Minutes in bold.

CASA/JIVE VLBI Coordination Meeting

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

2020 Dec 9 @ 1500UTC


  • Future Meeting dates (usually last Wed of the month):
    • 2021 Jan 20 @ 1500 UTC (a week earlier than nominal)
    • 2021 Feb 24?

General Admin

  • General Status w.r.t. Coronavirus measures
    • NRAO/ALMA:
      • NRAO in North America will continue to work@home for foreseeable future (well into 2021). Infections rates increasing across US; NM now worse than ever.
      • ALMA progressing with array restart plans, expected to take many months. Power to be restored to the high site Dec 10. Resume science observing in March 2021?
      • Science/computing staff continuing work-at-home for now
  • CASA Release Schedule
    • CASA 5.7/6.1: Has been released (2020 Aug 20). Patch releases pending:
      • CASA 6.1.1 for ALMA PL being exercised; working on a repeatability issue
      • CASA 6.1.2/5.7.2 w/ polcal and tec fixes (VLASS, ALMA) nearly ready.
    • CASA 5.8/6.2: Development ongoing.
      • Should be wrapping up development ~now
      • Validation in progress, will continue into January. Release ~early February.
      • Tickets reviewed below...
  • Requirements collation: 2020 May 07 document / VLBA Costing/Prioritization (2020 May 21)
    • (George) TBD: Complete re-numbering to better align with prioritization exercise from May 2020 (Still thought necessary?). Leave well enough alone, for now
    • (George, Justin) TBD: Need to forward Requirements Doc and prioritization to Jen Donovan-Meyer, as input to Stakeholder process for CASA 5.9/6.3. (see below)
  • (Ryan) CNGI/ngCASA Status:
  • Pending admin issues
    • DIY casa5 tarball build instructions can be found here
    • casa6 build issues: formal instructions for plotms, CASAshell, casa5/6 co-exist, c++ unit tests in casa6. (George has some recent experience with new workstation; will inform improved docs by Ville.)
  • Meetings/workshops of relevance
    • JIVE VLBI Workshop 2020 Nov 2-6. (virtual)
      • How did it go?
      • Ilse: Lectures went well, good feedback during/after, tutoring difficult remotely, Mattermost for chat, ~100 serious participants, ~45 hard-core; Amy Kimball very helpful; should collaborate w/ NRAO in future
      • Mark: Lectures worked well, interactive difficult, TEC seemed to work mechanically (probably some work needed on scientific veracity)
      • NB: (George, 2020/12/17) TEC caltable generation appears to be internally sensitive to antenna-based geography; the tec_maps script has some VLA-specificity that should be generalized.
    • Ilse giving CASA/VLBI talk at Radio Camera Initiative Seminar Dec 11 @ 1600 UTC
  • Other admin?
    • Harro needs atlassian access (cf Mark, Des, Ilse). (George has submitted a request)..... DONE (2020/12/09)


  • CASA 5.8/6.2:
    • JIRA (VLBI) Status
      • Notables:
      • (George) CAS-12735: Frequency meta-info (includes generalized fix for CAS-12553, and several other bug tickets)
        • Continued progress, been distracted by 6.1.1/6.1.2 in recent weeks. Committed to completing it!
      • (Des) CAS-12765 (wide-spaced spws): waiting for freq meta fix in CAS-12735
      • (Neal) CAS-13184): accor corrdepflags.
        • Assigned to Neal for verification blessing. Coordinated with CAS-12736 below.
      • (Mark) CAS-8537: gain curve. Now in validation. Need to ping Jen.
        • (Mark) Test of gaincurve to use small dataset recently obtained by Justin: TL015
        • (Mark) TL015 revealed some importfitsidi bugs fixed in casacore
        • Justin validating ~now.
        • Casacore update in CAS-8550 (which adds importfitsidi test that uses TL015)
      • (Neal) CAS-12736 (revised accor test) Neal updating verificaiton tests with TL015 (found same trouble as Mark on gaincurve)
      • (Mark) CAS-12989 (eMerlin crosshands) Validation complete (Anita Richards). Need hard-to-get eMerlin dataset for proper verification test....
      • (Pam Harris) CAS-11318: Fringe-fitting solution plotting (incl. dispersive term) has been implemented in plotms!
        • JIVE should have a look and validate for 5.8/6.2!
        • NB (2020/12/17): Actually, the dispersive term is not yet supported; Pam is going to have a look...
      • (CAS-13056, CAS-13003, and possibly CAS-13005 to slip to next cycle)
      • (Des) Memory leak in fringe-fitter? (from big EHT case by Janssen). Apparently not a leak, just a large memory case? Des continuing investigation (CAS-13224)
  • CASA 6.3 prioritization
    • Justin collating high-priority items (see email dated 2020 Nov 19).
    • Due January 8 for CASA planning process (there will be a confluence page and JIRA filter, etc.)
    • Justin to circulate condensed list ~next week; JIVE to add their (non-NRAO) isolated work items
    • NRAO/VLBA-specific portion to be evaluated/scheduled in January; Confluence pages and JIRA tickets to appear then also
  • Other development topics
    • (**Mark) Per-scan interpolation CAS-13266
      • Important for EHT
      • Co-opt per-obs to respond to scans seems a promising strategy
    • (Mark) Combine polarization in fringefit also important for EHT
    • (*Mark) AveragingTvi2 and FringeFitting CAS-13287
      • Meta-data problems when preavg < solint? nRows(!) in VB2 is wrong when baseline (antenna) population varies within solint
    • (*Des) NaNs in imported Tsys. *CAS-13270. (easy fix; ok for 5.8/6.2?)
    • CAS-12485: OTF weight munging for solve (Can we complete validation and deploy? Des seeking interested users at JIVE)
    • (Mark) VLBA pulsar binned data.... requires casacore fix to importfitsidi (PR pending, CAS- ticket pending). will be merged via gaincurve casacore changes
    • (Mark) Generalized polarization basis conversion
    • (George/Justin) to coordinate initial testing on CASR-463 (TEC) to better characterize basic requirements (also CAS-13040 re TEC retrieval changes)


  • n/a

-- GeorgeMoellenbrock - 2020-12-09
Topic revision: r3 - 2020-12-17, GeorgeMoellenbrock
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