Run Coordinator report:2025run w2

We first received beam on Saturday evening (April 5), after problems with the Hall D harp, a magnet in the north linac and a water leak from the accelerator had all been found and corrected. The accelerator was down for maintenance on Tuesday, and commissioning a new RF separator yesterday during the day. In total we received 34h of CW beam on target, 30h of ABU and 4h of UED from the scheduled 92h. Most of the UED time was for replacing electronics in the hall and mending the turbopump at the downstream/east wall of the tagger hall, during the scheduled downtime some more shielding was added between the pump and the electron beamline.

There was one occasion when the first door to the hall was not closed properly, the magnetic lock did not engage and our PSS status dropped to unknown; the door was genuinely not quite closed (it moved when the sweep pushed it) - we have to be careful to avoid that happening in future as sweeping the hall takes quite a while.

As can be expected after such a long time since the previous run period, with new hardware and new software added, there were many minor issues (BTA IOC lost the names of the EPICS PVs to use, Rootspy could not make log entries, anything using RCDB had to be modified to use the new version, etc). These have now been fixed. During the weekend we got through the photon beam restoration stages - Hovanes commissioned the new beam profiler from Regina, Richard configured the active collimator and voltage scan data for the tagger microscope were recorded. On Monday Sasha started commissioning ECAL - we saw scaler readout indicating that all the channels are working, and Drew has already obtained some nice Compton data from ECAL.

We are transitioning into a pattern where Sasha continues to work on the trigger timing during the daytime when there is beam and we take data overnight using the latest trigger configuration. We experienced many problems with the DAQ lifetime dropping to nothing within 10 minutes of starting a run due to certain crates maintaining busy status. Sergey has been working to improve this, it now seems to be better than it was.

The shifters have been diligent in visiting the counting house a shift (or more) early, either to learn for the first time or for a refresher in what is going on, what has changed since they were last there, so that they are confident about what they will need to do when it is their turn.