This page describes the steps to take to shut off the S800 and S3 vault under two possible scenarios. A Controlled Shutdown involves a scheduled and well-planned shutdown, where there is enough time to schedule and coordinate resources, and communicate with all relevant stakeholders. An Emergency Shutdown, on the other hand, concerns unanticipated situations where the S800 and/or S3 vault must be shut off on a short noticed.

• Controlled Shutdown
• Emergency Shutdown

The following checklist describes the steps to follow during a controlled shutdown, where there is enough time to coordinate and plan the job. Please, be aware that the procedures described below involve many different systems in the lab. As such, it is critical to coordinate with operations staff using all available communication channels (face-to-face, hourlog, 8am-meeting and short-meeting). Also, a Work-Control-Plan should be submitted.

The mantra: Communication is essential.

• Give heads up to Operations (beam coordinator).
• Heads up to any experimenters planning to run in the vault.
• Heads up to Cryogenics group (request support if needed).
• Heads up to Magnet group (request support if needed).
• Heads up to Vacuum group (request support if needed).
• Prepare and submit a Work Control Plan, at least one week in advance.
• Before and after completion of work, make an entry in Hourlog indicating status of S800. Include also contact information.

• Turn off all GUI-controlled HV (including iSeg HV for hodoscope (crystal #20), located in S3 crate attached to FP chamber).
• Turn off power supply preamps and CRDC interface boards (same S3 crate attached to FP chamber).
• Turn off all manual HV in dU6 (OBJ SCI, CRDCs grid).
• Empty detectors and make sure that valves configuration matches “emptied” status described in Wiki.
• Close gas bottles and valves downstream of regulators.
• Turn off CRDCs chiller.

• Close ALL gate valves.
• Vent focal-plane chamber with dry N2. In order to prevent air from leaking into the chamber (avoid humidity), make sure that dry-N2 pressure inside the chamber is slightly above 760 Torr. VERY IMPORTANT: during the shutdown, it is important to make sure that the chamber is always filled with dry-N2.
• Make sure that FP Turbo-pump is OFF (turn OFF Turbo Pump chiller).
• Turn off focal-plane big mechanical pump and make sure that both rough and foreline valves are closed.
• Vent all sections, including Spectrograph D1/D2 chamber (assistance from vacuum group might be needed). If possible, keep dry-N2 through the cold head.
• Make sure that all sections are at atmospheric pressure.
• Turn off all turb pumps.
• Turn off all mechanical pumps. Close rough and foreline valves.

• Retract all linear drives.
• Open beam blockers.
• If possible, remove OBJ scintillator and Si detectors and keep them in A1900/detector lab.

• Set all Brhos to 0 Tm.
• Turn off all power supplies, including steerers.
• If possible, reduce He lead flows.
• Turn off Metrolab NMR controller in mezzanine level.
• Turn off NMR controller terminal server in mezzanine level.

• Notify (e.g. email) Cryogenics that all magnets are off.
• Check if there is any He lead return pipe open. If so, notify Magnet group and/or Cryogenics group so they can close it at their earliest convenience.

• Turn on exhaust fan.
• Leave all lights in the vault ON.
• Leave vault unsecured and fully accessible.

• Turn off all crates in S800 rack (S3 vault).
• Turn off all crates in dU6.
• Shut down s800fp PC (in S3).
• Shut down ctl-s3 PC (S3, mezzanine level)
• Shut down u6pc5.
• Shut down spdaq50.

The following checklist describes the steps to follow during an emergency shutdown. The assumed scenario is that where the entire S800 (and S3 vault) must be turned off on short notice due to unanticipated reasons. Please, be aware that the procedures described below involve many different systems in the lab. As such, it is highly recommended to coordinate with operations staff using all available communication channels (face-to-face, hourlog, 8am-meeting and short-meeting).

• Give heads up to Operations (control room).
• If possible, give heads up (via email) to Cryogenics, Magnet group, Vaccum group, and experimenters.
• Before and after completion of work, make an entry in Hourlog indicating status of S800. Include also contact information.

• Turn off all GUI-controlled HV (including iSeg HV for hodoscope (crystal #20), located in S3 crate attached to FP chamber).
• Turn off power supply preamps and CRDC interface boards (same S3 crate attached to FP chamber).
• Turn off all manual HV in dU6 (OBJ SCI, CRDCs grid).
• Empty detectors and make sure that valves configuration matches “emptied” status described in Wiki.
• Close gas bottles and valves downstream of regulators.
• Turn off CRDCs chiller.

• Close ALL gate valves.
• Vent focal-plane chamber with dry N2. In order to prevent air from leaking into the chamber (avoid humidity), make sure that dry-N2 pressure inside the chamber is slightly above 760 Torr. VERY IMPORTANT: during the shutdown, it is important to make sure that the chamber is always filled with dry-N2.
• Make sure that FP Turbo-pump is OFF (turn OFF Turbo Pump chiller).
• Turn off focal-plane big mechanical pump and make sure that both rough and foreline valves are closed.
• Vent all sections, including Spectrograph D1/D2 chamber (assistance from vacuum group might be needed). If possible, keep dry-N2 through the cold head.
• Make sure that all sections are at atmospheric pressure.
• Turn off all turbo pumps.
• Turn off all mechanical pumps. Close rough and foreline valves.

• Set all Brhos to 0 Tm.
• Turn off all power supplies, including steerers.

• Notify (e.g. email) Cryogenics that all magnets are off.
• Check if there is any He lead return pipe open. If so, notify Magnet group and/or Cryogenics group so they can close it at their earliest convenience.

• Turn on FAN
• Leave all lights in the vault ON
• Leave vault unsecured and fully accessible
• Put signs in S3 and S2/S3 doors indicating that “S3 vault is under emergency shutdown”; include contacts:
  • Jorge Pereira (S3 vault coordinator, S800 Device Physicist)
  • Shumpei Noji (S800 Device Physicist)
  • Antonio Villari (S3 vault manager)
  • Daniel Bazin (S800 Senior Device Physicist
  • Remco Zegers (Magnetic Spectrometer group leader)

• Turn off all crates in S800 rack (S3 vault).
• Turn off all crates in dU6.
• Shut down spdaq50.

• Give heads up to Operations (beam coordinator)
• Heads up to any experimenters planning to run in the vault
• Heads up to GRETINA group
• Heads up to Cryogenics group
• Heads up to Magnet group
• Make an entry in Hourlog indicating status of S800. Include also contact information.
• If possible, prepare and submit a Work-Control Plan

• Turn off all GUI-controlled HV (including iSeg HV for hodoscope (crystal #20), located in S3 crate attached to FP chamber)
• Turn off power supply preamps and CRDC interface boards (same S3 crate attached to FP chamber)
• Turn off all manual HV in dU6 (OBJ SCI, CRDCs grid)
• Empty detectors and make sure that valves configuration matches “emptied” status described in Wiki
• Close gas bottles and valves downstream of regulators

• Retract all linear drives
• Open beam blockers

• Close ALL gate valves
• VERY IMPORTANT: Vent FP box, but leave dry N2 flowing (it requires opening the lift-off disk of the pressure-relief valve)
• Make sure that FP Turbo-pump is OFF. Turn OFF Turbo Pump chiller
• Turn off CRDCs chiller
• Vent all sections, including Spectrograph (assistance from vacuum group will be needed). IF this is not possible, make sure that this section is isolated (close gate valves upstream and downstream)
• Make sure that all sections are at atmospheric pressure

• Set all Brhos to 0 Tm
• Turn off all power supplies, including steerers

• Notify (e.g. email) Cryogenics that all magnets are off
• Check if there is any He lead return pipe open. If so, notify Magnet group and/or Cryogenics group so they can close it at their earliest convenience

• Turn off all crates in S800 rack (S3 vault)
• Turn off all crates in dU6
• Reboot s800fp PC (in S3)
• Reboot down u6pc5
• Reboot down spdaq50