Abstract: An electron multiplier includes a micro-channel plate (12) having secondary electron emission. The channel plate is fitted in an annular metal frame (16, 17) which is in direct electrical contact with one (13) of the metallizations (13, 14) on the faces of the channel plate. The frame constitutes the means to apply an electric potential to one of the faces of the channel plate. The means to apply an electric potential to the other face of the channel plate are constituted by metallic contact studs (25) fixed in an insulated manner on the metallic frame and connected to the metallization (14) of the other face by means of conductor wires (30). The multiplier is incorporated in a detector device, the frame being soldered to the body (45) of the device by means of rods (48) traversing the body and soldered thereto.

Abstract: A display device with a cooling circuit in the screen to limit the rise in temperature of the luminescent material, particularly during strong current densities of the electron beam. The device comprises a window formed of an optical fiber plate of which one or several cladding glasses have been partially removed in order to form channels for the passage of a cooling liquid while maintaining studs comprising light conductors formed by the glass core surrounded by a cladding glass of the optical fiber plate. A transparent display window having a luminescent layer is glued or sealed to the window thus constituting a cooling network connected to an external circulation by pipes embedded in moulding tubes.