Meeting-3-22-2018

March 8, 2018 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. CDC settings for the rest of the run
   1. Results from the CDC threshold scan run 41611 to 41614 (CDC hardware threshold 90, 110, 120, 140)
      1. normalized rho yields at TH=120 increase by 4.3%, at TH=140 increase by 5.8%. Since these are different runs the data was normalized to the PS-flux
      2. the rho yields seem to scale linearly with CDC hardware threshold.
      3. CDC software threshold scan using run 41611 with hardware threshold at 90. First 3 files of the run are analyzed, same data so no normalization necessary. At 110 a rho yield increase of 3.3% is seen, at 140 a rho yield increase of 3.7% is seen, at 150 a rho yield increase of 3.4% is seen, at 160 a rho yield increase of 2.7% is seen.
      4. the rho yields do not scale linearly with software threshold! They saturate at about 140 (same as the highest hardware threshold)
      5. the software threshold of 140 leads to a rho yield increase of 3.7% while the hardware threshold of 140 to about 5.8%, this may be an indication that there is some shadowing effect.
      6. run 41614 with hardware threshold at 140, an increase of the software threshold from 150 to 160 does not increase the rho yield at a measurable level.
      7. see logbook entry: https://logbooks.jlab.org/entry/3544993
2. Other