Radiation of surface polaritons by an annular beam coaxially enclosing a cylindrical waveguide

IF 1.5 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-03-13 DOI:10.1016/j.nima.2025.170408

A.A. Saharian , G.V. Chalyan , L.Sh. Grigoryan , H.F. Khachatryan , V.Kh. Kotanjyan

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Abstract

We investigate the radiation of surface polaritons by an annular beam that coaxially encloses a cylindrical waveguide surrounded by a homogeneous medium. By using the Green dyadic, the electromagnetic potentials and the electric and magnetic fields are found inside and outside the waveguide. The expression for the energy losses is derived for the general case of the dispersion for dielectric permittivities inside and outside the cylinder. A comprehensive analysis is presented in the spectral range corresponding to the radiation of surface polaritons. The highest peaks in the spectral distribution are obtained for intermediate values of the beam velocity. In the limit of transparent medium the spectrum of radiated surface polaritons is discrete and the corresponding frequencies are determined by the eigenvalue equation for the cylindrical waveguide. Numerical examples are presented for the Drude model of dispersion.

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来源期刊

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment 物理-光谱学

CiteScore

3.20

自引率

21.40%

发文量

787

审稿时长

1 months

期刊介绍： Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary phenomena such as synchrotron radiation and free electron lasers. It also includes all types of instrumentation for the detection and spectrometry of radiations from high energy processes and nuclear decays, as well as instrumentation for experiments at nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also find their place in the A section. Theoretical as well as experimental papers are accepted.