[Halla_running] [New Logentry] RC daily summary

[hszumila at jlab.org]

Logentry Text:
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As of 3:47am this morning, we lost Chicago. We are currently discussing the options going forward for the experiment, so I will send an update once that is determined. 

We ran on 35uA throughout the day shift yesterday. We had a strange incident during the NMR sweep at 12pm where the sweep stopped in the middle with a message about a memory problem (https://logbooks.jlab.org/entry/4148271). The second attempt to sweep after this yielded a rather lower polarization (~37%). Bill later noted that it looks like there is a blip where the Helmholtz coils dropped to 0 for a moment and could be responsible for the loss of polarization. After this, Bill raised the over temperature (https://logbooks.jlab.org/entry/4148278) and restarted 2 laser fibers (https://logbooks/entry/4148279). Mid-way through the owl shift, we experienced an increase in oven temperature and a simultaneous decrease in the cell temperature (https://logbooks.jlab.org/entry/4148708). The next 4 subsequent NMR sweeps showed loss of polarization and no signal by the end (see logbook entries https://logbooks.jlab.org/entry/4148668, https://logbooks.jlab.org/entry/4148673, https://lo!
 gbooks.jlab.org/entry/4148683, https://logbooks.jlab.org/entry/4148698). We took harp scans and checked for the carbon hole, but it's gone, see https://logbooks.jlab.org/entry/4148815. We officially lost the cell. See https://logbooks.jlab.org/entry/4148858

See the full summary: https://sbs.jlab.org/wiki/index.php/RC_meeting_and_Run_Plan,_Monday_March_13th

We will meet today at 3:30pm via: https://jlab-org.zoomgov.com/j/1619032184?pwd=aWhTVWxya1ZZQzA1K2ZPSTd2ZXZ2QT09

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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/4148882
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