Minutes-11-12-2015

November 12, 2015 Drift Chamber meeting

Connection

1. Instructions for Bluejeans meeting connection
2. Meeting ID: 290664653
3. To join via a Web Browser, go to the page [1] https://bluejeans.com/290664653.

Agenda

1. CDC update (Mike, Simon)
   • Fitting the time to distance relation
2. FDC update (Lubomir, Luke)
   • Spare package in the Hall
3. Electronics (Fernando, Chris, Nick)
   • Response Function with scope 300mV, 600mV
   • Response Function with fADC125: 300mV, 600mV, summary plot
4. Engineering (Dave)
5. Other

Minutes

Participants: Curtis, Naomi, Mike (CMU), Sean (NU), Fernando, Cody, Luke, Dave, Chris, Nick, Simon, Beni, and Lubomir (JLab).

CDC update

- Mike showed presentation (attached) about precise fitting of the time-to-distance in presence of tube deformation. The 3D plots show the average drift distance (from track fitting) as function of drift time and wire offset from the center. The Garfield results don't describe the data very well, but using the same functional form they were fitted to the data. The time-to-distance relation obtained in this way turned out to be different for different runs (not clear why). As a result of this procedure the resolution looks very good (last slide). Once Mike has the correct relation he plans to run the alignment procedure once more.

- Plan to run DAQ with both CDC and FDC over the weekend. Cody made some fixes in the firmware.

FDC update

- On Wednesday the spare package has been moved to the Hall (picture). Signal and LV cables have been connected. We will use the right side of the ST crate - the setting of the TI needs to be changed. HV connections and grounding will be done soon. The middle of the package is above the beam line, thus making space around it. There will be also no need to remove it when backing the target and working on the CDC. Curtis mentioned the need to protect the package at the downstream side - after the meeting aluminum cover was installed there.