caa a22 4500 477059406 CHVBK 20180405111355.0 cr unu---uuuuu 170330e19961201xx s 000 0 eng 10.1007/BF02436163 doi (NATIONALLICENCE)springer-10.1007/BF02436163 Relativistic backward-wave tube with nonuniform phase velocity of the synchronous harmonic [Elektronische Daten] [S. Korovin, S. Polevin, A. Roitman, V. Rostov] We have investigated the possibility of increasing the efficiency of a moderately relativistic backward-wave tube (BWT) by longitudinal modification of the phase velocity profile of the synchronous (−1) spatial harmonic. We have shown theoretically that the efficiency of oscillators with a nonuniform electrodynamic system may reach 60% in the approximation of a near zero space-charge field. We have found that the use of nonuniform periodic structures leads to reduction of the critical value of the space-charge field, and also impairment of the adaptive properties of the device. In our experiments, we have realized backward-wave oscillators (BWO) with 40% efficiency and microwave radiation power of 500 MW. Plenum Publishing Corporation, 1997 Korovin S. aut Polevin S. aut Roitman A. aut Rostov V. aut Russian Physics Journal Kluwer Academic Publishers-Consultants Bureau 39/12(1996-12-01), 1206-1209 1064-8887 39:12<1206 1996 39 11182 https://doi.org/10.1007/BF02436163 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02436163 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Korovin S. aut NATIONALLICENCE 700 1- Polevin S. aut NATIONALLICENCE 700 1- Roitman A. aut NATIONALLICENCE 700 1- Rostov V. aut NATIONALLICENCE 773 0- Russian Physics Journal Kluwer Academic Publishers-Consultants Bureau 39/12(1996-12-01), 1206-1209 1064-8887 39:12<1206 1996 39 11182 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer