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Checklist for ALMA optimized imaging workflow:

  1. DA is notified by the Operations Manager when there is a new image dataset to review, through a [NADR or SRDP] ticket (Ops Manger will receive notification via a script written by SSA).
  2. In the pilot, only channel widths and ranges can be set, so QA should be focused on those, along with general QA issues:
    1. Was the restoration of the calibration successful?
    2. Does the cube as made cover the region of interest requested by the PI (in the PPR)? If large parts of the cube are blank, and/or a line is cut off at the edge of the cube the DA should consult with a scientist.
    3. Does the rms noise in a line-free channel match the theoretical estimate from the pipeline (to within 10% above the theoretical estimate for bands 3-6, 15% for bands 7-8 and 20% for bands 9-10; but is no more than 20% better than the estimate)? If outside these ranges, DA should perform a limited investigation:
      1. In cases of dynamic range limits, is the dynamic range >200 (50 for 7m data)? If so the product may be marked as a QA pass, but the DA should note in the QA report that the user should attempt self-calibration.
      2. If there is bad target data, the DA should flag the bad data and rerun the PPR using the pipeline rerun script supplied by SSA.
      3. If neither of these is the case, or the RMS is more than 20% below the theoretical estimate, the DA should consult a scientist, and the data may be marked as QA fail (In the case of QA fail, products would not be ingested into the archive.)
    4. Are there artifacts in the image suggesting that target flagging is needed? If so, flag the data and rerun the PPR using the pipeline rerun script supplied by SSA.
    5. Is the continuum subtraction satisfactory? If not, DA should pick a new continuum range and rerun, or consult with an SRDP Scientist if it is not clear how best to do this.
    6. Is the synthesized beam highly elliptical? (Axial ratio > 3:1). If so, check that this is not due to heavy flagging of the target. If flagging is the cause (and not the observing HA and Dec),  consult with a scientist as to whether or not the job should fail QA.
    7. Is the synthesized beam sufficiently well-sampled (>3 pixels across the minor axis)? If not, DA should rerun with a smaller pixel scale (and image size in pixels adjusted to image the same area) using the pipeline rerun script supplied by SSA.
  3. Update the Google Spreadsheet with the QA state https://docs.google.com/spreadsheets/d/1USJ5rQRNbR3ORj80-UuEuqGnSYm4l6h_A6ac5s1FyJ0/edit#gid=0
  4. Write a short QA report suitable for transmission to the user:
    • Note any target flagging.
    • Note any change to the continuum range(s).
    • Note final QA decision - if a fail, briefly give reason.
    • Add any other comments (e.g. if self calibration is recommended).
  5. Initiate archive ingest of image products if they passed QA using the archive ingest script supplied by SSA. Include the QA report and ensure that the flagtargetstemplate.txt file is also archived if one was made or modified.
  6. Run cleanup script (supplied by SSA) to remove pipeline run after data ingested successfully into the archive.
  7. Email user via the helpdesk with the description of the QA on their products from step (4), and how to obtain them from the archive.
  8. Set the [NADR or SRDP] ticket to "resolved".

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