Title from the title-page.

[References: p. 227 (6 tit.)]

The concept of a hybrid antennaamplifier device, that is a combination of a surface wave antenna with a relativistic Cherenkov amplifier, is set out. The key feature of the device providing its potential for a compact controllable highpower microwave source is that a rod antenna feed waveguide serves, at the same time, as a hollow cathode holder of a diode producing a relativistic electron beam. This is possible if a beam is generated using a compact module of a linear induction accelerator (LIA). The results obtained in the scope of exploration of this concept are reported. This includes the linear theory, 1-D nonlinear multimode theory, design of the LIA module, initial results of the 3-D simulations using the MAGIC code, and first results of model experiments on annular beam transport with a rod antenna inside.

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