[Halla_running] [New Logentry] RC Report for Friday, April 22

[vasulk at jlab.org]

Logentry Text:
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Since yesterday afternoon, we have been smoothly running production at 60 uA on the LH2 target.  The beam trips 
have been reasonable so far with about 10 per hour.  This provides maybe a 70% to 80% beam up time during an 
hour long run, depending on the length of the trips.  Earlier this morning, MCC took the beam away at 09:00 to check 
the Hall B laser.  Beam was restored at 09:30.  Unfortunately at 10:46, the accelerator begin to suffer from multiple 
BLA trips and several IOCs needed to be rebooted.  They are still struggling to get stable high current back to Hall A.

At 17:00, MCC will begin to bring Hall B back up to run three halls over the weekend.  Then the rest of the weekend 
should be production running until Monday morning at 06:00 when beam goes off for this run period.

Last night, a one-hour run was taken on the 15 cm dummy target for background estimates.  Based on this run, we will 
probably take an additional 2-3 hours of dummy target data later this weekend after we get more statistics on the LH2 
target.

Issues:
Ciprian Gal and Caryn Palatchi have reported that the new receiver is saturating at 60 uA.   See relevant entries below.
We have some independent confirmation from the right HRS analysis of the BCM calibration yesterday as well.  DVCS is
currently analyzing the left HRS data.  Unfortunately, this means the signals from the new receiver are not useful for high 
current running.  We could adjust the gain on the receiver, but then we lose any calibration from these signals.  The analog 
BCM signals are still good, and we will have to rely on those for our charge normalization during this period of running.

https://logbooks.jlab.org/entry/3401893

https://logbooks.jlab.org/entry/3401894

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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/3401919
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