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September 28, 2017 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]


  1. Collaboration meeting agenda
  2. CDC update
  3. FDC update
  4. Tracking
  5. fADC125
  6. Other


Participants:Curtis, Naomi (CMU) Alex B., Marouen, Beni, Simon, Sergey, Cody, and Lubomir (JLab).

Collaboration meeting

- So far one slot in the tracking session (Mike's alignment), however it is not clear who wants to have a presentation. In principle we have short updates: CDC dE/dx amplitude vs integral (Naomi), dE/dx angular dependence (Lubomir), FDC efficiency (Alex A.), MC efforts, Simon's tracking modifications, FDC threshold upgrade. Naomi will decide how to organize the session.


- The plan is to start turning on the CDC systems and then do tests with cosmics. So far only the crates are on.


- The Wiener crate and the LV modules needed for the threshold system upgrade have arrived. Nick is working on the distribution box. Once the hardware is installed, Hovanes has to redo the control software, it might be tight in time before the December run.

- The FDC chiller and LV system has been turned on (see [3]). Issues with the MFCs are illustrated in the attached plot above: the flow varies with the mixing tank pressure. Beni suggested having a spare MFC for the FDC ( we don't have one). Curtis can buy one.


- Cody explained the self-triggering. He with Bryan's help checked it using testing set-up and it works. Naomi can't reproduce his result so far. The trigger is generated only within the module, so it can be used only for testing channels within the module, like when using 55Fe source. It can't be used with cosmics, for example. In the present version the readout can't go back in time w.r.t. trigger, but Beni suggested adding a constant delay to the trigger, which according to Cody can be easily implemented.


- Next meeting after the collaboration meeting.