[Hallc_running] [Revised Logentry] RC daily update

sjjooste at jlab.org sjjooste at jlab.org
Sat Oct 13 14:00:03 EDT 2018

Logentry Text:
After 6 hours, the studies to improve the BLM trip rate was concluded after the start of swing, 
we had a very steady beam of 35uA (as requested) until 11pm. Then the beam was down for 
3 hours due to an issue with the cryo-modules. Around 2am, beam was restored and beam 
stayed very steady since. More info here: https://logbooks.jlab.org/entry/3608762
This is definitely some of the most stable beam I have seen so far.

Around noon, we noticed that all the files in the hallc_replay directory had disappeared 
(https://logbooks.jlab.org/entry/3608730). I contacted Eric and Brad, and Brad found 
out it was because someone accidentally executed an "rm -r *" in hallc_replay. Brad 
had a backup from 11pm yesterday and we still had the experiment CSV file open in 
an editor, so we were able to recover the full hallc_replay directory smoothly.

We took data at the Q2=3. W=3.14 x=0.25 theta_Shms=6.495 deg kinematic point 
and collected ~12% of the total statistics goal. The owl shift crew brought up the fact 
that the lambda missing mass distribution in the online reconstruction looks about 
twice as wide in this setting, meaning we might be underestimating the amount of 
lambda events collected by a factor of ~2.
At 1pm, we changed to the Al dummy target and will stay here for 2 hours. We will 
then resume data taking on LH2, and move to the next kinematic point either during 
the end of the owl shift, or the beginning of the day shift tomorrow.

There will be an RC meeting today at 4:30 pm on the second floor of the counting house. 

For a summary of the meeting: 

To join the Meeting:

To join via Room System:
Video Conferencing System: bjn.vc -or-
Meeting ID : 861439920

To join via phone :
1) Dial:
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(see all numbers - http://bluejeans.com/numbers)

2) Enter Conference ID : 861439920


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/3608771
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