[Halld] Run Coordinator Summary: March 28 - April 3

[Naomi Jarvis]

Dear Collaborators,

Here is the summary of activity during the last week:

We were scheduled to receive 122h of CW beam, we actually received 57h and
of that we used 52h.  The 5h of acceptable beam not used was mostly spent
on configuration changes - switching radiators or diamond orientation.  DAQ
problems only accounted for 1h of BANU, as by chance most of the DAQ
crashes occurred just before the beam disappeared for a while.

It was difficult for the accelerator to deliver the large currents needed
by Hall C (for boiling studies) whilst the other halls were running, and so
some time was dedicated to getting those completed.

We asked for beamline retuning three times, this resulted in improved beam
position stability and convergence.

During production running 4.8E9 triggers were collected.

Special tasks completed during the week include:

Identifying a new location on the diamond to improve the sharpness of the
coherent edge;
Threshold scans for the CDC and TOF;
Background studies for the CDC and FDC;
Pair spectrometer converter thickness study;
Preparatory work for the upcoming TAC run.

More details on the day to day running can be found at
https://halldweb.jlab.org/wiki/index.php/Run_Planning_Meeting_Notes,_Mar_29-Apr_4,_2018
.


Best regards,

Naomi Jarvis.
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