In the last years many numerical techniques and CAD tools have been developed in order to characterize the electromagnetic response of microwave devices such as filters or resonators. On the other hand, today applications also demand a higher component integration as well as more power hadling capabilities. Both requeriments lead to higher electromagnetic field densities inside the devices whic...

This paper presents a theoretical study of the interaction of a 6 ps laser pulse with uncoupled and plasmon-coupled gold nanoparticles. We show how the one-dimensional assembly of particles affects the optical breakdown threshold of its surroundings. For this purpose we used a fully coupled electromagnetic, thermodynamic and plasma dynamics model for a laser pulse interaction with gold nanosphe...

Space borne radio frequency (RF) systems must cope with hard qualification procedures, including the evaluation of high-power handling capability equipment for space applications. Whatever electrical parameter is being measured, general rule thumb throughout a verification process to check whether system can operate up certain thresholds, which are defined ensure total reliability mission along...

A brief description of multipactor is followed by a discussion of design parameters for a titanium sublimation system. Efforts to correlate operating parameters (time, temperature, etc.) with thickness of coated titanium are reported. Rutherford backscattering thickness measurements are described and reported.

The results of experimental studies on the breakdown noble gases (argon and krypton) by terahertz radiation from Novosibirsk free electron laser (NovoFEL) are presented. For first time, thresholds were measured in a wide pressure range (0.2-1.5 bar). Previous experiments to measure THz various carried out for hundreds GHz or at atmospheric pressure. Experimental compared with calculated data us...

A model of a squeezer has been built and experiments are being made (see Fig. VIII-1). A 10-kv pulsed shielded cathode gun of perveance 106 is used to form the beam. The output cavity is very heavily loaded so that it can be used as an "ammeter" (low-impedance) to measure beam current. A polystyrene double-slug tuner allows us to vary the gap impedance over a range of approximately 36:1. The be...

The distributions of normal and tangential components of secondary electron velocity are found from known experimental data. These distributions are used for calculation of position, width and relative intensity of multipactor discharges zones. The calculations are performed for the vacuum waveguide of the CESR RF system.