Minutes in bold.

CASA/JIVE VLBI Coordination Meeting

Attendance: George, Mark, Des, Ilse, Justin, Neal

2020 August 12 @ 1400UTC


  • Future Meeting dates (usually last Wed of the month):
    • 2020 Sep 30 @ 1400 UTC
    • 2020 Oct 28 @ 1400 UTC

General Admin

  • General Status w.r.t. Coronavirus measures
    • NRAO/ALMA:
      • NRAO in North America now in Phase 1 of "Return to Full Operations" from June 8,
        • RTFO Phase 2: Dec 1 (earliest) "Steady-state" in "New Normal", maybe some travel, F2F meetings; consider 2021+ according to conditions
      • ALMA has begun reviews considering restart of operations (currently "not yet")
      • Science/computing staff continuing work-at-home for now
  • CASA Release Schedule
    • CASA 5.7/6.1: Pre-release package branch July ~27; public release imminent...
    • CASA 5.8/6.2: Development ongoing. Nominal code freeze: mid/late September
  • JIRA workflow migration (simplification) complete
    • Some ticket states have evolved (no "sub-tasks")
    • Package build (CASA 6) triggering ("Package" field via ticket "Edit")
    • Refer any issues/problems to George
  • (Mark) Requirements collation status?
    • 2020 May 07 document
    • (George) Should complete re-numbering to better align with prioritization exercise from May 2020
    • (George, Justin) Need to forward Requirements Doc and prioritization to Jen Donovan-Meyer, as input to Stakeholder process for CASA 5.9/6.3
  • (Ryan) CNGI Status:
    • In lieu of aborted CoDR, CNGI Study Closeout process (2021+) being prepared, including: prototype demo package of basic flagging, calibration, & imaging; review of C++ code reuse prospects cf demos; concrete ngCASA specification project mapping ngVLA (and retrospective ALMA) requirements, and including a multi-year schedule, staffing plan, etc.
    • FYI: CNGI Development instructions
  • Pending admin issues
    • DIY casa5 tarball build instructions can be found here (Is this working Des?)
      • (Des) After discussions with Ville, more-or-less working; hopefully not needed much longer
    • casa6 build issues: formal instructions for plotms, CASAshell, casa5/6 co-exist, c++ unit tests in casa6
  • Upcoming meetings/workshops of relevance
    • CASA User Committee: 2020 Oct 20-23 (virtual)
    • JIVE VLBI Workshop 2020 Nov 2-6. Virtual, hopefully with an (off-site) in-person component.
      • ASTRON is closed for events, but offsite options (Hotel De Borken) internet-challenged, making virtual component difficult/impossible, exact plan still TBD
  • Other admin?


  • CASA 5.8/6.2:
    • JIRA Status
      • CAS-12736: accor test needs some VLBA data for proper test
        • 43 GHz dataset likely best-demonstrator; may be possible to re-use something from fringefit testing (Justin?)
          • (George, Justin, Neal) Coordinate identification of VLBA test dataset, and update test
          • (George) Continue diagnosis of old VLA dataset test failure
      • CAS-8537: gain curve:
        • Mark has working implementation
          • Merge of current casacore to casa trunk urgently needed (like several other general CASA developments), then easy to commit and PR/merge
        • Adaptations needed in concat, mstransform?
          • (Mark) Close w/ concat, will consider what might be needed for mstransform
          • In general, most users should be satisfied with ordinary (sometimes multi-file) importfitsidi fill, and this calibration established early in processing
        • Caltables use 16 parameters (8 per-pol), so a polynomial of degree 7.
        • How to integrate into gencal?
          • (George) Although transparent adaptation of existing mode desirable, adding new gencal mode probably easiest for isolating and managing required calculations on apply
      • (Mark) Polarization basis conversion
        • (Mark) To handle mixed basis EVN arrays, adapt Marti-Vidal code to "calibrate" (within CASA calibration infrastructure) to common (circular) basis via cross-hand gain (slight generalization of XJones) + basis conversion (as an ordered calibration term). For now, an experimental effort, orthogonal/non-distruptive to all else and under the radar; when ready to deploy, offer as a CASA task (with requisite testing, etc.)
      • Other:
        • George to study what is needed in plotms for fringefit (CASR-537; may not require significant effort from Pam)
        • George/Justin to coordinate initial testing on CASR-463 (TEC) to better characterize basic requirements (also CAS-13040 re TEC retrieval changes)


  • ?

-- GeorgeMoellenbrock - 2020-08-12
Topic revision: r1 - 2020-08-12, GeorgeMoellenbrock
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