Run Coordinator report: fall 2022 w7

Run Coordinator Weekly Report October 5 - 12

Started taking over RC duties on Wednesday afternoon, October 5, with no beam since Tuesday morning. The problem were two magnets, RSEP8. Experts eventually figured out that one of the problems was that some of the narrow cooling channels were clogged, reducing LCW flow. This was finally cleared by Friday afternoon. The condcutivity of LCW was too high to commence hot checkout of the magnets. It took until early eveing on Saturday, October 8, that LCW conductivity dropped down to the required <2uSiemens, and beam delivery could resume. Magnet hot checkouts were performed and eventually beam delivery resumed during owl shift, Sunday, October 9.

Because of the extended downtime, we first verified focussing on the collimator with harp scans, and then resumed data taking on the 4He target. On the morning of Tuesday 10/11 we had collected about 3.5 B additional triggers for a total of ~13 B triggers on the full target; we emptied the target and started empty target runs for background studies. By Wednesday (today) 4 pm, we had collected about 1.4B triggers of the required 1.8B triggers. We plan to continue taking data on empty until the morning of Thursday, October 13. After that we'll resume full target prodcution.

The report I presented at the 1:30 pm weekly MCC meeting can be found at https://cebaf.jlab.org/pd/run-coordinator-reports/1845. Notable downtime causes in Hall D were 4.2 hrs for DAQ, 1.6 hrs for Planned configuration changes (harp scans, DAQ run starts), and 0.75 hrs CDC HV. Percentage of total experiment data collected to date is 38.5% and percentage of total scheduled experiment hours to date is 41.5%. So, we are falling slightly behind right now.

I had to make an unplanned trip back to Miami for one night on the weekend. Igal was kind enought to substitute for me on the weekend. Thank you Igal.

We had difficulties finding an RC for this week. As I am around anyhow until Friday, I will continue until then. Andrew Smith (aka Drew), who was RC the week before me, will take over Friday afternoon and take it through next Wednesday, when Arshak Asaturyan will take over.

There are still RCs needed starting January 25, 2023: https://www.jlab.org/Hall-D/shifts/index.php?start_day=24&start_month=1&...

If you have the expertise, please consider signing up.