Difference between revisions of "Minutes-8-11-2016"

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# Detector updates
 
# Detector updates
 
#* CDC update (Naomi/Mike/Beni)
 
#* CDC update (Naomi/Mike/Beni)
#** CDC thermocouple module switch (Naomi)
+
#** CDC thermocouple module switch (Naomi) [https://logbooks.jlab.org/entry/3412256 logbook entry]
 
#* FDC update (Simon/Lubomir/Alex)  
 
#* FDC update (Simon/Lubomir/Alex)  
 
#** Particle gun MC: momentum resolution comparison with/without using FDC drift times (Simon):
 
#** Particle gun MC: momentum resolution comparison with/without using FDC drift times (Simon):
 
#** [[File:dp_5deg_comp.gif]][[File:dp_p_10deg_comp.gif]]
 
#** [[File:dp_5deg_comp.gif]][[File:dp_p_10deg_comp.gif]]
 
#** RD: [https://halldweb.jlab.org/wiki/images/d/dc/FDC_Improvements.pdf Effect on Efficiency] (Alex A.)
 
#** RD: [https://halldweb.jlab.org/wiki/images/d/dc/FDC_Improvements.pdf Effect on Efficiency] (Alex A.)
#** CDC and FDC tracks with GENFIT examples: [http://www.jlab.org/Hall-D/detector/fdc/genfit/tr48_zy2.png track 48 zy], http://www.jlab.org/Hall-D/detector/fdc/genfit/tr48_xy.png track 48 xy], [http://www.jlab.org/Hall-D/detector/fdc/genfit/tr45_zy.png track 45 zy], http://www.jlab.org/Hall-D/detector/fdc/genfit/tr45_xy.png track 45 xy], [http://www.jlab.org/Hall-D/detector/fdc/genfit/tr42_zy.png track 42 zy], http://www.jlab.org/Hall-D/detector/fdc/genfit/tr42_xy.png track 42 xy] (Lubomir)
+
#** CDC and FDC tracks with GENFIT examples: [http://www.jlab.org/Hall-D/detector/fdc/genfit/tr48_zy2.png track 48 zy], [http://www.jlab.org/Hall-D/detector/fdc/genfit/tr48_xy.png track 48 xy], [http://www.jlab.org/Hall-D/detector/fdc/genfit/tr45_zy.png track 45 zy], [http://www.jlab.org/Hall-D/detector/fdc/genfit/tr45_xy.png track 45 xy], [http://www.jlab.org/Hall-D/detector/fdc/genfit/tr42_zy.png track 42 zy], [http://www.jlab.org/Hall-D/detector/fdc/genfit/tr42_xy.png track 42 xy] (Lubomir)
 
# NIM Papers
 
# NIM Papers
 
#* svn ls https://halldsvn.jlab.org/repos/trunk/publications/GlueXCDC
 
#* svn ls https://halldsvn.jlab.org/repos/trunk/publications/GlueXCDC
 
#* svn ls https://halldsvn.jlab.org/repos/trunk/publications/GlueXFDC
 
#* svn ls https://halldsvn.jlab.org/repos/trunk/publications/GlueXFDC
# fADC125 meeting (Naomi, Cody, Beni)
+
# fADC125 meeting (Naomi, Cody, Beni) [[FA125_chip_occupancy|fa125 occupancy (corrected)(Beni was right)]]
 
# Other
 
# Other
 
<!--
 
  
 
= Minutes =
 
= Minutes =
  
Participants: Sean (NU), Mike (CMU) Eugene, Cody, Luke, Beni, Alexander A., Simon, and Lubomir (JLab).
+
Participants: Sean (NU), Naomi, Curtis (CMU) Eugene, Chris, Luke, Beni, Alexander A., Simon, Sergey, and Lubomir (JLab).
  
 
== CDC ==
 
== CDC ==
  
- In the analyses meeting Mike reported already [https://halldweb.jlab.org/wiki/images/b/b5/MStaibCDCEfficiencyS16.pdf his studies] on the CDC efficiency.
+
- Naomi found a problem with the thermocouple that monitors the CDC temperature - see the log entry above.
  
- Beni: Nick and Chris are cleaning/replacing the CDC HVB that had some issues during the last run due to some dust on them. We discussed possible origins of this dust: coming from the cooling tubes, air, or sucked by the magnetic field. 
 
 
 
== FDC ==
 
== FDC ==
  
 +
- Simon used simulations to demonstrate the advantage of adding the drift time information to the FDC track reconstruction - momentum resolution improves by a factor of sqrt(2) at high momenta. At low momenta multiple scattering dominates - see plots above. Can't wait to see the same improvement with real data.
 +
 +
- Alex A. showed plots with improved FDC (pseudo)hit efficiency in two stages, now it is close to 90%.  When using the FDC drift time information there is a gap at small drift distances, probably these are excluded for the tracking?
 +
 
 +
- Lubomir showed tracks trough both CDC and FDC, taken from the CDC track hit objects (with the standard Hall D soft) and reconstructed with genfit. The feature that we don't understand is the fact that we often don't see hits in the CDC where we expect to have from extrapolating the FDC track to that region.
 +
 +
== fADC125 ==
  
-->
+
- Naomi studied the occupancy of the f125 chip by chip - see the above link for plots and tables. The chips with high occupancy in the FDC can be correlated with long strips just next to the beam, or noisy channels.

Latest revision as of 14:46, 31 August 2016

August 11, 2016 Drift Chamber meeting

Connection

  1. Instructions for Bluejeans meeting connection
  2. Meeting ID: 290664653

Headline text

  1. To join via a Web Browser, go to the page [1] https://bluejeans.com/290664653.

Agenda

  1. Detector updates
  2. NIM Papers
  3. fADC125 meeting (Naomi, Cody, Beni) fa125 occupancy (corrected)(Beni was right)
  4. Other

Minutes

Participants: Sean (NU), Naomi, Curtis (CMU) Eugene, Chris, Luke, Beni, Alexander A., Simon, Sergey, and Lubomir (JLab).

CDC

- Naomi found a problem with the thermocouple that monitors the CDC temperature - see the log entry above.

FDC

- Simon used simulations to demonstrate the advantage of adding the drift time information to the FDC track reconstruction - momentum resolution improves by a factor of sqrt(2) at high momenta. At low momenta multiple scattering dominates - see plots above. Can't wait to see the same improvement with real data.

- Alex A. showed plots with improved FDC (pseudo)hit efficiency in two stages, now it is close to 90%. When using the FDC drift time information there is a gap at small drift distances, probably these are excluded for the tracking?

- Lubomir showed tracks trough both CDC and FDC, taken from the CDC track hit objects (with the standard Hall D soft) and reconstructed with genfit. The feature that we don't understand is the fact that we often don't see hits in the CDC where we expect to have from extrapolating the FDC track to that region.

fADC125

- Naomi studied the occupancy of the f125 chip by chip - see the above link for plots and tables. The chips with high occupancy in the FDC can be correlated with long strips just next to the beam, or noisy channels.