Traveling-Wave Tubes

Pierce, John R.; Field, L. M.

doi:10.1109/jrproc.1947.226216

Cited by 123 publications

(17 citation statements)

References 1 publication

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“…1,2 The free electron laser can operate in a wide frequency range from the microwave to the x-ray regions, but it requires a very high acceleration voltage exceeding 10-1000 MV and a large experimental setup. 3,4 The Cherenkov laser has the possibility of operation at a relatively low voltage with a compact size.…”

Section: Introductionmentioning

confidence: 99%

Optical emission from a high-refractive-index waveguide excited by a traveling electron beam

Kuwamura

Yamada

Okamoto

et al. 2008

Journal of Applied Physics

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An optical emission scheme was demonstrated, in which a high-refractive-index waveguide is excited by a traveling electron beam in a vacuum environment. The waveguide was made of Si-SiO 2 layers. The velocity of light propagating in the waveguide was slowed down to 1/3 of that in free space due to the high refractive index of Si. The light penetrated partly into the vacuum in the form of a surface wave. The electron beam was emitted from an electron gun and propagated along the surface of the waveguide. When the velocity of the electron coincided with that of the light, optical emission was observed. This emission is a type of Cherenkov radiation and is not conventional cathode luminescence from the waveguide materials because Si and SiO 2 are transparent to light at the emitted wavelength. This type of emission was observed in an optical wavelength range from 1.2 to 1.6 m with an electron acceleration voltage of 32-42 kV. The characteristics of the emitted light, such as the polarization direction and the relation between the acceleration voltage of the electron beam and the optical wavelength, coincided well with the theoretical results. The coherent length of an electron wave in the vacuum was confirmed to be equal to the electron spacing, as found by measuring the spectral profile of the emitted light.

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Section: Introductionmentioning

confidence: 99%

Optical emission from a high-refractive-index waveguide excited by a traveling electron beam

Kuwamura

Yamada

Okamoto

et al. 2008

Journal of Applied Physics

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“…When designing a SWS, the most important parameters to take into account are: (1) phase velocity and (2) interaction. The latter is usually referred as Pierce [27] impedance, and it is given by:…”

Section: Perspectives On Scaling Down the Existing Microwave Devicesmentioning

confidence: 99%

Compact tunable terahertz source: perspectives on planar configurations

et al. 2009

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In the last decade there has been an increasing interest for terahertz technology. The reasons of this increasing interest is mainly due to its potential use in security applications with particular reference to drug and explosive detection. In this framework, the appropriate integration of metamaterials with nanotechnologies looks very promising for the construction of new compact low cost devices. Following this line of argument, we are exploring the possibility to combine the use of nanocathodes as sources of electron beams with engineered metamaterial layers in order to deliver coherent tunable terahertz radiation. More exactly, starting from a revised design of microwave sources, we discuss the issues related to manufacture miniaturized planar devices taking advantage of some appropriate integration of post silicon technologies.

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“…The low-impedance (10). Since then, a large class of broadband and high-performance traveling-wave electronic devices has been proposed doped semiconductor, which is a nonmagnetic material, is virtually invisible to the magnetic field.…”

Section: Fundamentals Of Slow-wave Structuresmentioning

confidence: 99%

Slow Wave Structures

1999

Wiley Encyclopedia of Electrical and Electronics Engineering

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The sections in this article are Guided Waves and Waveguides Fundamentals of Slow‐Wave Structures A Brief History of Slow‐Wave Development Basic Theory of Slow‐Wave Structure (ω − β) Dispersion Diagram and Slow‐Wave Parameters Approximate and Quasi‐Static Models Accurate and Hybrid‐Mode Field Models Slow‐Wave Summary and Applications

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Traveling-Wave Tubes

Cited by 123 publications

References 1 publication

Optical emission from a high-refractive-index waveguide excited by a traveling electron beam

Optical emission from a high-refractive-index waveguide excited by a traveling electron beam

Compact tunable terahertz source: perspectives on planar configurations

Slow Wave Structures

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