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.

Simulation of space-charge effects on velocity spread in gyro devices

Abstract: The effects of space-charge field on velocity spread in the drift tube regions of gyro devices which use either magnetron injection guns (MIG) or Pierce gun/wigglers (PW) are investigated using computer simulation codes. It is shown that changes in velocity spread occur while the beam makes a transition from an essentially coherent laminar state to an incoherent mixed state.

A millimeter-wave tunneladder TWT

Abstract: A millimeter-wave TWT was developed using a dispersive, high-impedance "forward wave" interaction structure based on a ladder, with non-space-harmonic interaction, for a tube with high gain per inch and high efficiency. The "TunneLadder" interaction structure combines ladder properties modified to accommodate Pierce-gun beam optics in a radially magnetized PH focusing structure. The development involved the fabrication of chemically milled, shaped ladders diffusion brazed to diamond cubes which are in turn active-diffusion brazed to each ridge of a doubly ridged waveguide. Cold-test data are presented, representing the \omega-\beta and impedance characteristics of the modified ladder circuit. These results were used in small- and large-signal computer programs to predict TWT gain and efficiency. Actual data from tested tubes verify the predicted performance while providing broader bandwidth than expected.

Gaseous discharge device

Abstract: The invention relates to the production of radiant energy by a generator employing a gaseous discharge envelope energized by high frequency current, and the invention is particularly adaptable for use in generating electro-magnetic waves between 1.4 and 1,000,000 Angstrom units. One object...