MEDCON5 Shutdown Plan

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SAD Operations Introduction

Hall D is entering the SAD Sept 21 between 6 and 8am. The plan is to have minimum people in the Hall or Counting House simultaneously. The 6' social distancing rule shall be adhered to. If not possible, AD (Rolf) approval is required and PPE is needed.

All work is to be summarized in the HDSAD logbook https://logbooks.jlab.org/book/hdsad

All special accesses and requests should be communicated through the Hall D SAD mailing list "halld-sad@jlab.org" <halld-sad@jlab.org>

The Hot Check Out lists will be started shortly thereafter

Access

If it is possible, all work done in the hall should be done after RADCON surveys the Hall, collimator cave and Tagger. Mark Stevens will contact Dave Hamlette. Most likely it will be later in the morning before RADCON gets to Hall D. If using rapid/Controlled access, only one person in the labyrinth at a time. The Run Coordinator in conjunction with the Work Coordinator will coordinate these efforts to minimize people in the Hall.

Once in restricted access, the Work Coordinator or Designee will direct traffic in the hall. If you need to come to the hall during the SAD, an email should be sent prior to coming to Eugene, Mark Stevens and Scot Spiegel so current conditions and work can be discussed.

The WC can be contacted at 757-876-3940

There is a new OSP to be read, understood and signed. A hard copy will be posted in the counting house.

 https://misportal.jlab.org/mis/apps/mis_forms/operational_safety_procedure_form.cfm?entry_id=106466

General Timing of Work in the Hall

It is assumed the Hall will be in rapid (controlled) access until late morning

  • The Tech crew will be in early morning as usual. They will start performing the Mechanical shutdown list.
  • Solenoid ramp down will be started .
  • Electronics HCO shutdown in hall
  • Target Shutdown, shift person to empty target. Chris Keith comes to secure Target
  • SAD activities will start after all HCO shutdown is complete.

Target

  1. EMPTY the target. This boils almost all the hydrogen back into the storage tank and takes about 10 minutes or so; -- Shiftworker
  2. When the target reads "EMPTY and ready for beam"
  3. Inform Chris Keith at 757-746-9277. -- Tim
    • Chris will secure the system. That should require an access to the hall of only 5 minutes;
      • Ensure that both H2 tanks are valved off
      • Turn off the turbo station that is pumping on the OVC
      • Turn off the pulse tube compressor and kill power at the service disconnect ?


File:HCO - ENP Target Hall D Shutdown Checklist.pdf

Solenoid

Intention is to keep magnet full and cold at 4k

  1. Set ramp goal to 0 A and ramp down -- Shift worker or Tim
  2. Cryogenics is secured for the shutdown. Magnet will stay at 4K for the SAD -- Tim and Cryo
  3. After magnet PS reaches 0A, turn off power supply and depress mushroom button on PS -- Scot
  4. Stop recording PXI data -- Tim

Mechanical

Perform Mechanical HCO Shutdown list

File:HCO - Hall D Mechanical Hall D Shutdown Checklist.pdf
File:HCO - Hall D Solenoid Hall D Shutdown Checklist.pdf

Electrical

Perform Electonics HCO Shutdown list

File:HCO - Hall D Electronics Hall D Shutdown Checklist.pdf


Much of this work that can be done on the CSS screens should be performed by the Shift leader/Mark Dalton/Run Coordinator if not otherwise noted

References

This is was initially based on the shutdown checklists.

File:HCO - Hall D Electronics Hall D Shutdown Checklist.pdf
File:HCO - Hall D Mechanical Hall D Shutdown Checklist.pdf
File:HCO - Hall D Solenoid Hall D Shutdown Checklist.pdf
File:HCO - ENP Target Hall D Shutdown Checklist.pdf