[Hallc_running] [New Logentry] RC Daily Update

rmontgom at jlab.org rmontgom at jlab.org
Thu Nov 22 13:15:02 EST 2018

Logentry Text:
Happy Thanksgiving!

Summary and status:
- There was an extended downtime starting during owl shift (owl had ~68.5% BNA and 31.5% ABU) (https://logbooks.jlab.org/entry/3629838). This was mostly caused by a loss of communication with 1L24 in the north linac. 
- Since swing yesterday we have been taking production data for Group 11 (Q2 = 5.0, x = 0.5, pi+).
- Beam is back now since ~12:10 and we are continuing data taking on group 11.
- This will be followed by: Group 12 (Q2 = 5.0, x = 0.5, pi-), SHMS electron singles at end of setting 12, Group 8 (Q2 = 3.979, x = 0.5, pi-), Group 7 (Q2 = 3.979, x = 0.5, pi+).

RC Meeting:
- We have no planned RC meetings until Monday. Unless there is a special request then please let me know.

Notices in effect for shift crews:
* NB!!! If the HV trips for SHMS S1Y5B contact Simona M. '''DO NOT change the HV from the nominal value!'''
* Shift leaders, please fill out the check list once per shift!
* It is no longer required to fill out the standard.kinematics file online, it is now done automagically
* Split the large desired charge between multiple runs (~1 hour per run)
* Listed currents are estimates. For runs at less than 70uA, increase current until SHMS singles rates are between 450k-500k.
* How-to power cycle PLC I/O chassis: https://logbooks.jlab.org/entry/3625862, https://logbooks.jlab.org/entry/3625900

Planned accelerator configuration changes:
Monday, Nov 26: Energy change to 1.86 GeV/pass and move to 500 MHz laser. Hall will go to restricted access on Monday morning and current aim is to be locked up again Tuesday Swing. There will be a separate e-mail about shift updates.

Planned accesses to the hall:
Monday, Nov 26: Work in the hall should be coordinated with Walter K. Important aerogel change taking place (~8 hours duration Mon). HGC work will also take place. D. Meekins will also investigate loop 3 JT valve issue.
Tuesday, Nov 27: installing brushes near the spectrometer wheels for S. Lassiter (originally planned for Tue/Wed).
Please let me know if there are any other plans for work in the hall.

Special requests:
Harp scan at 3H07A and 3H07B with raster off to address possible issues with harp (https://logbooks.jlab.org/entry/3624463).
Vijay Kumar (Regina group) has requested a walkthrough Monday morning.


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/3629892
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