VEGAS Pulsar Project Meeting: 2015 March 16th 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

FORD, JOHN 0.10
MCCULLOUGH, RANDY 0.25
RAY, JASON 0.25
BLOSS, MARTY 0.1
BRANDT, JOE 0.2
CREAGER, RAY 0.8
MELLO, MELINDA 0.1
RICHMOND DECKER, JUSTIN 0.5
BATES, SAM 0.25
DEMOREST, PAUL 0.25
PRESTAGE, RICHARD 0.1

  • Some of the electronics group intern Arindam Sengupta, to share tasks with Randy and Jason.

Present

  • ??

Agenda

General Updates

  • New BOF files
    • Status and summary page
      • Need to add "Priority" column
    • Status of Xilinx v4.16 testing?
    • Status of bug in fft block?
  • Config tool: VEGAS pulsar specific keywords and dual GUPPI/VEGAS modes
    • Richard and Ryan still need to review and make sure no outstanding questions
  • Manager
    • Ryan and Justin discussed and clarified some parameters
    • Justin estimates ~1--2 months to update Manager
  • C-Band tests
    • Is timescale for Manager short enough to wait on this?

Discussion

  • TOA periodicities in DIBAS BOF files
    • No sign of periodicities in Paul's test data from last year
    • No sign of periodicities in longer scans
    • Sam saw periodicities in coherent modes but at different frequencies
    • Ryan saw periodicities at same frequencies using a much different frequency for the AP
    • Jason believes the 10 MHz reference and 1 PPS are OK
    • Ryan, Sam, Jason, and Ray tested VEGAS hardware
      • Brief test showed periodicity at expected frequency
      • Seems to build up as more data added (expected) but possibly increases suddenly (see plots below)
    • Will try to test with GUPPI hardware

TOA periodicities from DIBAS BOF files

* Plots from VEGAS hardware tests below * 60-s scan lengths * Periodogram for first 50 scans
first50 periodogram.png
  • Periodogram for first 51 scans
first51 periodogram.png
  • Periodogram for all scans
all periodogram.png
  • Power at 466 s period (average of 3 nearest bins)
periodogram power trend.png

Date / Time of Next Meeting

  • ??

-- RyanLynch - 2015-03-30
Topic attachments
I Attachment Action Size Date Who Comment
all_periodogram.pngpng all_periodogram.png manage 61 K 2015-03-30 - 11:13 RyanLynch  
first50_periodogram.pngpng first50_periodogram.png manage 66 K 2015-03-30 - 11:11 RyanLynch  
first51_periodogram.pngpng first51_periodogram.png manage 66 K 2015-03-30 - 11:12 RyanLynch  
periodogram_power_trend.pngpng periodogram_power_trend.png manage 35 K 2015-03-30 - 11:10 RyanLynch  
Topic revision: r1 - 2015-03-30, RyanLynch
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