Cathode flanges are components used in vacuum systems, especially electron-beam devices such as cathode-ray tubes (crt) or electron microscopes. It is a metal flange that acts as a support and connection point for the cathode, which is the electron emitting electrode in these devices.

In a crt, the cathode flange is connected to the electron gun assembly, which generates and focuses the electron beam. It provides electrical contact to the cathode, allowing current to flow and electrons to be emitted. The flange also helps dissipate the heat generated by the cathode.

In electron microscopy, the cathode flange is part of the electron source assembly. It provides mechanical support for the cathode and allows for precise alignment of the electron beam.

Cathode flanges are essential components in electron beam devices, providing structural support, electrical connection and heat dissipation for cathodes.