Travelling Modes in Wave-Heated Plasma Sources

Abstract

Abstract-This paper describes a theoretical and experimental study of surface-and helicon-wave-heated plasma sources in which standing waves are set up in the cavity between the closed end plate to a plasma vessel and a wave launcher while travelling waves propagate from the opposite side of the launcher into a region which is long compared with the attenuation distance of the waves. We model the situation as a lossy transmission line of finite length coupled at the launcher to a lossy transmission line of infinite extent. RF power applied to the launcher divides in the ratio of the input impedances of the two transmission lines. For a conducting end plate, the power delivered to the travelling waves is a maximum when the cavity length is an odd number of 1/4 wavelengths long for which its input impedance is a maximum. Similarly, for an insulated end plate, the power delivered to the travelling waves is a maximum for a cavity with a length equal to an integer number of half wavelengths for which its input impedance is again a maximum.

Study of Earth-Fault Location Method for Distribution Network Based on Transient Signal

“…Generating and Forming Process of Earth-Fault Transient Signal. When earth-fault occurs in distribution network, according to traveling wave theory in transmission line [3], the fault point equals to join a virtual voltage source which has opposite phase and equal amplitude comparing with voltage source before fault. The voltage source generating traveling wave propagates along both sides of transmission line, and the traveling wave occurs multiple refractions and reflections.…”