Plasma influence on the electromagnetic properties of coupled-cavity slow wave structures

The electromagnetic characteristics of model coupled-cavity slow wave structures (CC SWS) are investigated. Resonant methods with shorted SWS are attractive for measuring the characteristics. The research was performed in two steps. The first step was the cold test of spatially periodic structure (empty CC SWS). In the second step, the hybrid model based on CC SWS with special gas-discharge tube introduced into the channel is investigated. The hybrid mode results from the coupling of the "vacuum" fields in the cavities with a plasma mode, which exists in a narrow drift channel. This test of plasma loaded CC SWS is named "warm" test.