IPAC2016 - List of Authors (Shashkov, Ya.V.)

Paper	Title	Page
WEPMB045	Measurement of Higher Order Modes Electrodynamic Characteristics for Array of Two 2400 MHz Cavities	2214
	Ya.V. Shashkov, R.V. Donetskiy, M.V. Lalayan, N.P. Sobenin MEPhI, Moscow, Russia A. Orlov NRNU, Moscow, Russia
	Funding: Work supported by Ministry of Education and Science grant 3.245.2014/r and the EU FP7 HiLumi LHC ' Grant Agreement 284404 In the frameworks of the High Luminosity Large hadron collider (HL-LHC) upgrade program an application of additional superconducting harmonic cavities operating at 800 MHz is currently under discussion. As a candidate, the two cavities with grooved beam pipes connected by the drift tube were suggested. In this article of measurements of Qload are performed for the aluminum model of array of two cavities connected by drift tube. Field distribution of Fundamental Mode (FM) and Higher Order Modes (HOM) were measured for aluminum prototype with a frequency of the operational mode of 2400 MHz, and their comparison with the simulation results. Higher order modes*
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB045
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WEPMB047	Higher Order Modes Couplers for 800 MHz Harmonic Cavity	2217
	Ya.V. Shashkov, R.V. Donetskiy, M. Gusarova, N.P. Sobenin MEPhI, Moscow, Russia
	Funding: Work supported by Ministry of Education and Science grant 3.245.2014/r For the higher order modes damping (HOM) in the 800 MHz superconducting single cell cavity the HOM coupler was developed. Several versions of the coupler design were shown. For the chain of two cavities with couplers the calculations of external Q-factor are presented. The calculations of multipactor discharge of cavity were also conducted. Higher order modes, Tesla, couplers*
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB047
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WEPMB048	Macros for Identification of Higher Order Modes Types, Their Transverse Shunt Impedance and Kick Factor	2220
	Ya.V. Shashkov MEPhI, Moscow, Russia A. Orlov NRNU, Moscow, Russia
	Funding: Work supported by Ministry of Education and Science grant 3.245.2014/r During the design studies of accelerating cavities one of the most time-consuming tasks is classification of the higher order modes (HOM) types. To automate the process of identification of HOM types special macros for CST Microwave studio was written. This article describes the programs algorithm of mode recognition and the results of the analysis on the example of single cell and 9 cell cavities. Macros for the calculation of the HOM transverse shunt impedance upon Q-factor values and kick-factor was also written. Higher order modes, electrodynamic characteristics, macros*
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB048
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WEPMB049	Transverse Defocusing Study in LPWA Channel for Linear and Bubble Modes	2224
	S.M. Polozov, V.I. Rashchikov, Ya.V. Shashkov MEPhI, Moscow, Russia
	Laser plasma wakefield acceleration (LPWA) is one of most popular novel trends of acceleration. The LPWA has two serous disadvantages as very high energy spread and low part of electrons capturing into acceleration. The waveguide and klystron type beam pre-modulation schemes was proposed , * to growth capturing and to limit the energy spectrum of 2-3 % for 200-300 MeV beam. One interesting effect was detected due to numerical simulation of beam dynamics in plasma channel. Not captured electrons are escape to the channel border fast and this effect should be explained. It was shown that such effect is caused by effective potential function which forms very high defocusing transverse field after its trailing edge. The results of such explanation verified by numerical simulations are discussed in report for linear and bubble LPWA modes. * S.M. Polozov. NIM A, 729, p.517-521, 2013 ** S.M. Polozov. Problems of Atomic Science and Technology. Series: Nuclear Physics Investigations, 6 (88), p. 29- 34, 2013
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB049
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THPMR030	Results of the Use of Axisymmetric RF Focusing in Proton Linacs at Energies up to 7 MeV	3449
	V.S. Dyubkov, Ya.V. Shashkov MEPhI, Moscow, Russia
	During a few decades axisymmetric RF structures with a focusing by means of nonsynchronous spatial harmonics of electromagnetic field are offered instead of proven RFQ. An effectiveness of these structures in the energy range up to 2 MeV was shown in a number of papers. An effectiveness of these structures in the energy range up to 7 MeV is considered in this paper. Results of an analytical investigation and a numerical simulation of self-consistent proton dynamics are presented and discussed.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR030
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Paper

Title

Page

Measurement of Higher Order Modes Electrodynamic Characteristics for Array of Two 2400 MHz Cavities

2214

Ya.V. Shashkov, R.V. Donetskiy, M.V. Lalayan, N.P. Sobenin
MEPhI, Moscow, Russia
A. Orlov
NRNU, Moscow, Russia

Funding: *Work supported by Ministry of Education and Science grant 3.245.2014/r and the EU FP7 HiLumi LHC ' Grant Agreement 284404
In the frameworks of the High Luminosity Large hadron collider (HL-LHC) upgrade program an application of additional superconducting harmonic cavities operating at 800 MHz is currently under discussion. As a candidate, the two cavities with grooved beam pipes connected by the drift tube were suggested. In this article of measurements of Qload are performed for the aluminum model of array of two cavities connected by drift tube. Field distribution of Fundamental Mode (FM) and Higher Order Modes (HOM) were measured for aluminum prototype with a frequency of the operational mode of 2400 MHz, and their comparison with the simulation results.
Higher order modes

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB045

Export •

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

WEPMB047

Higher Order Modes Couplers for 800 MHz Harmonic Cavity

2217

Ya.V. Shashkov, R.V. Donetskiy, M. Gusarova, N.P. Sobenin
MEPhI, Moscow, Russia

Funding: *Work supported by Ministry of Education and Science grant 3.245.2014/r
For the higher order modes damping (HOM) in the 800 MHz superconducting single cell cavity the HOM coupler was developed. Several versions of the coupler design were shown. For the chain of two cavities with couplers the calculations of external Q-factor are presented. The calculations of multipactor discharge of cavity were also conducted.
Higher order modes, Tesla, couplers

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB047

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

WEPMB048

Macros for Identification of Higher Order Modes Types, Their Transverse Shunt Impedance and Kick Factor

2220

Ya.V. Shashkov
MEPhI, Moscow, Russia
A. Orlov
NRNU, Moscow, Russia

Funding: *Work supported by Ministry of Education and Science grant 3.245.2014/r
During the design studies of accelerating cavities one of the most time-consuming tasks is classification of the higher order modes (HOM) types. To automate the process of identification of HOM types special macros for CST Microwave studio was written. This article describes the programs algorithm of mode recognition and the results of the analysis on the example of single cell and 9 cell cavities. Macros for the calculation of the HOM transverse shunt impedance upon Q-factor values and kick-factor was also written.
Higher order modes, electrodynamic characteristics, macros

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB048

Export •

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

WEPMB049

Transverse Defocusing Study in LPWA Channel for Linear and Bubble Modes

2224

S.M. Polozov, V.I. Rashchikov, Ya.V. Shashkov
MEPhI, Moscow, Russia

Laser plasma wakefield acceleration (LPWA) is one of most popular novel trends of acceleration. The LPWA has two serous disadvantages as very high energy spread and low part of electrons capturing into acceleration. The waveguide and klystron type beam pre-modulation schemes was proposed *, ** to growth capturing and to limit the energy spectrum of 2-3 % for 200-300 MeV beam. One interesting effect was detected due to numerical simulation of beam dynamics in plasma channel. Not captured electrons are escape to the channel border fast and this effect should be explained. It was shown that such effect is caused by effective potential function which forms very high defocusing transverse field after its trailing edge. The results of such explanation verified by numerical simulations are discussed in report for linear and bubble LPWA modes.
* S.M. Polozov. NIM A, 729, p.517-521, 2013
** S.M. Polozov. Problems of Atomic Science and Technology. Series: Nuclear Physics Investigations, 6 (88), p. 29- 34, 2013

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB049

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

THPMR030

Results of the Use of Axisymmetric RF Focusing in Proton Linacs at Energies up to 7 MeV

3449

V.S. Dyubkov, Ya.V. Shashkov
MEPhI, Moscow, Russia

During a few decades axisymmetric RF structures with a focusing by means of nonsynchronous spatial harmonics of electromagnetic field are offered instead of proven RFQ. An effectiveness of these structures in the energy range up to 2 MeV was shown in a number of papers. An effectiveness of these structures in the energy range up to 7 MeV is considered in this paper. Results of an analytical investigation and a numerical simulation of self-consistent proton dynamics are presented and discussed.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR030

Export •

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