Difference between revisions of "Run Coordinator report: summer 2022 w6"

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(Created page with "During this week we took data on both the full Pb and empty targets. We accumulated 1 B events on empty target at 30 nA to study systematics. We took 2.5 B events on empty tar...")
 
 
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During this week we took data on both the full Pb and empty targets. We accumulated 1 B events on empty target at 30 nA to study systematics. We took 2.5 B events on empty target at 60 nA and 10.9 B triggers on full Pb target at the nominal production current of 30 nA.
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During this week we took data on both the full Pb and empty targets. We accumulated 1 B events on empty target at 30 nA to study systematics. We took 2.5 B events on empty target at 60 nA and 10.9 B triggers on full Pb target at the nominal production current of 30 nA. Despite several setbacks, the accumulated statistics is roughly on par as previous weeks.
  
 
The accelerator had several interruptions due to thunderstorms during swing shift (especially Jul 13 and 16). Entire shifts were lost to these storms. The Arc 3 power supply died on Tuesday evening and kept the beam off till it was replaced with a spare on Wednesday during the scheduled maintenance. Still the accelerator was able to slowly increase stable current delivery to Hall C of 48 uA at the beginning of the week to 65 uA at the end of the week. Beam trips were at the level of about 15-20 trips/hr with half due to RF trips. Previously Hall C had been receiving less than 40 uA. During up times, beam to Hall D was fairly stable with increasingly good stability on the active collimator as well as stable transmission.  
 
The accelerator had several interruptions due to thunderstorms during swing shift (especially Jul 13 and 16). Entire shifts were lost to these storms. The Arc 3 power supply died on Tuesday evening and kept the beam off till it was replaced with a spare on Wednesday during the scheduled maintenance. Still the accelerator was able to slowly increase stable current delivery to Hall C of 48 uA at the beginning of the week to 65 uA at the end of the week. Beam trips were at the level of about 15-20 trips/hr with half due to RF trips. Previously Hall C had been receiving less than 40 uA. During up times, beam to Hall D was fairly stable with increasingly good stability on the active collimator as well as stable transmission.  

Latest revision as of 17:35, 21 July 2022

During this week we took data on both the full Pb and empty targets. We accumulated 1 B events on empty target at 30 nA to study systematics. We took 2.5 B events on empty target at 60 nA and 10.9 B triggers on full Pb target at the nominal production current of 30 nA. Despite several setbacks, the accumulated statistics is roughly on par as previous weeks.

The accelerator had several interruptions due to thunderstorms during swing shift (especially Jul 13 and 16). Entire shifts were lost to these storms. The Arc 3 power supply died on Tuesday evening and kept the beam off till it was replaced with a spare on Wednesday during the scheduled maintenance. Still the accelerator was able to slowly increase stable current delivery to Hall C of 48 uA at the beginning of the week to 65 uA at the end of the week. Beam trips were at the level of about 15-20 trips/hr with half due to RF trips. Previously Hall C had been receiving less than 40 uA. During up times, beam to Hall D was fairly stable with increasingly good stability on the active collimator as well as stable transmission.

Beni and Simon were able to show physics signals in the neutral channel (pi0 in 2g and w in 3g) demonstrating that the data are of reasonable quality.

This week we were impacted by two electronic problems: 1) fadc125 module in slot 19 of crate rocfdc11. The previous week the board had been moved from slot 3 to slot 19. For a couple of days the board was commented out of the configuration to continue running. Finally during the accelerator maintenance on Wed Jul 20, Cody and Sergey fixed the problem, which still must be monitored with beam. 2) flash250 module in the FCAL failed on owl shift of Mon Jul 18. The board was replaced in the early morning. In addition to the loss of 16 blocks, the failed card significantly affected the behavior of the trigger.

Elton Smith