September 14, 2011 Tracking CDC/FDC

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Meeting Time and Place

Wednesday September 14, 2011 at 11:00am At Jefferson Lab, the meeting will be held in F326

Connections

To connect from the outside, please use ESNET

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Agenda

  1. Announcements
  2. Collaboration Meeting
    1. CDC status talk
    2. FDC status talk
    3. Other talks? 125FADC?
  3. FDC Update logbook
  4. CDC Update
    1. Prototype results with cosmics

Drift time histogram (for all straws) and expanded about t0

Drift times
Drift times

T0 was taken as the x-intercept of a straight line fitted to the leading edge over 10% to 90% of the maximum value. Here (hit threshold=5sigma) this value is 91.3ns.
50/50 Ar/CO2 results at 2050V

49/51 Ar/CO2 gas mix 2050V Resolution vs fitted drift distance, hit thr=4sigma dt=10ns tfix=1ns
49/51 Ar/CO2 gas mix 2050V Resolution vs fitted drift distance, hit thr=4sigma dt=10ns tfix=1ns

50/50 Ar/CO2 results at 2100V

49/51 Ar/CO2 gas mix 2100V Resolution vs fitted drift distance, hit thr=4sigma dt=9ns tfix=0ns
49/51 Ar/CO2 gas mix 2100V Resolution vs fitted drift distance, hit thr=4sigma dt=9ns tfix=0ns

Looking for afterpulses at 2100V with cosmics:

Events at 2100V
Events at 2100V (zoom in on pedestal)

More details on Improved_timing

Minutes

Participants: Curtis, Naomi, Eugene, Beni, Simon, Dave, Lubomir, Elton, Mark, Tim

Collaboration meeting

In addition to the FDC and CDC construction status talks, Beni would like to make a presentation on the positioning of the FDC modules.

FDC Update

CDC Update

  1. Straw installation - the remaining Al components arrived and have been checked, cleaned and glued into straws. We expect to finish straw installation in the next few days. After that the CDC will be moved to its horizontal position ready to install the outer hubs and shell. The strips to make the outer hubs are now ready to be glued into the endplates.
  2. Remaining parts/manufacturing - we had a meeting with Tim and Slava last week to arrange who would purchase or make the remaining CDC parts.
  3. Naomi presented some recent results with the prototype using improved triggering for cosmics.
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