Unpowered vs Masked

Unpowered

• CED property, set there and ported into SRM/HCO
• When set, component/element/device does not appear on EDM screens
• Use for components/beamline elements/devices that are not intended to be used during the Physics run
• HCO/SRM group sign-offs still available (i.e. groups can sign Not Ready, Checked, Ready)
• Completing HCO on an unpowered device/component/element is like doing an inversehot-checkout where you verify that in no way can the thing affect beam in any way

Masked

• HCO/SRM property only, not set or read by CED
• Must be entered with an expiration date
• When a component is masked, all group sign-offs for the component are masked; when the component is unmasked (either by expiration or user), all group sign-offs go to Not Ready
• Masks are for components that are broken or out-of-service and need repair. The mask expiration is the date by which they will be addressed, or the end of the run, whichever comes first.
• Credited Controls, show-stopper, or critical components never get masked
• You can have an unpowered masked component, meaning it is both broken/out-ofservice with repair planned, and do not want it showing up on EDM / control screens
• We do not want any vacuum elements hidden on screens, regardless of if they have had their controls removed
• If the device works after a standard HCO, but we do not intend to use if for the upcoming run, and its controls have been removed, it should not be masked, just marked Unpowered