VEGAS Pulsar Project Meeting: 2015 April 20th 2:00 - 3:00pm ET

Room / Connection Details

  • GB-137 / Soc 280
  • 192.33.117.12##7144
  • 434-817-6443

Housekeeping Details

  • Main wiki page
  • gbsapp Mailing List
  • Location and regular date and time of meeting - agreed weekly on Mondays; GB-137 / Soc-280; 2-3pm ET
  • ETK codes:
    • Electronics: 432510.GB3015
    • Software: 893252.GB3015
    • Science: 432540.GB3015

Resource Allocations

GUPITA, ARINDAM 1.00
FORD, JOHN 0.10
MCCULLOUGH, RANDY 0.40
RAY, JASON 0.55
BLOSS, MARTY 0.05
CREAGER, RAY 0.8
RICHMOND DECKER, JUSTIN 0.0
LYNCH, RYAN 0.25
DEMOREST, PAUL 0.25
PRESTAGE, RICHARD 0.1

Present

  • Arindam, Jason, Randy, Richard, Justin, Paul, Scott, Ryan

Agenda

General Updates

  • New BOF files
    • Status and summary page
    • Early tests revealed a different device name for 10 GbE blocks
      • Difference in CASPER naming convention conflicted with Manager
      • We decided to make the Manager compatible with the new name(s) rather than change the block names
      • Arindam and Justin to confer to make sure there are no other conflicts
    • Length of frame-count in the packet header has been increased from 32 to 56 bits to support longer run times
    • Fixed a bad data type for scales in coherent mode
    • Rebuilding existing bofs and will continue tests this week
  • Manager
    • Ran into some unexpected problems, still trying to get guppi_daq_server to work with manager
      • Justin seeing issues with packets being sent/received. Will contact Paul to talk about tools for packet inspection.
    • Justin will talk to Jason about adc calibration (Arindam is adding appropriate snap blocks to designs)
    • Timeline slipped a bit but still hope to complete Manager in < 1 month.

Discussion

  • TOA periodicities in DIBAS BOF files
    • No significant periodicities detected with GUPPI
beef periodicity tests.png
    • VEGAS tests not conclusive; high FAP and low significance
vegas periodicity tests.png
    • Decided to switch valon on srbs
      • Other ideas to try: inject a test-tone instead of artificial pulsar, swap srbs hardware with that from unused VEGAS banks, plug srbs into the same 1PPS as GUPPI
      • UPDATE: Early tests with a new valon on srbs seem to have cleared this up. Ryan is confirming with more extensive tests.
  • srbs tests and schedule
    • Currently being used for Manager and bof file tests
    • bof file tests ideally need many hours of continuous testing
    • We will probably plug AP into unused VEGAS banks and use those for testing to avoid conflicts, but we want to try solving the periodicity issue first.

Date / Time of Next Meeting

  • April 27 if necessary, otherwise May 4

-- RyanLynch - 2015-03-30

This topic: CICADA > VegasPulsarModes > VegasPulsarProjectMeetings > VegasPulsarProjectMeeting2015Apr20
Topic revision: 2015-04-21, RyanLynch
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