TY - JOUR

T1 - Diffraction at the Open-Ended Dielectric-Loaded Circular Waveguide

T2 - Rigorous Approach

AU - Galyamin, Sergey N.

AU - Vorobev, Victor V.

AU - Tyukhtin, Andrey V.

N1 - S. N. Galyamin, V. V. Vorobev and A. V. Tyukhtin, "Diffraction at the Open-Ended Dielectric-Loaded Circular Waveguide: Rigorous Approach," in IEEE Transactions on Microwave Theory and Techniques, vol. 69, no. 5, pp. 2429-2438, May 2021, doi: 10.1109/TMTT.2021.3064343.

PY - 2021/5/1

Y1 - 2021/5/1

N2 - An elegant and convenient rigorous approach for solving canonical circular open-ended dielectric-loaded waveguide diffraction problems is presented. It uses the solution of corresponding Wiener-Hopf-Fock equation and leads to an infinite linear system for reflection coefficients (S-parameters) of the waveguide, and the latter can be efficiently solved numerically using the reducing technique. As a specific example directly applicable to beam-driven radiation sources based on dielectric-lined capillaries, diffraction of a slow TM symmetrical mode at the open end of a circular waveguide with uniform dielectric filling is considered. A series of such modes forms the wakefield (Cherenkov radiation field) generated by a charged particle bunch during its passage along the waveguide axis. Calculated S-parameters were compared with those obtained from COMSOL simulation and an excellent agreement was shown. This method is expected to be very convenient for analytical investigation of various electromagnetic interactions of terahertz (THz) waves (both free and guided) and charged particle bunches with slow-wave structures perspective in context of modern beam-driven THz emitters, THz accelerators, and THz-based bunch manipulation and bunch diagnostic systems.

AB - An elegant and convenient rigorous approach for solving canonical circular open-ended dielectric-loaded waveguide diffraction problems is presented. It uses the solution of corresponding Wiener-Hopf-Fock equation and leads to an infinite linear system for reflection coefficients (S-parameters) of the waveguide, and the latter can be efficiently solved numerically using the reducing technique. As a specific example directly applicable to beam-driven radiation sources based on dielectric-lined capillaries, diffraction of a slow TM symmetrical mode at the open end of a circular waveguide with uniform dielectric filling is considered. A series of such modes forms the wakefield (Cherenkov radiation field) generated by a charged particle bunch during its passage along the waveguide axis. Calculated S-parameters were compared with those obtained from COMSOL simulation and an excellent agreement was shown. This method is expected to be very convenient for analytical investigation of various electromagnetic interactions of terahertz (THz) waves (both free and guided) and charged particle bunches with slow-wave structures perspective in context of modern beam-driven THz emitters, THz accelerators, and THz-based bunch manipulation and bunch diagnostic systems.

KW - Diffraction radiation

KW - open-ended waveguide

KW - Wiener-Hopf technique

KW - Diffraction

KW - Loading

KW - Electromagnetic waveguides

KW - Waveguide theory

KW - Dielectrics

KW - Mathematical model

KW - RADIATION

KW - Optical waveguides

UR - http://www.scopus.com/inward/record.url?scp=85103233398&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/f2339ba2-7333-3b64-b314-5350679b71a0/

U2 - 10.1109/TMTT.2021.3064343

DO - 10.1109/TMTT.2021.3064343

M3 - Article

AN - SCOPUS:85103233398

VL - 69

SP - 2429

EP - 2438

JO - IEEE Transactions on Microwave Theory and Techniques

JF - IEEE Transactions on Microwave Theory and Techniques

SN - 0018-9480

IS - 5

M1 - 9382413

ER -