VEGAS Team Meeting

Dial in Number: 877-937-8961

Passcode: 9445091#

Attendees: Mark, Richard, Ray, Randy, Adam, John, Amanda, Sam, Mark, Paul, Anish, Marty, Jason

Agenda:

Whole group:

  1. Status of BOFs for Modes 2 and 3 (H16k)
  2. "top hat" problem

GB only

  1. Review of "known problems" from: https://safe.nrao.edu/wiki/bin/view/CICADA/VegasStatusUpdate
  2. Agree to put off Mode 10-19 tests until Joe returns
  3. Status of commissioning memo
  4. DIBAS upgrade plans / assistance
  5. Plans for test time

Meeting notes:

Whole group:

  1. Status of BOFs for Modes 2 and 3 (H16k)
    • Hong is performing a fresh compile of the BOF along with the FFT instead of use pre-compliled FFT
  2. "top hat" problem
    • On occasion there are spectra with the middle section of spectrum flat-topped
    • Seems to be confined to the LBW-modes
      • Middle 1024 channels filled and others are not so normalized thus the filled channels get clipped
      • Seen some correlation between manger restarts and clearing the problems
    • Moving to another mode which would reloads BOF might show some information
    • Ability to selectively restart parts of the manager (a change) would help narrow down the cause.
    • move to GB-Only going forward

GB only

  1. Review of "known problems" from: https://safe.nrao.edu/wiki/bin/view/CICADA/VegasStatusUpdate
    • High Tsys in first integration
      • GPU modes are the ones with this problem (Jay reported #23)
      • Seems to be problems with exposure time calculation in HPC for first integration
      • Joe needs to look at code
  2. Agree to put off Mode 10-19 tests until Joe returns
    • Agreed
  3. Status of commissioning memo
    • Adam Sam & Richard are looking through test data via IDL and while there have been no obvious issues, need to solve remaining IDL in intricacies.
    • Need to rerun ripple tests - Amanda to data process?
    • Engineering tests need Anish, maybe in GB.
    • Deadline for delivery mod-August
  4. DIBAS upgrade plans / assistance
    • John is working with SHAO on getting the environment settled. John can help with FPGA, but need software assistance (Ray & Joe)
    • Will send them SDD direct contact information for Ray & Paul depending on area of system that needs support, Richard to send information.
      • Paul & Joe will not be available until next week and mid August respectively.
    • need to send them DIBAS models
  5. Plans for test time
    • Unscheduled request(s): Demo/training [Richard/Alyson]
    • Tuesday
    • Wednesday
    • Thursday
    • Monday (8/4)
      • None at this time

Other

  1. Please make sure to properly code your timesheets for the current time period and going forward.
    • Software engineers should be using a GBT ops software CM&E account - Account 893252
    • Electronic engineers should be using a GBT ops electronics CM&E account - Account 432510
    • Commissioning activities should be getting charged to hardware support and testing - Account 432510
    • Scientists assisting with shared-risk commissioning should be charging an observer support account
      • 432540 for the most part. Accounts 142020 (GB-based staff) and 142010 (CV-based staff) for when you are helping with overarching observing support (not problem solving, VEGAS specific)

-- MartyBloss - 2014-07-28
Topic revision: r1 - 2014-08-04, MartyBloss
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