6
• Open the plastic bag containing the transport container.1x Wall Power Supply (5V/3A)
• Remove the three pairs of nuts and screws holding the CEM.
• Carefully remove the CEM assembly by pulling the flange upwards. The cables and the CEM mount
may touch the opening, but do not rotate the assembly before the CEM funnel has fully cleared the
opening.
• Remove the viton gasket. Again, touching the cables or CEM mount with the gasket is not a problem,
but keep away from the CEM funnel.
The funnel at the front of the CEM should be protected from exposure to particle
contamination. While transporting the CEM outside the container keep the funnel
pointing downwards or inside a suitable container. Larger particles can be removed by
carefully using tweezers.
• Install the CEM by placing a copper gasket on the base flange and inserting the CEM assembly into an
appropriate DN40CF flange opening. Take care not to touch the walls or other obstacles with the CEM
funnel and do not pinch the cables between the flange edges.
• After installation of the CEM assembly, evacuate the chamber. This is a high-pressure channeltron, do
not perform bakeout.
• At this point, you can perform some basic resistance checks,
.
• Keep the transport container in case the CEM must be sent back for repair or modification. It can also
be used for storing the detector temporarily when not installed in a vacuum chamber.
A dry atmosphere/rough vacuum is recommended in both cases.
for additional information.
• High-Pressure channeltron assembly: Do not perform bakeout when using the
standard mount.
• Maximum operating temperature: 70 °C
• Maximum ambient pressure with high voltage applied: < 1E-3 mbar
Note
The CEMs should be kept under vacuum or in protective atmosphere if possible.
Alternatively use a dry atmosphere. Water contamination may change gain characteristics
over time. The best long term storage environment is an oil free vacuum in the 10E-2
mbar range or better. The transport container is not designed for a long term storage of
the CEMs.
