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The effect of MCP outgasing can be reduced by running a degas procedure. To do so the detector must be
operated at a high count rate of about 10Mcps for a time period of about 8 hours.
8.6 MCP Degase Procedure
It is really important that the detector is irradiated homogeneously over the complete
active area. Otherwise the MCPs will degenerate at various positions differently, which
will lead to an inhomogeneous flat field of the detector.
Operate the detector continuously until the pressure increase has reduced significantly to an acceptable
pressure range (this will take quite a while, especially with new MCPs). Then switch to the final application.
The pressure increase for the smaller count rate should now be much smaller. The detector will be delivered
already pre-conditioned. Unfortunately the degas procedure must be started anew (to a certain extend)
after each venting of the detector.
8.7 Replacement
Please contact your provider before performing any MCP replacement. We will provide you with a detailed
step by step description.
Please take care to note the orientation of the MCPs. The channels in the MCPs include a certain angle
against the surface normal to the plate and the MCPs must be mounted in a chevron or z-stack configuration
(depending on number of MCPs in the detector). All parts of the detector, especially the MCPs should be
handled with great care. The MCP surfaces are very sensitive and should never be touched or scratched.
Contact your provider before performing a replacement.
Note
DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH
