkKettenis
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