RC meeting and Run Plan, Thursday Nov. 9, 2023

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Return to the RC Meeting Calendar

RC Meeting Information

Time: Monday - Friday at 3:30pm

  • Location: Counting house conference room
  • ZoomGov Meeting Connection Information

https://sbs.jlab.org/cgi-bin/DocDB/private/ShowDocument?docid=431

Useful Links

Procedures

Hall A call-in instructions:

  • Call RC first.
  • Techs on site 7am-4:30pm Mon-Thu, 7-11am Fri. RC will call Hall A work coordinator (Zak) during normal working hours. After hours, RC calls Tech on-call.
  • After 9pm everything non-emergency needs to be deferred. What is emergency and what's not? Call RC. RC talks with Mark to decide.

Hall Access procedure:

  • Access check list (binder on the counting room desk) needs to be filled out before making *any* access.
  • Scan (take pictures with phone) and post it to the logbook.
  • Any work inside the SBS, BB boundary need to have PS locked out -- requires two QEWs to throw the big switch. Exception: field measurements.

Status Update

Overall Summary

General

  • We are troubleshooting GEMs and optimizing the target while awaiting beam.

Shift Plan

  • All shifts are canceled through Monday Day shift.
  • Starting Monday Swing, shifters are on standby.

Beam

  • None!

Hall A Dump Repair

  • The leak has been valved off and stopped.
  • The pumps still need to be started.
  • Stuart laid out the following conditions for restarting and for us to get beam again:
    • "We have implemented a set of robust controls/alarms/interlocks that are available in the CEBAF control system that either automatically take action or prompt the operator to take action regarding the Hall A beam dump system and it cooling loop operation, whether the beam is operating or not. This includes all aspects of that cooling loop system including the provision for controlled release."
    • "We have articulated clear ownership and lines of responsibility for the high-power Beam Dumps as operating systems. An operating system has a clearly defined system owner who is responsible for operation, maintenance, spares planning etc."
    • "We have a plan for bringing the Hall C system up to that same level of robust operation."
  • Mark is attending an accelerator meeting at 3:30pm and can give an update on the progress of these conditions afterwards.

Accelerator status

Data collected :

None!

Hall A Subsystems Status

Target

  • Target group is working on calibrations (Bill Henry)
    • Doing spin ups during the day and spin downs at night.
    • First EPR showed a polarization of 46%

Detectors

  • GEMs (Holly Szumila-Vance)
    • The top module of the 5th layer is not reading out any vertical strips.
    • They tried replacing the short HDMI cable today, but it didn't fix the issue.
    • The module cannot be fixed without removing it from the stack.
    • Scintillators should come down this evening or tomorrow morning.
  • GRINCH (Eric Fuchey)
    • Sometimes the scale for the gas bottles freezes. Ellen reset it, and all is good now.

Magnets

  • SBS and BB are off.

Hall access requests

We are in restricted access.

  • Ralph wants to go into the hall tomorrow to check a few hodoscope channels.
  • Don wants to work on ECal.

NOTE: the hall will stay in restricted access through the weekend.


Shift schedule

IMMINENT OPEN SHIFTS

  • Lots of open Owl shifts!

Please check when your shifts are!

https://misportal.jlab.org/mis/physics/shiftSchedule/?experimentRunId=SBS-GEn-2022

Please sign up for any open shifts!

Running Plan


==> List of items in case He3 production running isn’t ready:

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