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  • Pressure in oven too high
  • Pressure in oven too low
  • Loss of oven cooling water (over-temperature ~75 deg C)
  • Loss of beamline valve enable from MPS which may be due to one or more of:
    • Pressure high in FACET beamline
    • Differential Pumping System failure
    • Sector 19/20 access

The EPS closes the valve on the gas (helium bottle) when the pressure is too high.

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Note: MPS already has its own mechanical limit switches, independent of the EPS, that will prevent electron beam if the position is not bypass or oven.

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Expert Mode

An Expert mode is available for testing the control system and interlocks. This will be able to bypass conditions that allow the testing to proceed. There are no circumstances where it is foreseen that Expert mode will be entered during beam. Expert mode is controlled administratively. If you see the system in Expert mode and you did not expect this, stop. It is not safe to perform the experiment in Expert mode.

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