VEGAS Pulsar Project Meeting: 2015 February 27th 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

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

Present

• Ryan, Paul, Marty, Arindam, Jason, Randy, Mark

Agenda

Simulator Testing

• Ryan and Paul have had good success with Simulator testing (see plots at the bottom of this page). There appears to be a ~ 474 sec periodicity in the residuals for the "start/stop" mode, for both coherent and incoherent modes. This was still present with a randomized period. Note added after meeting This was not seen in similar DIBAS tests, so something must be different.
• Overall tests went well, and it will be easy to automate the process. Ryan and Paul estimate ~ 24 hours elapsed time to run the tests, and less than an hour to prepare for them and process the results (assuming no problems are encountered).
• For the wider bandwidth modes, non-lustre disk write speed will become a problem. These final modes can probably be tested with the VEGAS hardware.

Other items

• Paul noted it would be good to have a broad-band noise source. This is under development as a WVU senior design project, under Randy's guidance.
• We agreed that we want the switching signal driver firmware included in the BOFs, but the switching signal state does not need to be encoded in the output packets.
• Justin has started work on the Manager MR.
• Arindam is starting to look at the high channel number modes.
• MMCM and other ADC calibration will be required. Since this is BOF and sampling frequency specific, each pulsar mode (or family of modes) will need to be calibrated.

Date / Time of Next Meeting

• Next meeting Monday 9th March at 2pm ET

Plots from DIBAS bof file tests with artificial pulsar

• Incoherent mode, 1024 channels, 1500 MHz, 256 bins, 60 s integration, 10 s dump-time, AP freq=300 Hz
• Incoherent mode, 1024 channels, 1500 MHz, 256 bins, 8 hr integration, 60 s dump-time, AP freq=300 Hz
• Incoherent mode, 1024 channels, 1500 MHz, 256 bins, 600 s integration, 10 s dump-time, AP freq=300 Hz
• Incoherent mode, 1024 channels, 1500 MHz, 256 bins, 60 s integration, 10 s dump-time, AP freq=301.23456 Hz
• Coherent mode, 512 channels, 800 MHz, 2048 bins, 60 s integration, 10 s dump-time, AP freq=300 Hz
• Coherent mode, 512 channels, 800 MHz, 2048 bins, 8 hr integration, 10 s dump-time, AP freq=300 Hz