Difference between revisions of "Run Coordinator report: Fall 2021 w12"
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Run Coordinator Report for November 4 - November 10, 2021 | Run Coordinator Report for November 4 - November 10, 2021 | ||
| − | In this week, we completed the run period 2021-08 for the PrimEx-eta experiment (E12-10-011) and commissioned the SRC/CT experiment in Hall D. We were scheduled for 88h of running and we received beam for 48.8h (55.5%). We used the beam for 45.8h, the minor down time was caused by an access to the tagger hall to reset 2 controllers for the goniometer, which required RadCon survey, and another access to the experimental hall to reset unresponsive VME crates. | + | In this week, we completed the run period 2021-08 for the PrimEx-eta experiment (E12-10-011) and commissioned the SRC/CT experiment in Hall D. We were scheduled for 88h of running and we received beam for 48.8h (55.5%). We used the beam for 45.8h, the minor down time was caused by an access to the tagger hall to reset 2 controllers for the goniometer, which required RadCon survey, and another access to the experimental hall to reset unresponsive VME crates. Completing the run period, we used 100% of the scheduled experiment hours and collected 90% of the total experiment data. The beam energy during this run period was lower than initially requested in the proposal, which resulted in a lower figure of merit for the PrimEx-eta experiment. |
We started this week with an accelerator maintenance day on November 3rd, during which we replace 15 FCal bases. The beam was finally restored around 11pm, but several interruptions prevented us from stable data taking. Only at 2pm the following day, we could resume production running until Friday 8am, when the beam was taken away for a beam energy change. This was the end of the PrimEx-eta experiment in Hall D for this year. We used about 1h of the beam for Trigger studies for the upcoming SRC/CT experiment with different beam currents. | We started this week with an accelerator maintenance day on November 3rd, during which we replace 15 FCal bases. The beam was finally restored around 11pm, but several interruptions prevented us from stable data taking. Only at 2pm the following day, we could resume production running until Friday 8am, when the beam was taken away for a beam energy change. This was the end of the PrimEx-eta experiment in Hall D for this year. We used about 1h of the beam for Trigger studies for the upcoming SRC/CT experiment with different beam currents. | ||
Revision as of 12:49, 19 November 2021
Run Coordinator Report for November 4 - November 10, 2021
In this week, we completed the run period 2021-08 for the PrimEx-eta experiment (E12-10-011) and commissioned the SRC/CT experiment in Hall D. We were scheduled for 88h of running and we received beam for 48.8h (55.5%). We used the beam for 45.8h, the minor down time was caused by an access to the tagger hall to reset 2 controllers for the goniometer, which required RadCon survey, and another access to the experimental hall to reset unresponsive VME crates. Completing the run period, we used 100% of the scheduled experiment hours and collected 90% of the total experiment data. The beam energy during this run period was lower than initially requested in the proposal, which resulted in a lower figure of merit for the PrimEx-eta experiment.
We started this week with an accelerator maintenance day on November 3rd, during which we replace 15 FCal bases. The beam was finally restored around 11pm, but several interruptions prevented us from stable data taking. Only at 2pm the following day, we could resume production running until Friday 8am, when the beam was taken away for a beam energy change. This was the end of the PrimEx-eta experiment in Hall D for this year. We used about 1h of the beam for Trigger studies for the upcoming SRC/CT experiment with different beam currents.
During the accelerator reconfiguration, we performed a Safety Walkthrough, installed new equipment in the test area behind the PS and switched the DAQ and monitoring setup to the new run period 2021-11. The plan was to leave the counting house not staffed between Friday 10am and Monday 4am. During this time, the vacuum in coil 4 of the solenoid degraded, which lead to a dump before the auxiliary pump could be turned on. The vacuum quickly recovered afterwards, and we could already start ramping up the solenoid to 800A on Saturday. It was fully restored on Sunday afternoon, effectively causing no down time on our side.
The accelerator reconfiguration was completed on Sunday at 5pm, 2 shifts ahead of schedule. We found volunteers for both shifts and were able to begin the photon beam checkout. The initial harp scan showed very bad convergence in y, and it was quickly realized that a vertical dispersion quadrupole was not set to the design set point. In addition, the cycling of the tagger magnet power supply failed, needing changes to the maximum set point and the ramping speed. After this, the harp scan came back within specifications and we could continue the photon beam checkout. After adjustments to the beam position and the before-mentioned reset of the goniometer controllers, it was too late to start the diamond alignment, so we recorded some data on the amorphous Al target during the night. With very stable beam, we could complete the diamond alignment for all for orientations in essentially one shift on Tuesday, did some trigger tuning and included the TPOL in the readout. By Tuesday evening, we were ready to start production data taking for the SRC/CT experiment, which was only interrupted by another accelerator reconfiguration on Wednesday morning.
