Varian Associates

About: Varian Associates is a based out in . It is known for research contribution in the topics: Beam (structure) & Wafer. The organization has 2160 authors who have published 2591 publications receiving 46002 citations.

Compact microwave and millimeter wave amplifier

Abstract: An electronic device for amplifying microwave or millimeter wave signals. A microwave or millimeter wave input signal stimulates a gated field emission array to produce a density modulated beam of electrons containing about 1 billion to 1,000 billion bunches or pulses per second which in turn illuminates a thin diamond target in a diamond switch connecting a load to a high voltage source. Each electron in each pulse creates a large number of electron hole pairs in the diamond. The high voltage bias across the diamond causes most of the very large number of pairs to be swept through the diamond target producing a high current surge in less than one half the period of the designed output frequency. Induced RF currents are set up within the resonant output cavity in response to the current flowing within the diamond. In summary, each surge of current produces an electromagnetic pulse at the load. Thus, an electromagnetic millimeter wave is produced with a frequency equal to the frequency of the signal output.

Liquid development of electrostatic images

Abstract: In a liquid development station for developing electrostatic latent charge images on the charge retentive surfaces of recording media, a cylindrical development electrode is mounted for rotation adjacent the charge retentive surface of a recording medium to be developed. The cylindrical development electrode has a rough surface and is rotated with sufficient angular velocity such that the speed of the rough surface is faster than the speed of the moving charge image to be developed. Liquid electrographic toner is supplied to the rough surface of the rotating development electrode so as to be carried by the rotating rough surface into contact with the charge image to be developed.

Vaporizer system for ion source

Abstract: A vaporizer system for an ion source includes a radiation source positioned on the vaporizer axis for providing radiation, multiple crucibles radially spaced from the axis and circumferentially spaced from each other and a reflector rotatable about the axis for directing radiation from the source at a selected one of the crucibles. The radiation causes heating of the selected crucible and vaporization of a solid source material contained therein. The radiation source is a visible and/or infrared emitting lamp such as a quartz halogen lamp. The crucibles are thermally isolated from each other by a heat shield so that the selected crucible is heated while the others remain relatively cool.

Measurement of microwave characteristics of helix traveling wave circuits

Abstract: A measurement technique has been developed for accurately and rapidly measuring phase velocity, loss profile, and Pierce impedance in helix traveling wave circuits. This technique employs an Automatic Network Analyzer to control a perturbation measurement sequence which generates amplitude and phase information on the microwave signals in the circuits. These data are statistically reduced in the computer and hard copy of the results is produced automatically in the form of graphs and tables. Phase velocity measurements are repeatable to within ± 0.05% and Pierce impedance to within ± 5%. Loss profiles are typically tracked down to the -20 dB level. Dispersion characteristics are measured over wide frequency ranges including the stopband regions of lossless circuits. Resonant loss profiles have been successfully measured. All these measurements can be made on production helix circuits which typically are one-port devices.