31 results about "Relativistic electron beam" patented technology

Methods and apparatus are provided for modifying a free electron laser (FEL) to produce a non-diverging laser beam. A relativistic electron beam is converted to a Bessel beam in an FEL resonator with conical end mirrors, and the Bessel beam is coupled to the optical field within the laser resonator. The resultant laser beam is propagated with minimal divergence, and is wave corrected at the resonator output to produce a uniform intensity circular beam. The laser beam can be of smaller diameter than that of a conventional resonator due to its diffractionless propagation, which enables the magnetic structure gap within the resonator to be smaller, thus producing a higher optical gain.

The invention provides a small gamma ray source based on an all-optical laser plasma accelerator. The ray source includes a synchronous dual-output high-power laser system (200), a dual compression-delay system (12), a laser plasma accelerator (18), a particle beam focusing system (24), a scattered light focusing mirror (27) and a particle beam separate system. Wherein, an initial laser pulse is separated and amplified by the laser system (200) to generate two synchronous high-energy laser pulses (10, 11), and the two amplified laser pulses pass through a double compression-delay system (12) at Compressed in the time domain and appropriately delayed to form a pair of driving pulses (13)-scattering pulses (14), the driving pulses (13) pass through a laser plasma accelerator (18) to generate relativistic electron beams (21), particle beams The focusing system (24) is used to transmit the electron beam (21), the scattered light focusing mirror (27) is used to focus the scattered pulse (14) on the electron beam (21) to generate gamma rays (31), and the separation system is used to The electron beams (21) and gamma rays (31) are separated.

The invention discloses a non-relativistic electron beam induced dielectric waveguide-based terahertz radiation source. The non-relativistic electron beam induced dielectric waveguide-based terahertz radiation source includes a pulse laser light source used for emitting a laser pulse string, a frequency adjusting device used for adjusting the repetition frequency of the laser pulse string, an electron gun and a dielectric waveguide; the cathode of the electron gun is used for absorbing the laser pulse string and transmitting an electron beam cluster string; a size-adjustable electric field formed between the cathode and anode of the electron gun is used for accelerating the emitting of the electron beam cluster string into the dielectric waveguide; the dielectric waveguide is excited by the electron beam cluster string to form terahertz radiation; and the repetition frequency of the laser pulse string and the radiation frequency of the dielectric waveguide form resonance. With the non-relativistic electron beam induced dielectric waveguide-based terahertz radiation source adopted, energy conversion efficiency between the electrons and radiations of the terahertz radiation source can be effectively improved, radiation power can be improved, radiation frequency is adjustable. The cost of the terahertz radiation source can be reduced.

The invention relates to a fiber array cathode, and belongs to the field of a microwave source in the technical field of high-power microwaves. The fiber array cathode is formed by sleeving fiber bundle circumference arrays composed of porous array circular rings, U-shaped fiber bundles and circumference pads on a cathode substrate, wherein the two ends of each U-shaped fiber bundle are exposed at the side surface of a cathode to form a dense fiber array so as to replace velvet in a conventional cathode, the porous array circular rings have structural support and current conduction effects, and the dense fiber arrays formed by the fiber bundles mainly generate cathode plasma under the effect of a strong electric field and accordingly generate relativistic electron beams. The employed fiber bundles are generally carbon fiber bundles, glass fiber bundles or ceramic fiber bundles, or other materials with low emission thresholds and high temperature ablation resistance. Since the employed fiber bundle materials are better in high temperature ablation resistance than chemical fiber velvet in the conventional cathode, by use of the long-life fiber array cathode with the high temperature ablation resistance, the operation life of a MILO can be greatly prolonged.

The invention discloses a cold cathode capable of generating multiple cylindrical intense relativistic electron beams. The cold cathode comprises a cylindrical structure which is made of a metal material high in conductivity and emission threshold and has the same outer diameter, and a cathode rod, a cathode rod transition ring, a cathode rod transition section, a cathode seat, a cathode column and a cathode bulb which are all coaxial and in excellent electric connection with each other. Due to even distribution of the surface field of the cathode bulb serving as an emitting component in the cold cathode, the cold cathode has even electron emission density and the emitted multiple cylindrical electron beams are distributed symmetrically about the own centers, respectively; under the action of an appropriate guide magnetic field, the electron beams are not prone to collide with the wall of a multiple-beam drift tube due to that the electron beams rotate around the own centers in the transmission process in the drift tube; the transmission efficiency is high, the space configuration of the electron beams in the drift tube is kept unchanged, and the beam conversion efficiency is improved.