[Hallc_running] [New Logentry] RC Daily update and RC meeting

[hanjie at jlab.org]

Logentry Text:
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Still no beam since Wednesday. The OSP for work on zones 2L22, 2L23 at north linac was approved yesterday around 3 pm. Zone 2L23 is back quickly. More severe situations on Zone 2L22 were discovered. More details on Zone 2L22 work can be found in the PD summary: https://logbooks.jlab.org/entry/4221742. RF team left around 9 pm as the team has been onsite 13+ hours. The machine was basically off overnight. RF team starts their work on Zone 2L23 early this morning, and they expect it to be 4-8 hours, then few hours for MCC to restore beam in the south linac. So beam will probably arrive at Swing shift. 

At this point, we gave up the plan to collect more elastic data. The NPS calorimeter will be moved back to 3m around 11 am today. A Moller measurement is planned for tomorrow.

Julie and the students made a good use of the down time to complete few things on the NPS calorimeter:

1.	Column 3 are removed: https://logbooks.jlab.org/entry/4221521
2.	Base of block 25-14 is replaced: https://logbooks.jlab.org/entry/4221560
3.	New shielding installed around the Keysight controller for the NPS chiller: https://logbooks.jlab.org/entry/4221571
4.	Remote power controller installed for the Keysight multiplexer mainframe: https://logbooks.jlab.org/entry/4221561

Some other notable things:

SHMS Dipole liquid supply valve fully opened: https://logbooks.jlab.org/entry/4221536, https://logbooks.jlab.org/entry/4221648

Steve’s possible explanation to the mysterious SHMS rotation: https://logbooks.jlab.org/entry/4221534

Beam current limit on LH/LD is increased to 50 uA at 4th pass: https://logbooks.jlab.org/entry/4221493

Wien angle change: https://logbooks.jlab.org/entry/4221516

There will be a RC meeting at 11 am: https://jlab-org.zoomgov.com/j/1617015555?pwd=L09IQ216dml6ZmM5ODExVjFsMX...
Meeting ID: 161 701 5555
Passcode: 288953





 



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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/4221748
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