VEGAS Pulsar Project Meeting: 2015 June 22nd 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

  • Marty, Ryan, Ray, John, Richard, Justin, Arindam, Dave MacMahon, Jack Hickish

Agenda

General Updates

  • BOF Files
    • Timing issues in 1500 MHz modes * Arindam sat down with Jack and Dave and tried manually placing blocks to achieve timing. New floor plan currently being tested. If it returns no timing errors Arindam will proceed with builds.
  • Manager/software
    • Ryan and Justin did extensive tests with Manager and grail set up last week
      • Data look good but we found some situations where scans failed.
        • Bank managers seemed to get into some weird states when running two banks. Parameters from one were apparently being sent to another. Multiple prepare statements and a manually turning off one bank seemed to fix this but it will complicate testing with two machines.
        • There were instances when the wrong bof/DD mode was being loaded. Unable to recreate.
        • When running multiple scans in a loop, data stopped being written after 4 scans with STR(?) errors
        • Ray recommends checking configurations and using a more robust method to detect scan stops and restarts. Also should keep an eye on guppi_daq to make sure the problem isn't there. * Roach crashes * Justin and Ray will make sure that the proper procedure is being followed whenever valon frequency is set. Namely, totally unload bof, make valon changes, reload bof * Dave asked if MMCM calibration is being done to make sure clock and data packets are aligned * Justin thinks this should be inherited by Backend.py base class, but will double check with Ray to make sure * Justin has written up some documentation * Ray and Joe will give a lunch talk next week on the new Matrix framework
  • Periodicity tests
    • Ray passed along repo information to Paul to patch guppi_daq
  • Test setup
  • New wideband AP
  • Resource allocations for Q4
    • Should be announced soon

Discussion

  • Richard thinks that the VEGAS "bump" artifact caused by the interleaved ADC's will be visible in pulsar bandpass
    • Size of the "bump" should be small unless the on/off continuum calibrator scans differ by a substantial fraction of Tsys
    • Should only be ~1 MHz wide
    • Ryan doesn't think this will have a significant impact, except for wide band flux density calibration

Date / Time of Next Meeting

  • July 6 (no meeting next week)

-- RyanLynch - 2015-07-15

This topic: CICADA > VegasPulsarModes > VegasPulsarProjectMeetings > VegasPulsarProjectMeeting2015Jun22
Topic revision: 2015-06-22, RyanLynch
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