Difference between revisions of "GlueX Start Counter Meeting, June 15, 2017"

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GlueX Start Counter Meeting<br>
 
GlueX Start Counter Meeting<br>
 
Thursday, June 15, 2017<br>
 
Thursday, June 15, 2017<br>
11:00 am EDT<br>
+
11:30 am EDT<br>
 
CEBAF Center, Room F326/327
 
CEBAF Center, Room F326/327
  
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#* [https://github.com/pooser/st-nim-article Start Counter NIM Article Git Repo]
 
#* [https://github.com/pooser/st-nim-article Start Counter NIM Article Git Repo]
 
#* [https://github.com/pooser/st-nim-article/blob/master/st_nim_article.pdf Current NIM PDF]
 
#* [https://github.com/pooser/st-nim-article/blob/master/st_nim_article.pdf Current NIM PDF]
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# Meeting time discussion
 
# Action Item Review
 
# Action Item Review
  
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Talks can be deposited in the directory <code>/group/halld/www/halldweb/html/talks/2017</code> on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2017/ .
 
Talks can be deposited in the directory <code>/group/halld/www/halldweb/html/talks/2017</code> on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2017/ .
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 +
== Minutes ==
 +
 +
Present:
 +
* '''FIU''':  Mahmoud Kamel
 +
* '''JLab''': Thomas Britton, Mark Ito (chair), Eric Pooser, Simon Taylor
 +
 +
There is a [https://bluejeans.com/s/niDbe/ recording of this meeting] on the [https://jlab.bluejeans.com/ BlueJeans site].
 +
 +
=== Calibration ===
 +
 +
* Mahmoud showed progress with determination of the counter attenuation lengths from data. He is currently having difficulties in having fits converge to the distributions of pulse area in various bins of position. Please see the recording for the plots. The data themselves looks good. There were various suggestions on how to get reliable convergence (e. g., removing pedestal noise peak completely from the fit region).
 +
* Mahmoud also showed updated efficiency measurements. See [https://halldweb.jlab.org/talks/2017/Data_Production_Analysis.pdf his slides] for the details. His efficiency has dropped compared to previous studies, but we think that that may be because the time cut he uses to identify accidental background includes a significant amount of signal, causing over-subtraction.
 +
* In the same set of slides he showed the projected intersection position of charged tracks with the start counter, for all sectors, in the r-z projection. The looser matching cut in the new software is manifest.

Latest revision as of 14:33, 20 June 2017

GlueX Start Counter Meeting
Thursday, June 15, 2017
11:30 am EDT
CEBAF Center, Room F326/327

Agenda

  1. Announcements
  2. Review minutes from the last meeting
  3. Calibration
  4. Time-dependent geometry adjustments
  5. Mcsmear procedure and parameters for the start counter
  6. NIM/TDR
  7. Meeting time discussion
  8. Action Item Review

Communication

BlueJeans

Slides

Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2017 on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2017/ .

Minutes

Present:

  • FIU: Mahmoud Kamel
  • JLab: Thomas Britton, Mark Ito (chair), Eric Pooser, Simon Taylor

There is a recording of this meeting on the BlueJeans site.

Calibration

  • Mahmoud showed progress with determination of the counter attenuation lengths from data. He is currently having difficulties in having fits converge to the distributions of pulse area in various bins of position. Please see the recording for the plots. The data themselves looks good. There were various suggestions on how to get reliable convergence (e. g., removing pedestal noise peak completely from the fit region).
  • Mahmoud also showed updated efficiency measurements. See his slides for the details. His efficiency has dropped compared to previous studies, but we think that that may be because the time cut he uses to identify accidental background includes a significant amount of signal, causing over-subtraction.
  • In the same set of slides he showed the projected intersection position of charged tracks with the start counter, for all sectors, in the r-z projection. The looser matching cut in the new software is manifest.