Abstract: Standing-wave linear accelerators (linac) having a plurality of accelerating cavities and which do not have any auxiliary cavities are provided. Such linacs are useful for industrial applications such as radiography, cargo inspection and food sterilization, and also medical applications such as radiation therapy and imaging. In one embodiment, the linac includes an electron gun for generating an electron beam, and a plurality of accelerating cavities which accelerates the electron beam by applying electromagnetic fields generated by a microwave source. At least two adjacent accelerating cavities of the plurality of accelerating cavities are coupled together by at least one resonant iris. The electromagnetic fields resonate through the plurality of accelerating cavities and the at least one resonant iris.

Abstract: Standing-wave linear accelerators (linac) having a plurality of accelerating cavities and which do not have any auxiliary cavities are provided. Such linacs are useful for industrial applications such as radiography, cargo inspection and food sterilization, and also medical applications such as radiation therapy and imaging. In one embodiment, the linac includes an electron gun for generating an electron beam, and a plurality of accelerating cavities which accelerates the electron beam by applying electromagnetic fields generated by a microwave source. At least two adjacent accelerating cavities of the plurality of accelerating cavities are coupled together by at least one resonant iris. The electromagnetic fields resonate through the plurality of accelerating cavities and the at least one resonant iris.

Abstract: Some embodiments include an accelerator waveguide to receive RF power, the accelerator waveguide comprising a side cavity, an element fixedly disposed within the side cavity, and a device coupled to the element, wherein the device and the element are operable to control a resonant frequency of the side cavity.

Abstract: An improved method, system, and apparatus for tuning a particle accelerator is provided which includes tuning side cavities while placing adjancent cavities in a de-tuned condition. A conductor is positioned such that a primary cavity under test is minimally excited, while adjacent side cavities are excited. Coupled modes are measured. The primary cavity is tuned based on the measured coupled modes. According to the invention, this tuning is accomplished without use of access ports to the interior of the side cavities.

Abstract: An improved method, system, and apparatus for tuning a particle accelerator is provided which includes tuning side cavities while placing adjancent cavities in a de-tuned condition. A conductor is positioned such that a primary cavity under test is minimally excited, while adjacent side cavities are excited. Coupled modes are measured. The primary cavity is tuned based on the measured coupled modes. According to the invention, this tuning is accomplished without use of access ports to the interior of the side cavities.

Abstract: A method and apparatus for diffracting magnetostatic waves (MSW) in a garnet film by surface acoustic waves (SAW) so that spectral analysis may be performed on an input microwave signal having a plurality of frequency components. The garnet film, advantageously a YIG film, has a piezoelectric layer of zinc oxide which receives at an interdigital transducer an rf signal to propagate surface acoustic waves (SAW) in the YIG film. The SAW space and time modulates the properties of the YIG film as to diffract magnetostatic waves. A microwave input signal having a plurality of spectral components is supplied to the YIG film, as is a magnetic biasing field, whereby MSW propagates therein. Because of the diffraction of MSW caused by SAW, different spectral components of the microwave signal are obtained at different positions and are output at individual channels.

Abstract: A coupled YIG resonator device for filtering a wide band microwave signal to provide a comparatively narrow output passband. The device has an enhanced bandwidth and improved out-of-band rejection relative to a single resonator configuration. The coupled resonator device includes a plurality of YIG films sharing a common non-magnetic substrate arranged in a plane and having a gap separating adjacent films. A dielectric layer has a first surface in contact with the YIG films and a second surface where a metallic ground plane is deposited. A magnetic biasing field is applied to the plurality of YIG films such that each forms a resonator having a resonance frequency. Adjacent resonators are magnetically coupled to each other by rf linkage across the gap therebetween.