RuPAC2016 - List of Authors (Tyukhtin, A.V.)

Paper	Title	Page
TUPSA049	Electromagnetic Field in Dielectric Concentrator for Cherenkov Radiation	316
	S.N. Galyamin, A.A. Grigoreva, A.V. Tyukhtin, V.V. Vorobev Saint Petersburg State University, Saint Petersburg, Russia E.S. Belonogaya LETI, Saint-Petersburg, Russia
	Funding: Work was supported by the Grant of the President of Russian Federation (No. 6765.2015.2) and the Grant from Russian Foundation for Basic Research (No. 15-32-20985). Recently we have reported on axisymmetric dielectric concentrator for Cherenkov radiation that focuses almost the whole radiation in the vicinity of the given point (focus) located on the trajectory of the charge. Particularly, we have shown that this structure can increase the field up to two orders of magnitude. In this report we continue investigation of this concentrating target and analyse in more detail the field near the focal point depending on parameters of the target. S.N. Galyamin and A.V. Tyukhtin, Phys. Rev. Lett., 113, 064802 (2014).
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WEPSB034	The Electromagnetic Field Structure in the Circular Waveguide with Transverse Boundary	434
	A.A. Grigoreva Saint-Petersburg State University, Saint-Petersburg, Russia S.N. Galyamin, A.V. Tyukhtin, V.V. Vorobev Saint Petersburg State University, Saint Petersburg, Russia
	Funding: This work was supported by Russian Foundation for Basic Research under Grant 15-02-03913. The study of the electromagnetic field in a circular waveguide having a partial dielectric filling is of interest for a series of applications including new methods of particle acceleration. We consider the structure of the electromagnetic field in the circular waveguide which consists of two semi-infinite parts. One of them is empty and the other one has a cylindrical dielectric layer and a coaxial vacuum channel. Incident electromagnetic field is a symmetrical TM mode launching either from the vacuum part or from the partially dielectric part. Such mode can be excited by a particle bunch moving along the waveguide axis. The analytical investigation of reflected and transmitted fields is performed. On the basis of this study, we develop an algorithm for numerical calculation and demonstrate properties of waveguide modes excited because of presence of transversal boundary. Moreover we perform direct numerical simulation using Comsol Multiphysics. The comparison of results of our algorithm with simulations is given, and the good agreement between both methods is demonstrated.
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WEPSB068	Radiation From Open-Ended Flanged Waveguide With Dielectric Loading	515
	V.V. Vorobev, S.N. Galyamin, A.A. Grigoreva, A.V. Tyukhtin Saint Petersburg State University, Saint Petersburg, Russia
	Funding: The work is supported by the Grant of the President of Russian Federation (No. 6765.2015.2) and the Grants from Russian Foundation for Basic Research (No. 15-32-20985, 15-02-03913). Terahertz radiation is considered as a promising tool for a number of applications. One possible way to emit THz waves is to pass short electron bunch through a waveguide structure loaded with dielectric. Previously we considered the extraction of radiation from the open end of the waveguide with dielectric loading in both approximate and rigorous formulation. We also developed a rigorous approach based on mode-matching technique and modified residue-calculus technique for the case when the waveguide with dielectric is co-axial with infinite waveguide with greater radius. The study presented is devoted to the case when the dielectric loaded waveguide has a flange and enclosed into another waveguide with a greater radius. The case of the flanged waveguide in the unbounded vacuum space can be described as the limiting case of the problem under consideration. We perform analytical calculation (based on mode-matching technique and modified residue-calculus technique) and direct numerical simulation.
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WEPSB069	Radiation of a Bunch Flying from the Open End of a Waveguide with a Dielectric Loading	518
	S.N. Galyamin, A.V. Tyukhtin, V.V. Vorobev Saint Petersburg State University, Saint Petersburg, Russia A. Altmark, S. Baturin LETI, Saint-Petersburg, Russia
	Funding: Work is supported by the Grant of the President of Russian Federation (No. 6765.2015.2) and the Grant from Russian Foundation for Basic Research (No. 15-32-20985). In this paper we proceed with our investigation of Terahertz emission from beam moving in waveguide structures with dielectric layer. Recently we have considered an open-ended waveguide (with uniform dielectric filling) placed inside regular vacuum waveguide of a larger radius and excited by a single incident waveguide mode. Here we present analytical results for the case where the structure is excited by a moving charge. We also perform simulations using CST® PS code and compare results. S.N. Galyamin, A.V. Tyukhtin, S.S. Baturin, S. Antipov, Opt. Express 22(8) 8902 (2014). ** S.N. Galyamin, A.V. Tyukhtin, S.S. Baturin, V.V. Vorobev, A.A. Grigoreva, in Proc. IPAC'16, pp. 1617-1619.
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Paper

Title

Page

Electromagnetic Field in Dielectric Concentrator for Cherenkov Radiation

316

S.N. Galyamin, A.A. Grigoreva, A.V. Tyukhtin, V.V. Vorobev
Saint Petersburg State University, Saint Petersburg, Russia
E.S. Belonogaya
LETI, Saint-Petersburg, Russia

Funding: Work was supported by the Grant of the President of Russian Federation (No. 6765.2015.2) and the Grant from Russian Foundation for Basic Research (No. 15-32-20985).
Recently we have reported on axisymmetric dielectric concentrator for Cherenkov radiation that focuses almost the whole radiation in the vicinity of the given point (focus) located on the trajectory of the charge*. Particularly, we have shown that this structure can increase the field up to two orders of magnitude. In this report we continue investigation of this concentrating target and analyse in more detail the field near the focal point depending on parameters of the target.
* S.N. Galyamin and A.V. Tyukhtin, Phys. Rev. Lett., 113, 064802 (2014).

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WEPSB034

The Electromagnetic Field Structure in the Circular Waveguide with Transverse Boundary

434

A.A. Grigoreva
Saint-Petersburg State University, Saint-Petersburg, Russia
S.N. Galyamin, A.V. Tyukhtin, V.V. Vorobev
Saint Petersburg State University, Saint Petersburg, Russia

Funding: This work was supported by Russian Foundation for Basic Research under Grant 15-02-03913.
The study of the electromagnetic field in a circular waveguide having a partial dielectric filling is of interest for a series of applications including new methods of particle acceleration. We consider the structure of the electromagnetic field in the circular waveguide which consists of two semi-infinite parts. One of them is empty and the other one has a cylindrical dielectric layer and a coaxial vacuum channel. Incident electromagnetic field is a symmetrical TM mode launching either from the vacuum part or from the partially dielectric part. Such mode can be excited by a particle bunch moving along the waveguide axis. The analytical investigation of reflected and transmitted fields is performed. On the basis of this study, we develop an algorithm for numerical calculation and demonstrate properties of waveguide modes excited because of presence of transversal boundary. Moreover we perform direct numerical simulation using Comsol Multiphysics. The comparison of results of our algorithm with simulations is given, and the good agreement between both methods is demonstrated.

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPSB068

Radiation From Open-Ended Flanged Waveguide With Dielectric Loading

515

V.V. Vorobev, S.N. Galyamin, A.A. Grigoreva, A.V. Tyukhtin
Saint Petersburg State University, Saint Petersburg, Russia

Funding: The work is supported by the Grant of the President of Russian Federation (No. 6765.2015.2) and the Grants from Russian Foundation for Basic Research (No. 15-32-20985, 15-02-03913).
Terahertz radiation is considered as a promising tool for a number of applications. One possible way to emit THz waves is to pass short electron bunch through a waveguide structure loaded with dielectric. Previously we considered the extraction of radiation from the open end of the waveguide with dielectric loading in both approximate and rigorous formulation. We also developed a rigorous approach based on mode-matching technique and modified residue-calculus technique for the case when the waveguide with dielectric is co-axial with infinite waveguide with greater radius. The study presented is devoted to the case when the dielectric loaded waveguide has a flange and enclosed into another waveguide with a greater radius. The case of the flanged waveguide in the unbounded vacuum space can be described as the limiting case of the problem under consideration. We perform analytical calculation (based on mode-matching technique and modified residue-calculus technique) and direct numerical simulation.

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WEPSB069

Radiation of a Bunch Flying from the Open End of a Waveguide with a Dielectric Loading

518

S.N. Galyamin, A.V. Tyukhtin, V.V. Vorobev
Saint Petersburg State University, Saint Petersburg, Russia
A. Altmark, S. Baturin
LETI, Saint-Petersburg, Russia

Funding: Work is supported by the Grant of the President of Russian Federation (No. 6765.2015.2) and the Grant from Russian Foundation for Basic Research (No. 15-32-20985).
In this paper we proceed with our investigation of Terahertz emission from beam moving in waveguide structures with dielectric layer*. Recently we have considered an open-ended waveguide (with uniform dielectric filling) placed inside regular vacuum waveguide of a larger radius and excited by a single incident waveguide mode**. Here we present analytical results for the case where the structure is excited by a moving charge. We also perform simulations using CST® PS code and compare results.
* S.N. Galyamin, A.V. Tyukhtin, S.S. Baturin, S. Antipov, Opt. Express 22(8) 8902 (2014).
** S.N. Galyamin, A.V. Tyukhtin, S.S. Baturin, V.V. Vorobev, A.A. Grigoreva, in Proc. IPAC'16, pp. 1617-1619.

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