Gigawatt power microwave devices and vacuum

Stimulated Electron Desorption Studies from Microwave Vacuum Electronics / High Power Microwave Materials

Secondary electron emission (SEE) can potentially lead to beam instabilities, material degradation, beam closure (shorting or pulse shortening), and R.F. breakdown. Under certain conditions, SEE may be desired as a source of electrons for a high power microwave device. Material surface physics, morphology, and possibly the state of the material play a role in the emission process. This DEPSCoR ...

Fixed and Incremental Levels of Microwave Power Application on Drying Grapes under Vacuum

Microwave vacuum drying has been investigated as promising potential for high-quality dried fruits. In this study, a batch microwave vacuum dryer was used to understand the effect of levels of microwave power on the drying characteristics and moisture content of grapes. Thompson seedless grapes were treated 1st for 30, 60, and 90 min at fixed levels of 500, 750, 1000, 1250, and 1500 W at a redu...

Diamond vacuum field emission devices

This article reports the development of (a) vertical and (b) lateral diamond vacuum field emission devices with excellent field emission characteristics. These diamond field emission devices, diode and triode, were fabricated using a self-aligning gate formation technique from silicon-on-insulator wafers using conventional siliconmicropatterning and etching techniques. High emission current N0....

LiNbO3 devices for Microwave Photonics

A selection of microwave photonic systems using lithium niobate devices are presented. Systems include diplexers, variable phase shifters, filters and quadrature hybrids. Opportunities for monolithic integration are discussed.

Time-domain Finite Element Analysis of Nonlinear Breakdown Problems in High- Power-microwave Devices and Systems