Difference between revisions of "July 28, 2015 Cal F250"

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* [[Media:FADC125 DataFormat v5 06.pdf]]
 
* [[Media:FADC125 DataFormat v5 06.pdf]]
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* [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=2752 GlueX-doc-2752 fADC250 Operational Characterization: Air Flow, Temperature and Pedestals]
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* [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=2752 GlueX-doc-2752 fADC250 Operational Characterization: Air Flow, Temperature and Pedestals]
  
 
= Tentative Agenda =
 
= Tentative Agenda =
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# Discussion of data formats  
 
# Discussion of data formats  
 
#* [https://mailman.jlab.org/pipermail/halld-cal/2015-July/date.html e-mail exchanges]
 
#* [https://mailman.jlab.org/pipermail/halld-cal/2015-July/date.html e-mail exchanges]
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# Any other business
  
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= Minutes =
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''Attending: Elton, Fernando, Beni
 +
 +
# Announcements
 +
# Action Items
 +
# [https://logbooks.jlab.org/entry/3346781 Log Entry 3346781] Estimates of peak: MC study of resolution (Elton)
 +
#* Conclusion from study is that there is no clear advantage to more complicated algorithms for determining the peak compared to using the maximum sample
 +
# [https://logbooks.jlab.org/entry/3346042 Log Entry 3346042] Correlation coefficients between samples (Elton)
 +
#* The correlation between samples prevent the resolution using many samples from scaling as 1/sqrt(N). The resolution flattens off at about 0.4 counts.
 +
# [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=2781 GlueX-doc-2781] (Fernando)
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#* Fernando explored detailed algorithms which could be implemented in firmware
 +
#* Conclusion is that integer averages are to be avoided and the resolution also plateaus at about 0.4 counts.
 +
# Discussion of data formats
 +
#* [https://mailman.jlab.org/pipermail/halld-cal/2015-July/date.html e-mail exchanges]
 
{| border = 1
 
{| border = 1
 
|+ Number of pulses for two options
 
|+ Number of pulses for two options
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| 3 || 7 || 9 || 7 || 6 || 4 || 9
 
| 3 || 7 || 9 || 7 || 6 || 4 || 9
 
|}
 
|}
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#* Pros and cons discussed.
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#* Beni: Note that the fine time determination is less useful for very fast signals, such as those in the tagger.
 
# Any other business
 
# Any other business
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−
= Minutes =
 
−
 
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''Attendees:
 

Latest revision as of 17:13, 24 February 2017

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
    • US or Canada: +1 888 240 2560
  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. Log Entry 3346781 Estimates of peak: MC study of resolution (Elton)
  4. Log Entry 3346042 Correlation coefficients between samples (Elton)
  5. Discussion of data formats
  6. Any other business

Minutes

Attending: Elton, Fernando, Beni

  1. Announcements
  2. Action Items
  3. Log Entry 3346781 Estimates of peak: MC study of resolution (Elton)
    • Conclusion from study is that there is no clear advantage to more complicated algorithms for determining the peak compared to using the maximum sample
  4. Log Entry 3346042 Correlation coefficients between samples (Elton)
    • The correlation between samples prevent the resolution using many samples from scaling as 1/sqrt(N). The resolution flattens off at about 0.4 counts.
  5. GlueX-doc-2781 (Fernando)
    • Fernando explored detailed algorithms which could be implemented in firmware
    • Conclusion is that integer averages are to be avoided and the resolution also plateaus at about 0.4 counts.
  6. Discussion of data formats
Number of pulses for two options
No Pulses Full S Full E No Ped S No Ped E No Time S No Time E
1 3 3 3 2 2 3
2 5 6 5 4 3 6
3 7 9 7 6 4 9
    • Pros and cons discussed.
    • Beni: Note that the fine time determination is less useful for very fast signals, such as those in the tagger.
  2. Any other business
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