GlueX Start Counter Meeting, September 2, 2021
- Review of minutes from the last meeting
- Run preparations
- Resolution and Calibration
- Action Item Review
Present: Eugene Chudakov, Mark Ito (chair), Simon Taylor, Beni Zihlmann
There is a recording of this meeting on the BlueJeans site. Use your JLab credentials to gain access.
Review of minutes from the last meeting
We took a quick glance at the minutes from July 22. There was not a lot to discuss.
Two items of concern about the start counter as we go into the run.
- Broad pedestals. See Beni's logbook entry for the details. This effect is seen in all channels. Also the change occurred after the last run, i.e., during a period when there was no beam in the Hall. Sergey did a re-set of the pedestal levels in the F250s and took data. Beni will look at these new data next.
- Elevated temperature. One of the ten temperature channels (one channel per read-out board) is anomalously high (several degrees C). See [https://logbooks.jlab.org/entry/3897599 Nick Sandoval's logbook entry for the details. Nick found some pins in the cable that had been pushed out of position, but fixing those reduced noise on the signal but did not change the temperature level. Beni will look at pedestals in the three channels on this board and compare to the others.
Bias Voltage Scan
Beni pointed out that we have never looked at start counter performance using bias voltages other than the nominal ones. Mark will ask the BCAL folks about what they have done on this, what they looked at in the data, and what they learned from the exercise.