RuPAC2016 - List of Keywords (electromagnetic-fields)

Paper	Title	Other Keywords	Page
TUPSA014	A Simple Model for Electromagnetic Field in RFQ Channel	rfq, focusing, real-time, software	244
	O.I. Drivotin, I.T. Dulatov St. Petersburg State University, St. Petersburg, Russia
	Numerical solution of the RFQ structure optimization problem requires a great amount of computation. Each consecutive step of the numerical optimization includes modification of geometry of the channel and computation of electromagnetic field for modified geometry. Therefore, a simple model describing the field in the channel is needed for the optimization. Such model is proposed in this report. It differs from the commonly used traditional model of the field, which can be applied when profiles of the vanes are described by the harmonic functions of the longitudinal coordinate. Our model is more general and can be applied for arbitrary profiles of the vanes.
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TUPSA052	First Order Perturbation Theory Evaluation of Initial Stage of Self Amplified Crystal-Based X-Ray Emission	electron, radiation, resonance, undulator	325
	A.I. Benediktovitch BSU, Minsk, Belarus, Belarus
	X-ray Free Electron Lasers open new revolutionary opportunities for investigations in materials science, chemistry, biology and other areas. However, due to high cost of construction and maintain, the access to these facilities for wide scientific community is quite limited. This motivates search for schemes of compact bright x-ray sources. The size of X-ray Free Electron Lasers is dictated by basic properties of undulator radiation: to produce x-rays with Angstrom wavelength from cm period undulator one needs electrons with energy in GeV range. If one considers the radiation mechanisms accompanying the propagation of electron beam through a crystal structure (channeling radiation, parametric x-ray radiation, Cherenkov radiation near K-edge), one can see that to get photons in x-ray range one needs electrons with energy of tens to hundreds MeV. One of the ways to get bright x-ray source based on crystal-assisted radiation mechanisms is to run the electrons in coherent radiation regime based on self amplified spontaneous emission (SASE). In the present contribution we will discuss under which conditions the SASE can start in the case of crystal-assisted radiation mechanisms. To investigate the initial stage of SASE process we use the first-order perturbation theory that enables to describe the collective beam response as effective susceptibility. Based on this approach we will analyze which experimental geometry would promising for the SASE process onset.
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WEPSB015	On the Integro-Differential Equations for Dynamics of Interacting Charged Particles Modeling	simulation, plasma, controls, focusing	392
	D.A. Ovsyannikov St. Petersburg State University, St. Petersburg, Russia N.S. Edamenko Saint Petersburg State University, Saint Petersburg, Russia
	In this paper we investigate the integro-differential model for the dynamics of charged particles with smooth interaction for the analysis and optimization of intense charged particle beams motion in accelerating and focusing structures. Introduced mathematical models allows us to calculate the first variation of the different functionals characterizing the desired parameters of accelerators in analytical form. Thus mathematical model can be effectively used in the analysis and optimization of charged particles dynamics in accelerators.
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WEPSB034	The Electromagnetic Field Structure in the Circular Waveguide with Transverse Boundary	vacuum, simulation, acceleration, radiation	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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WEPSB069	Radiation of a Bunch Flying from the Open End of a Waveguide with a Dielectric Loading	radiation, simulation, vacuum, electron	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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THPSC020	Electromagnetic Compatibility of the Power Supply System for Corrector Magnets of the European XFEL	power-supply, operation, coupling, monitoring	581
	O.V. Belikov, V.R. Kozak BINP SB RAS, Novosibirsk, Russia H.-J. Eckoldt, N. Heidbrook, B. Moelck DESY, Hamburg, Germany
	The power supply system for corrector magnets of European X-ray Free-Electron Laser (XFEL) includes more than 300 pieces the precise current sources. To avoid the influence each power supplies to others power supplies the developers should consider and provide the electromagnetic compatibility of power supply system components on the designing phase. For this purpose there should be limited electromagnetic emission from power supplies. There is necessity to provide the tolerance of power supplies against electromagnetic emission, electrostatic discharges and other interference from outside. The paper presents the structural solutions which allowed to provide electromagnetic compatibility and results of testing the developed power supplies.
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Paper

Title

Other Keywords

Page

TUPSA014

A Simple Model for Electromagnetic Field in RFQ Channel

rfq, focusing, real-time, software

244

O.I. Drivotin, I.T. Dulatov
St. Petersburg State University, St. Petersburg, Russia

Numerical solution of the RFQ structure optimization problem requires a great amount of computation. Each consecutive step of the numerical optimization includes modification of geometry of the channel and computation of electromagnetic field for modified geometry. Therefore, a simple model describing the field in the channel is needed for the optimization. Such model is proposed in this report. It differs from the commonly used traditional model of the field, which can be applied when profiles of the vanes are described by the harmonic functions of the longitudinal coordinate. Our model is more general and can be applied for arbitrary profiles of the vanes.

Export •

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

TUPSA052

First Order Perturbation Theory Evaluation of Initial Stage of Self Amplified Crystal-Based X-Ray Emission

electron, radiation, resonance, undulator

325

A.I. Benediktovitch
BSU, Minsk, Belarus, Belarus

X-ray Free Electron Lasers open new revolutionary opportunities for investigations in materials science, chemistry, biology and other areas. However, due to high cost of construction and maintain, the access to these facilities for wide scientific community is quite limited. This motivates search for schemes of compact bright x-ray sources. The size of X-ray Free Electron Lasers is dictated by basic properties of undulator radiation: to produce x-rays with Angstrom wavelength from cm period undulator one needs electrons with energy in GeV range. If one considers the radiation mechanisms accompanying the propagation of electron beam through a crystal structure (channeling radiation, parametric x-ray radiation, Cherenkov radiation near K-edge), one can see that to get photons in x-ray range one needs electrons with energy of tens to hundreds MeV. One of the ways to get bright x-ray source based on crystal-assisted radiation mechanisms is to run the electrons in coherent radiation regime based on self amplified spontaneous emission (SASE). In the present contribution we will discuss under which conditions the SASE can start in the case of crystal-assisted radiation mechanisms. To investigate the initial stage of SASE process we use the first-order perturbation theory that enables to describe the collective beam response as effective susceptibility. Based on this approach we will analyze which experimental geometry would promising for the SASE process onset.

Export •

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

WEPSB015

On the Integro-Differential Equations for Dynamics of Interacting Charged Particles Modeling

simulation, plasma, controls, focusing

392

D.A. Ovsyannikov
St. Petersburg State University, St. Petersburg, Russia
N.S. Edamenko
Saint Petersburg State University, Saint Petersburg, Russia

In this paper we investigate the integro-differential model for the dynamics of charged particles with smooth interaction for the analysis and optimization of intense charged particle beams motion in accelerating and focusing structures. Introduced mathematical models allows us to calculate the first variation of the different functionals characterizing the desired parameters of accelerators in analytical form. Thus mathematical model can be effectively used in the analysis and optimization of charged particles dynamics in accelerators.

Export •

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

WEPSB034

The Electromagnetic Field Structure in the Circular Waveguide with Transverse Boundary

vacuum, simulation, acceleration, radiation

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)

WEPSB069

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

radiation, simulation, vacuum, electron

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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THPSC020

Electromagnetic Compatibility of the Power Supply System for Corrector Magnets of the European XFEL

power-supply, operation, coupling, monitoring

581

O.V. Belikov, V.R. Kozak
BINP SB RAS, Novosibirsk, Russia
H.-J. Eckoldt, N. Heidbrook, B. Moelck
DESY, Hamburg, Germany

The power supply system for corrector magnets of European X-ray Free-Electron Laser (XFEL) includes more than 300 pieces the precise current sources. To avoid the influence each power supplies to others power supplies the developers should consider and provide the electromagnetic compatibility of power supply system components on the designing phase. For this purpose there should be limited electromagnetic emission from power supplies. There is necessity to provide the tolerance of power supplies against electromagnetic emission, electrostatic discharges and other interference from outside. The paper presents the structural solutions which allowed to provide electromagnetic compatibility and results of testing the developed power supplies.

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