Abstract: A device attenuates an electromagnetic pulse generated in an installation in which a high-power laser beam is sent to a target mounted on a target support. The device includes an electrically conductive plate, electrically connected to an electric earth of the installation and to which the target support is fixed, a plate of material which absorbs electromagnetic waves fixed to one face of the electrically conductive plate located on the target support side and a device for passing a discharge current, which is the result of an interaction of the laser beam with the target, between the target and the electrically conductive plate, where the device for passing the discharge current is equipped with a device for attenuating the current.

Abstract: A microwave wave generator device with oscillating virtual cathode, with axial geometry, includes at least one first reflector positioned in a cylindrical waveguide downstream of a thin anode, positioned at the entrance of the cylindrical waveguide, between a cathode and the cylindrical waveguide. The device further includes a tight magnetic ring of width (LM) along the longitudinal axis (z), positioned externally around the cylindrical waveguide, between the thin anode and the first reflector.

Abstract: A microwave wave generator device with oscillating virtual cathode, with axial geometry, includes at least one first reflector positioned in a cylindrical waveguide downstream of a thin anode, positioned at the entrance of the cylindrical waveguide, between a cathode and the cylindrical waveguide. The device further includes a tight magnetic ring of width (LM) along the longitudinal axis z, positioned externally around the cylindrical waveguide, between the thin anode and the first reflector.

Abstract: A device for generating microwaves with an oscillating virtual cathode includes a cathode, and a thin anode positioned at an inlet of a cylindrical waveguide (5). The waveguide includes at least one first open reflector and one last open reflector that are transparent to electrons and capable of reflecting a microwave created by at least one virtual cathode generated in the waveguide. A plurality of open reflectors are between the first and last open reflector, such that a designated reflector of the plurality of open reflectors has a radius R(i?1) less than or equal to a radius Ri of an immediately preceding reflector and the last open reflector has a radius RN less than a radius R1 of the first open reflector.

Abstract: A device attenuates an electromagnetic pulse generated in an installation in which a high-power laser beam is sent to a target mounted on a target support. The device includes an electrically conductive plate, electrically connected to an electric earth of the installation and to which the target support is fixed, a plate of material which absorbs electromagnetic waves fixed to one face of the electrically conductive plate located on the target support side and a device for passing a discharge current, which is the result of an interaction of the laser beam with the target, between the target and the electrically conductive plate, where the device for passing the discharge current is equipped with a device for attenuating the current.

Abstract: A device for generating microwaves with an oscillating virtual cathode includes a cathode, and a thin anode positioned at an inlet of a cylindrical waveguide. The waveguide includes at least one first open reflector and one last open reflector that are transparent to electrons and capable of reflecting a microwave created by at least one virtual cathode generated in the waveguide. A plurality of open reflectors are between the first and last open reflector, such that a designated reflector of the plurality of open reflectors has a radius R(i+1) less than or equal to a radius Ri of an immediately preceding reflector and the last open reflector has a radius RN less than a radius R1 of the first open reflector.