[Halld] [Revised Logentry] RC Summary of Past 24 Hours

[andrsmit at jlab.org]

Logentry Text:
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Over the past 24 hours we collected another 2.1B total triggers on the He4 target with 200nA beam. This puts the total trigger count since the target was filled on Thursday to about 7.3B. The beam stability was very good throughout most of the day. However, at about 7PM last night there was a 2K Cold Box trip which caused the entire NL to trip. The same issue occurred a couple of weeks ago, and so the same recovery strategy was used to restore beam operating conditions. In total, the beam was down for about 8.5 hours due to this. When it was restored (at around 3:30AM), we proceeded with the usual harp scans and resumed production data taking at 200nA. 

There is one ongoing issue from our side, which is that one CAEN HV crate for the TAGH has stopped communicating. The scalers are still counting, and the data quality looks okay in rootspy. Hovannes recommended that we continue running over the weekend without resetting this HV crate , because if there is some issue with the HV after the reset, we will need technical support which may not be readily available until Monday. The shift crew were instructed to pay close attention to the TAGH scalers, as any HV outage will be seen there.

Best,
-- Drew

=== Past 24 hours ===
*2.1B triggers collected on He target since yesterday morning 8:30AM (as of 8:30AM Sunday morning)
*Beam was down for ~8.5hrs from 7PM Saturday night to 3:30AM Sunday morning due to 2K Cold Box trip.
*When beam was restored, we did the usual harp scans
**[https://logbooks.jlab.org/entry/4060072 results]
* Shift Summary
** [https://logbooks.jlab.org/entry/4060075 Early Riser Sunday]
** [ Owl Saturday/Sunday]
** [https://logbooks.jlab.org/entry/4059773 Swing Saturday]
** [https://logbooks.jlab.org/entry/4059599 Day Saturday]
** [https://logbooks.jlab.org/entry/4059426 Early Riser Saturday]

=== Issues ===
*[https://logbooks.jlab.org/entry/4059878 CAEN HV crate for TAGH (counters 1-120) not communicating]

=== Plan ===
*Continue taking production data at 200nA over the weekend.


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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/4060278
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