[Rgc] [Revised Logentry] RC Daily Summary - 7 November

[Eugene Pasyuk]

The vertical raster size was increased Vpp from 3.1 to 3.3 V yesterday morning. The raster diameter now is close to 19 mm. The density of NH3 looks more uniform after annealing manipulation.

-Eugene

From: Rgc <rgc-bounces at jlab.org> On Behalf Of Bryan McKinnon via Rgc
Sent: Monday, November 07, 2022 07:45
To: rgc at jlab.org
Subject: [Rgc] [Revised Logentry] RC Daily Summary - 7 November

RC Daily Summary - 7 November<https://logbooks.jlab.org/entry/4078002>

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Lognumber 4078002<https://logbooks.jlab.org/entry/4078002>. Submitted by mckinnon<https://logbooks.jlab.org/user/mckinnon> on Mon, 11/07/2022 - 06:56<https://logbooks.jlab.org/entries?start_date=1667818577&end_date=1667825777&book=HBLOG>.
Last updated on Mon, 11/07/2022 - 07:40
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mckinnon

Another challenging 24 hours of beam delivery and tuning.

Day shift began with the tagger degaussing. Once we were ready for beam delivery, MCC could not send more than 4nA due to our halos tripping the FSD.
Upstream halo was an order of magnitude higher, midstream was a a factor of 2 higher. Indication of bleadthrough. We worked with Eugene to check raster and beam positions whilst also having MCC check upstream beam. They closed our slit slightly and the beam looked good. A new position on 2H01 x was established as -1.8.
Shift ends in production.

Swing shift continues was production data taking. Target polarisation is ~78%.
Around 7pm the beam is becoming very unstable and trippy. By 11pm MCC inform us that they are again unable to ramp up our beam. By 1:45am we are back in production running at 8nA and continuing....

Run plan (pre-7:45 RC and 8:00 MCC Ops meeting) for today is to take NH3+ data and hope for some stability.

RC meeting today at 2pm
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