[Halla_running] RC update, 01/19

[Iuliia Skorodumina]

We started Wednesday Swing Shift in Controlled Access.


GEM experts were working in the hall (see https://logbooks.jlab.org/entry/4112604). GEMs need further software alignment. GEM experts will do the alignment once we start taking data.


Jiwan was working on HCal. See his logentry https://logbooks.jlab.org/entry/4112681


Around 19:30 the Hall went to the Beam Permit. MCC started beam tuning around 8pm.


Around 22:30 the CW beam was sent and we started the Beam Checkout. Bill provided detailed instructions to the Shift Crew (see https://logbooks.jlab.org/entry/4112725) and was monitoring the Beam Checkout remotely.


The beam turned out to be very wide in X. MCC was trying to reduce the beam size up until 5am, but the beam remained too wide. At 5 am the beam was gone and did not resume until the end of the Owl shift (8am). See Owl shift summary (https://logbooks.jlab.org/entry/4112938).


Since we did not succeed with establishing production beam during Owl, we cannot take 45 uA on glass cells during the MCC current push. For this reason, MCC suggested us to take up to 45 uA on a Carbon target (Carbon Hole) for the purpose of the current push and to establish the production beam afterwards. However, we cannot proceed with this plan until we check the raster size and update operational restrictions accordingly (as recently we made changes to the raster coils/generators). Therefore, Jiwan is currently working on checking the raster size on a Carbon Hole. The MCC current push is postponed until 10 am.

Best regards,
Iuliia Skorodumina,
Hall A RC

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