FADC Data Format October 1, 2014

From GlueXWiki
Jump to: navigation, search

Location and Time

Room: CC F326-327

Time: 2:00pm-3:00pm

Remote Connection

(if problems, call phone in conference room: 757-269-6460)

  1. To join via Polycom room system go to the IP Address: 199.48.152.152 (bjn.vc) and enter the meeting ID: 589693655.
  2. To join via a Web Browser, go to the page [1] https://bluejeans.com/589693655.
  3. To join via phone, use one of the following numbers and the Conference ID: 462136260
    • US or Canada: +1 408 740 7256 or
    • US or Canada: +1 888 240 2560
  4. More information on connecting to bluejeans is available.

Agenda


Useful Links

Minutes

Present: Naomi, David, Beni, Cody, Lubomir

  1. FADC125 status
    1. Cody has the new timing algorithm working in simulation, now needs to merge this with the current version of fa250-like firmware.
    2. There have been a few issues in getting used to the fa250 firmware modes and understanding its error conditions. Mode 7 (readout of pedestal, integral & time; no raw samples) is not available at present, it might be enabled in the firmware but not accessible through the present software version. Also Beni has encountered some problems with readout where some modules do not have the data ready at the block ready check, but output it with the data for the next event instead.
    3. For the upcoming run in October we would like:
      1. readout mode 7 enabled
      2. the pedestal region to be increased from 4 to 16 samples
      3. the peak searching to start with the sample following the pedestal region
      • Cody will work on implementing these requests (in the order given above) and decide, based on progress by Monday afternoon, which of these modifications will be in the firmware used for the run.
  2. Readout of integration period, fa125 firmware
    1. We need to subtract the pedestal from the integration offline (not on the flash) to prevent negative integrals from being calculated. Pedestal throughout the hit signal is assumed to be constant, at the level just before the hit signal. If a fairly small signal is encountered sitting on top of a falling pedestal (eg the tail of the previous pulse) then the pedestal subtracted would be over-large and could result in a negative result, which would then be misinterpreted as positive.
    2. In order to subtract the pedestal offline we probably need to read out the number of samples included in the pulse integral, or the difference between the start of the pulse integral and the hit time.
Retrieved from "https://halldweb.jlab.org/wiki/index.php?title=FADC_Data_Format_October_1,_2014&oldid=80406"