Difference between revisions of "Aug 11, 2015 Cal F250"

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##* Elton summarized a similar study as Mark's using pedestal data from R3281, but adding a simulated pulse. The general conclusions are similar as for Mark's study. However, this study also extended the window exploration to samples below crossing. It shows that for small pulses the minimum fractional width is indeed between about 2-12 counts (with threshold crossing sample=0). For larger pulses a similar minimum is reached, but there is also a broad minimum for starting before the crossing and integrating to beyond about 27 counts.
 
##* Elton summarized a similar study as Mark's using pedestal data from R3281, but adding a simulated pulse. The general conclusions are similar as for Mark's study. However, this study also extended the window exploration to samples below crossing. It shows that for small pulses the minimum fractional width is indeed between about 2-12 counts (with threshold crossing sample=0). For larger pulses a similar minimum is reached, but there is also a broad minimum for starting before the crossing and integrating to beyond about 27 counts.
 
## [https://logbooks.jlab.org/entry/3347605 Log Entry 3347605] Study of integration limits of FCAL signals
 
## [https://logbooks.jlab.org/entry/3347605 Log Entry 3347605] Study of integration limits of FCAL signals
 +
##* Matt summarized work by Manuel on the FCAL, studying an optimization similar to Mark's study (relative to the threshold crossing). The minimum width was found to be
 +
##* In addition, the fractional minimum width was studied as a function of the start of the widow from the peak value (instead of the peak).
 
# Computation of baseline (long-term) pedestal
 
# Computation of baseline (long-term) pedestal
 
#* Goal is to have a robust average of many samples, eliminating outliers that could affect the mean.
 
#* Goal is to have a robust average of many samples, eliminating outliers that could affect the mean.
 
# Any other business
 
# Any other business

Revision as of 11:03, 12 August 2015

Video Conferencing Information

Meeting Time:

  1. To join via a Web Browser, go to the page [1] https://bluejeans.com/907185247.
  2. To join via Polycom room system go to the IP Address: 199.48.152.152 (bjn.vc) and enter the meeting ID: 907185247.
  3. To join via phone, use one of the following numbers and the Conference ID: 907185247.
    • US or Canada: +1 408 740 7256 or
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  4. Upon connection all microphones are automatically muted. To unmute your mike on a Polycom or equivalent unit, enter *4. Unmuting on a computer is trivial as there is a microphone button than can be clicked.
  5. More information on connecting to bluejeans is available.

Participant Direct Lines

  • JLab Phone: in CC F326 is 757-269-6460 (usual room)
  • JLab Phone in CC L207 is 757-269-7084
  • Phone in the Regina Video-conference Suite is 306-585-4204

Action Items

List of issues:

  • Handling of pedestal subtraction for late pulses (leading to negative values)
  • Why is the overhead in the file size so large (content is about 20%)?

FA125's Useful Links

References

Tentative Agenda

  1. Announcements
  2. Action Items
  3. Updates
    1. Log Entry 3347898 Study of integration limits of BCAL signals
    2. Log Entry 3347605 Study of integration limits of FCAL signals
  4. Discussion
    1. Computation of baseline (long-term) pedestal
      • Goal is to have a robust average of many samples, eliminating outliers that could affect the mean.
  5. Any other business

Minutes

Attendees: Mark Ito, Manuel, Zisis (online); Mark Dalton, Elton, Matt, Beni, Sasha, Serguei (JLab);

  1. Announcements
  2. Action Items
  3. Updates
    1. Log Entry 3347898 Study of integration limits of BCAL signals
      • Mark Dalton summarized the work on determining the optimal start and end of the integration window using LED pulser data. The conclusion from this study is that integration between 2 and 13-17 samples after the threshold crossing gives the minimum width.
      • Mark Ito: Suggested that analysis of the window could determine the length of each pulse in the window and integrate samples within those samples. Elton: This would require to output the pulse length in the data stream for pedestal subtraction.
      • Mark Ito: Also stressed that variation in pulse shape (e.g. from scintillator response) could change the optimization.
      • Elton summarized a similar study as Mark's using pedestal data from R3281, but adding a simulated pulse. The general conclusions are similar as for Mark's study. However, this study also extended the window exploration to samples below crossing. It shows that for small pulses the minimum fractional width is indeed between about 2-12 counts (with threshold crossing sample=0). For larger pulses a similar minimum is reached, but there is also a broad minimum for starting before the crossing and integrating to beyond about 27 counts.
    2. Log Entry 3347605 Study of integration limits of FCAL signals
      • Matt summarized work by Manuel on the FCAL, studying an optimization similar to Mark's study (relative to the threshold crossing). The minimum width was found to be
      • In addition, the fractional minimum width was studied as a function of the start of the widow from the peak value (instead of the peak).
  4. Computation of baseline (long-term) pedestal
    • Goal is to have a robust average of many samples, eliminating outliers that could affect the mean.
  5. Any other business
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