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August 11, 2016 Drift Chamber meeting


  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.


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


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


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


- 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.


- 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.