Showing papers by "G. G. Denisov published in 2001"
61 citations
TL;DR: In this article, the authors investigated the reliability of the remote steering capability in realistic waveguide condition, where different factors could limit efficiency (RF breakdown, random technological spread of parameters, and heating of system), are simulated.
Abstract: An application of remote RF beam steering concept, based on image multiplication phenomena in a corrugated square waveguide, to electron-cyclotron plasma heating and current drive for ITER has been considered. In the present paper high attention is paid to studies of reliability of the remote steering capability in realistic waveguide condition. Different factors, could limit efficiency (RF breakdown, random technological spread of parameters, and heating of system), are simulated. Polarization properties of the remote steering antenna, arising due to non-ideal corrugation, are investigated. It is suggested a new configuration of antenna to be not sensible to corrugation parameters. RF analysis of the system, supplemented by dog-legs and a vacuum window, is also presented. A new way to use beating wave transmission in the remote steering waveguide is suggested, in order to reduce losses caused by mitre bends.
29 citations
TL;DR: In this paper, the authors studied the properties of two-dimensional Bragg resonators of planar geometry realising 2-D distributed feedback and showed that the resonators possess high selectivity over both longitudinal and transverse mode indexes and the eigenmodes spectrum is defined by the profile of the corrugated surface of the conductors forming the resonator.
10 citations
TL;DR: The Fusion-FEM experiment at the FOM-Institute for Plasma Physics (Rijnhuizen) as discussed by the authors was the first one to reach a pulse length of 100 ms.
5 citations
TL;DR: In this paper, the free-electron maser (FEM) at Rijnhuizen, a high-power mm-wave source, was used to tune the frequency over the entire range from 130 to 260 GHz at an output power exceeding 1 MW.
2 citations
TL;DR: For a free-electron oscillator, the authors in this paper showed that even a broadband frequency-dispersive feedback can significantly affect both the electron-current threshold of stability of the single-mode operation and the process of frequency tuning.
Abstract: For a free-electron oscillator, problems of mode dynamics are studied for a case when the feedback has a wide, but finite band (the feedback coefficient depends on the frequency). It is shown that even a broadband frequency-dispersive feedback can significantly affect both the electron-current threshold of stability of the single-mode operation and the process of frequency tuning.
2 citations