[Halla_running] [New Logentry] RC Daily Update

[tianye at jlab.org]

Logentry Text:
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We went to production at 10:00am yesterday. Since the beam was very trippy,  the average efficiency of yesterday's DAY shifts is ~27%. During yesterday's SWING shift, there was 5-hours downtime due to 1L25 HPA Controller and FCC4 issues from the accelerator. Beam was back around 22:12, the swing shift crew quickly followed the regular startup procedure (https://logbooks.jlab.org/entry/3841949) to resume production, however, the beam was gone after they checked C-hole. The average efficiency of yesterday's swing shift is only ~19%. Today's OWL shift started without any beam, because the 2L26 was refusing to stay up during that time. Beam was back around 1:11 this early morning. We went to production quickly after checking the Compton background rate. Then target B ion chamber tripped at 150 uA while MCC confirmed the orbit looks nice. The OWL shift crew confirmed that the detector yield was OK and other ion chambers were stable during that time. Thus, we increased th!
 e setting point of target B (IIC1H04BMAx) ion chamber (6000->6500->6750->7000) to avoid related beam trips. The beam during OWL shift was also trippy, so we adjusted the current ramp rate and initial attention (https://logbooks.jlab.org/entry/3842085) to save more time from beam trips.  The average efficiency of OWL shift is ~36%.   

The plan for today is to continue the production and get more Coulomb!

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We have some shift trade requests for next week. Please sign up for those shifts if you can!
Shift sign-up: https://misportal.jlab.org/mis/physics/shiftSchedule/experimentRunId=PREX/CREX
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There is no RC meeting today. Have a nice holiday weekend! 

Ye Tian 

(Hall A Run Coordinator)

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This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/3842373
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