Meeting Information

  • 1930 UT (1330 MDT)
  • AOC 317; IP:; phone: +1 575-835-7370



  • Good open house on Saturday (492 people attending)
  • Good weather and lots of high frequency data over the weekend * High Frequency: AS1013, AI139, AS1039, AT378, AD619, AB1347, AC974
    • Other: AU130, AV317, AS1039, AS1019
  • The EVLA/VLBA archive was down today from 1200-1230 MDT for disk array maintenance. Two disks failed over the weekend and were replaced.

Commissioning review/reports

Notes for week of 05 Apr 2010 (Black: old but still relevant; Blue: new)

  • Quick Software Systems review:
    • OPT (Lorant):
    • Executor (Barry): Changes and bug fixes (per Barry):
    • Scheduling (Joan, Bryan):
    • CASA (Juergen):
    • AIPS (Eric): REWAY task
  • Hardware notes

OSRO Priority Testing Status

System Verification

  • WIDAR update (Michael)
  • Array/Receivers
    • High Frequency Readiness
  • Anti-aliasing (Michael)

Band Checkouts (ECDATA-55)

  • L Band Status: Ready
    • Frequency labeling (ECDATA-9, ECDATA-10): Ok
    • Sky orientation (ECDATA-10): Ok
    • Gain stability (ECDATA-23): Ok; some bandpass phase evolution seen; follow-up on really blank sky.
    • Tuning: updated. 1860 interference identified. Okay to push new defaults into OPT (SSS is holding).
    • Antennas with no L-band: EA06, EA20, EA26
    • Integrating down (ECDATA-23):
      • Averaging in time is ok; averaging between subbands has problems.
      • L band (really) blank field (ECDATA-40)
    • L band, HI checkout (ECDATA-47); Juergen showed the results of using three tunings to enable adequate bandpass calibration. Will write up recommendation to be passed along.

  • S Band Status: Ready.
    • S band edge tests (similar result to C for tunings near 4 GHz; potentially some satellite downlink RFI; review of aliasing/out-of-band intermodulation is under review (Rick)
    • Frequency labeling (ECDATA-24): Ok
    • Sky orientation (ECDATA-18): Ok
    • Gain stability (ECDATA-24): Ok (no jumps seen)
    • Tuning (ECDATA-24): Reviewing default frequency based on birdies; recommendation to shift to multiple of 128 MHz .
    • Integrating down (ECDATA-18): Ok
    • Antennas with S band: EA08, EA09, EA15, EA22, EA24, EA27, EA28

  • C Status: Ready
    • Frequency labeling: Ok. Will get more information from Eric's analysis.
    • Sky orientation (ECDATA-35): Ok
    • Gain stability (ECDATA-35): Ok
    • Tuning: Low frequency tuning issue; stepped up for last AH1004.
    • Integrating down (ECDATA-25):
    • Antennas with no C-band: EA13

  • X Band Status: Ready
    • Frequency labeling : ECDATA-17): Ok
    • Sky orientation (ECDATA-17): Ok
    • Gain stability (ECDATA-26): Ok (no jumps)
    • Tuning: No issues
    • Integrating down (ECDATA-26): Ok
    • Antennas
    • RFI: none seen

  • Q Band Status: Ready.
    • Need Q band suite of tests.

Mode testing

  • Polarimetry Status:
    • C (ECDATA-12): Ready
    • L (ECDATA-42): Ready
    • Eric reviewing AH1004 data for AIPS
    • George will be pushing things into JIRA shortly; noted that he is seeing an East/West difference in the data, don't settle to the same value; good candidate for a more detailed discussion (e.g., ionospheric effects, etc).
    • *Rick noted that the design for L, S, and C cross bar will be much better balanced and should show lower cross polarization.
  • Spectral Line
    • Bandpass stability: ECSV-35
    • Bandpass tests: ECSV-92
      • Update from Jacqueline.
  • Wideband L (AB1345 - ) Sanjay

OSRO Proposal Testing (ECDATA-34)

  • AY 199 HI Run 2(ECDATA-123): Emmanuel
  • AS1012 (ECDATA-74): Juergen; in progress.
  • AU129 (ECDATA-77): Gustaaf; Several released.
  • AR704 - rerun
  • DEMO SCIENCE (ECDATA-88): James. Blocking filler issue.
  • AL733 (ECDATA-122, ECDATA-123): Miriam
  • AS1008 (ECDATA-120): Veronica
  • AR704 (ECDATA-123): Juergen
  • High frequency
    • AC980 (ECDATA-116, ECDATA-123): Manuel
    • AI139 (ECDATA-118): Maurilio
    • AW769 (ECDATA-124): Chris
    • AC974
    • AS1013
    • List of known problems (can be used by OSRO commissioning team (van Moorsel)
      • High Priority [Rupen]: X, Ku band subbands are inverted (IF 1 is labelled as IF4, IF2 as 3, IF3 as 2, IF 4 as 1). Noted that this had been tested but there were enough changes to warrant a re-do.
      • Med Priority [Butler]: Scan labeling synchronization.
      • Med Priority [Perley]: Issues integrating down when averaging by channel.
      • Med Priority [TBD]: Subband 0 problems: Being reviewed on Wednesday morning at the WIDAR meeting.
      • Med Priority [TBD]: Phase offsets within scans (phase jump at scan boundaries). R&L phase offset on some scans - probably L302 LO problem, needs tracking down. MR: Seen on EA07, EA25 (both RR and LL)
      • Med Priority [TBD]: Added. Phase change when frequency changes (needs to be tested).
      • Med Priority [TBD]: Anti-aliasing does not behave as advertised.
      • Low Priority [TBD]: Occasional zero-amplitude visibilities (needs software fix - what level). UVLOD and FITLD can handle this in AIPS; flagdata clip is effective in CASA; still need to understand and fix at the source.
      • Low Priority [TBD]: Occasional pure-noise scans.
      • Low Priority [Rupen/Pokorny]: Delay clunking; software fix pending.
      • Low Priority [TBD]: First scan often bad.
      • Low Priority [TBD]: Phase (and amp) wobbles; long history.

Commissioning plans for the week

System Tests

    • [Michael]: Enable multi-configuration SBs (with no hand-editing)
    • [Joan/Michael/Bryan]: Enable Dynamic Scheduling (diagnostics/debugging)
    • [Rick]: Enable RSRO Mode Observing
    • [Rupen; OSRO Priority 0]: OPT-> Archive path complete
    • OSRO-1 (256 MHz): Still need tests of polarization phase convention

OSRO project tests


  • Observations
  • Residents
    • Laura Chomiuk (POC: Miller Goss; area(s): Correlator checkout; Spectral line observing)
    • Adam Deller (POC: Bryan Butler; area(s): Correlator checkout)
    • James Miller-Jones (POC: Claire Chandler; area(s): Demo Science)
    • Jacqueline van Gorkom (POC: Miller Goss; area(s): Correlator checkout; Spectral line observing)
    • Manuel Aravena (POC: Chris Carilli); area(s): High frequency checkout (reference pointing tests)
    • Dave Green (arriving; POC: Sanjay Bhatnagar); area(s): Imaging

Demo Science

  • Summer school data plans: 3C391 continuum mosaic (C band)
  • Other projects discussion (Claire)

This week in JIRA

  • No new topics


  • [van Moorsel]: Outline OSRO observation checklist (all required steps in delivery of archive data to PI).
  • [Rupen]: Develop daily/post-maintenance day checklists for the system.
  • [McMullin]: Post Eric's AIPS Guide as template for reduction strategy. Working on how to format this; twiki not good for providing a polished look to users. Want to use mediawiki; discussions with CV ongoing, to be resolved today.
  • [McMullin]: Add ECSO Projects to JIRA/tracking.
  • [McMullin]: Review/recover metrics for Priority 0 items.
  • [Perley]: Description of guideline reduction steps in continuum processing.
  • [Perley/Dhawan]: Develop test to develop/demonstrate readiness for high frequency observing.
  • [Perley]: Develop set of frequency accuracy tests (X band is complete).
  • [Perley]: Perform a frequency sweep test at S band to provide to engineers for review (Q2).
  • [Benson]: Update when automated handling of multiple spectral windows is available (Q2). Clarified: John will organize a small group this week (likely necessary candidates are Eric, Michael, Rick) to resolve the near and long term plans for handling the automated export to UVFITS for heterogeneous spectral windows (e.g., auto split by spectral window, etc). Results to be presented next Monday.


Planning review (for Q1/Q2 2010):

Note: Beginnings of group pages from the organization page:

Followup deferred. Begin to look at the detailed needs for the tests being scoped out by the leads. Want to finalize the detailed observing/testing plans by the end of this month and have a view of the longer term commitments needed. Establish an overview of the obstacles to deploying to the community; in particular, understand all of the details of the end-to-end data flow/processing to make decisions on what is working versus what is usable by the community. Something like:

Mode OPT Scheduling Executor/Corr Calibration strategy Archive CASA AIPS Data Distribution Other Overall Status
Example limit of 1 s int ok OPT selected limits not possible no recommendations avail ok can't cook coffee weather table - transient issue no-go

  • Critical Commissioning
    • System Verification (Perley/Rupen): Need plan to conclude complex gain, bandpass stability tests at L-Q, reference pointing, gain curves, tipping scans.
    • Observing Band Checkout (principally calibration strategies, flagging)
    • Observing Mode Support (broad modes based on science goals)
    • Observing support (e2e capability)
      • OSRO Testing (Gustaaf); ECSV-18 - needs to be pushed into JIRA.
      • Flux Calibrator Models (Amy); ECSV-43
  • Advanced Science Support

    • Need:
      • [Butler] Planning: Planetary observing (OPT setup; correlator needs); ECSV-7, ECSV-15
      • [Chandler] Planning: Demo Science
      • [Frail] Planning: ToO scheduling heuristics
      • [Sjouwerman] Planning: OPT tests for primary frequencies; ECSV-6
      • [van Moorsel] Planning: Data distribution plan
      • [Sjouwerman] Planning: Archive functionality tests; ECSV-11
      • [Mioduszewski] Planning: Calibrator survey; ECSV-27
      • [Brisken] Planning: Phased array (VLBI, pulsars); ECSV-22, ECSV-23
      • [Golap] Planning CASA multi-thread/cluster testing.
      • [Walker] Planning VLBI setup

-- JosephMcMullin - 05 Apr 2010
Topic revision: r2 - 2010-04-05, jmcmulli
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