Abstract: The present disclosure provides a method for joining two materials, and a system for accomplishing the same. The method for joining two materials, in this aspect, includes placing an article including two dissimilar materials within a waveguide structure, the article located between a microwave source and reflective surface of the waveguide structure. The method for joining the two materials, in this aspect, further includes subjecting the article to microwaves from the microwave source while changing a relative position of the article with respect to the reflective surface to dynamically change a microwave field distribution within the waveguide and join the two dissimilar materials.

Abstract: An optically tunable cavity for an electronic device concurrently achieves high bandwidth (for example, at least about 10 percent, typically greater than about 50 percent) with high DC-RF efficiency (for example, at least about 50 percent, typically greater than about 85 percent). The electronic device may be a vacuum electronic device, including linear-beam and cross-field devices, with either an input circuit or an output circuit, or both, containing a photocapacitance-controlled resonator embedded such that a laser beam can impinge upon a semiconductor gap of the resonator. The laser beam may instantaneously change the resonant mode of the overall loaded cavity, thus allowing for amplification or oscillation of the desired frequency throughout the vacuum electronic device.

Abstract: An apparatus for use in a process to regulate power for a particle accelerator includes a first circulator, a second circulator, a tee coupled between the first and the second circulator, and a tuner coupled to the tee. An apparatus for use in a process to regulate power for a particle accelerator includes a first circulator, a second circulator, a 3-dB coupler coupled between the first and the second circulator, and a tuner coupled to the 3-dB coupler.

Abstract: A slow wave structure for coupling RF energy with an electron beam comprises a co-propagating RF section including a plurality of pins having a uniform separation from the plane of an electron beam axis. An output aperture is positioned a half wavelength from a reflection section comprising a change in depth of the pintles, such that RF energy reflected by the change in pintle depth is added to the RF energy traveling with the electron beam. One or more rows of pintles are removed in the region of the output aperture to enhance coupling to the output aperture. The device may include a beam shaper for shaping the electron beam to surround the pintles, and the beam shaper and pintles may share common channels which are longitudinal to the electron beam axis. The slow wave structure may operate in forward and backward wave modes, and may be used in conjunction with other structures to form amplifiers and oscillators.

Abstract: This invention provides tunable devices incorporating the dielectric CaCu3Ti4O12. CaCu3Ti4O12 is especially useful in tunable devices such as phase shifters, matching networks, oscillators, filters, resonators, and antennas comprising interdigital and trilayer capacitors, coplanar waveguides and microstrips.

Abstract: A device for use in a linear accelerator operable to accelerate charged particles along a beam axis. The device includes a first end section, a second end section, and a transition section interposed between the first and second end sections. The sections are coupled together to form a plurality of accelerating cavities aligned along the beam axis. The first and second sections are configured to operate in a fixed collective resonant mode and the transition section is tunable such that resonant modes of the transition section may be tuned to lie at generally the same frequency as the resonant mode of the first and second sections.

Abstract: The interaction structure with integral coupling and bunching section and method of use of the present invention produces backward wave oscillations in an RF structure which combines ballistic bunching and extended beam-wave interaction in a complex resonator assembly. The complex extended interaction structure includes a five-gap electromagnetically-coupled cavity structure with a coaxial section inserted between the first and second cavities. The first cavity serves as a buncher cavity while the four subsequent cavities serve as energy cavities. In the coaxial section, beam and wave propagate in separate channels. The field in the buncher cavity is coupled to the four subsequent energy extraction cavities through the wave channel between the inner and outer conductors of the coaxial section, while the electron beam drifts along a cylindrical channel cut through the inner conductor of the coaxial section.

Abstract: An optically tuned magnetron oscillator employs materials whose electrodynamic properties are altered by the absorption of light. A probe constructed from a leaky dielectric light guide coated with a photoconductive material is inserted into each of the magnetron's cavities. When light is injected into the light guide, it leaks into the coating where it is absorbed, creating free charge carriers whose presence alters the dielectric properties of the material, thereby perturbing the resonant frequency of the cavity. The frequency can be controlled by varying the amount of light injected into each of the optical probes. When no light is present, the resonant frequency of the magnetron cavity will be at one extreme of its operating band; when the light is at full intensity, the change in the properties of the probe will be maximum as will be the change in the resonant frequency.