[Hallb-engineering] Run status update
stepanya at jlab.org
Tue Oct 23 08:58:42 EDT 2018
We came back from the beam studies yesterday around 4:30pm, quite smooth
beam restoration. Took a Moller run with 1/2 wave plate IN, polarization
54.8+/-1.5%, plot on the run wiki has been updated. Then from 7pm we had
very nice beam and took production data till 8:30am today. Planned RF
recovery will be very short, only 2 hours, so we are not planning to
make an access to the hall unless it is critically necessary. After beam
is restored, expect some time around 10:30 am, we will continue
production running. Note, last night we reverted to 2 ph.e. threshold
trigger setting for HTCC since the 1 ph.e. cut had the same dips in the
electron phi-distributions (see log entries).
For tomorrow and Thursday situation is not clear. Looks like accelerator
is eager to provide beam to everyone in parallel to Hall-A's beam work.
Will know more about details of that two days some time at 2:30 pm.
There are number of things we want to do that require magnets to be OFF
and also short restricted access to remove stuff from hall. I will send
another email when machine plans for Wednesday and Thursday will be more
As of now, all shifts are ON, we are planning to man the counting house
for Wednesday and Thursday.
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