Design of mm-wave slow-wave devices with sheet and hollow electron beams

A.E Fedotov,P.B Makhalov,V.N Manuilov,V.L Bratman,A.A Silaev

doi:10.1051/epjconf/201819501026

A.E Fedotov, P.B Makhalov + Show 3 more

Open Access

https://doi.org/10.1051/epjconf/201819501026

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Abstract

The frequency increase of the slow-wave electron devices is accompanied by inevitable increase of the electron current density and ohmic losses which strongly restricts the attainable power. In recent years, the use of the spatially-developed sheet electron beams is considered as the major way to develop the medium-power slow-wave devices at mm and sub-THz waves. Hollow electron beams is another configuration which could be used for this purpose. The designs of the oscillators and amplifiers in Ka-band and W-band with both sheet and hollow electron beams are considered and compared.

Highlights

The development of the powerful amplifiers in the millimeter and sub-terahertz wavelength ranges is one of the most topical problem in vacuum microwave electronics
Millimeter-wave amplifiers with an output power of several hundred watts are of interest for spectroscopy, telecommunications, remote sensing, and as preamplifiers for even more powerful gyro-amplifiers
In order to alleviate the thermal regime of the devices, a use of planar sheet electron beams for millimeter-wave traveling wave tubes (TWT) and extended-interaction klystrons (EIK) are extensively studied in recent years [1,2,3]

Summary

Introduction

The development of the powerful amplifiers in the millimeter and sub-terahertz wavelength ranges is one of the most topical problem in vacuum microwave electronics. The difficulty of development of traveling wave tubes (TWT) and extended-interaction klystrons (EIK) with the required parameters is caused largely by a very high required beam current density (up to 1 kA / cm2) if conventional electron beam with pencil-like configuration is used. Due to evanescent nature of the synchronous space harmonic of the operating mode, this beam with high energy density should be guided in close proximity to the surface of the slow-wave structure in order to provide efficient electron-wave interaction.

Results

Conclusion