RUPAC2018 - List of Authors (Paramonov, V.V.)

Paper	Title	Page
THCBMH02	Evaluations of Parameters Stability of S-Band RF Gun Cavity Due to Effects of Pulsed RF Heating	100
	V.V. Paramonov, A.K. Skasyrskaya RAS/INR, Moscow, Russia B.L. Militsyn STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
	Requirements to high performances for modern FEL facilities transform to requirements of high stability of the field amplitude and phase in RF gun cavity. To provide high quality of bunches, RF gun cavities with photo cathodes operate in electron sources with high electric, hence, magnetic RF fields. Related to pulsed RF heating effects manifest themselves, which results in a change of the cavity frequency and quality factor even during several microseconds in RF pulse. Cavity deformations due to pulsed heating are considered and corresponding deviations in cavity frequency are evaluated basing both on general relations and results of numerical simulations. Resulting unavoidable deviations in the phase and the amplitude of the RF field in the cavity are estimated in dependence on the RF pulse duration.
	Slides THCBMH02 [1.938 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-RUPAC2018-THCBMH02
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TUPSA25	Construction and RF Test of the Debuncher for NICA Light Ion Beam Line	197
	D.A. Zavadtsev, D. Churanov, Y.Z. Kalinin, L.V. Kravchuk, V.V. Paramonov, A.A. Zavadtsev RAS/INR, Moscow, Russia A.V. Butenko, A.V. Smirnov, E. Syresin JINR, Dubna, Moscow Region, Russia
	Debuncher is to be installed in the present beam line after the LU-20 linac in the light ion injector of the NICA facili-ty. The purpose of the debuncher is to reduce by a factor of up to ten the ion energy spread in the accelerated beam before injection into the Nuclotron. Relative ion speed is 0.1. Split-ring cavity driven from solid state RF amplifier at 145.25 MHz, should provide effective RF voltage up to 200 kV at 4 kW peak RF power. The RF controller allows adjust effective RF voltage for different ions: 58 kV for Z/A=1, 121 kV for Z/A=0.5 and 190 kV for Z/A=0.3. The debuncher cavity is provided with the stepper-motor driven capacitance tuner with 2 MHz tun-ing range.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-RUPAC2018-TUPSA25
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WEPSB10	Study of the Non-Uniform Coupled System Model of CDS Section and Waveguide Segment Based on Multimode Approximation	301
	I.V. Rybakov, V.V. Paramonov RAS/INR, Moscow, Russia
	With the development of the new CDS section-based cavity for the first four-section cavity of the main part of INR RAS linac replacement application of the bridge devices, similar to existing rectangular waveguide segments-based devices is supposed. Numerical simulation of a complete cavity coupled with bridge devices requires unattainable computing resources. In this regard, the analytical representation for the coupled non-uniform system based on multimode approximation is considered. The analytical model for a system consisting of a short CDS section coupled with a rectangular waveguide segment is presented. The model is calibrated by direct numerical simulation. A generalization allowing parameters selection for the new CDS cavity sections and bridge devices coupling based on the presented model is proposed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-RUPAC2018-WEPSB10
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WEPSB53	Start of Operation of a Standing Wave Deflecting Cavity With the Minimized Level of Aberrations	388
	V.V. Paramonov RAS/INR, Moscow, Russia V. Danielyan, A.S. Simonyan, V.M. Tsakanov CANDLE SRI, Yerevan, Armenia K. Flöttmann DESY, Hamburg, Germany
	The family of deflecting structures with the improved RF efficiency and minimized level of aberrations in the field distribution was presented at RUPAC 2016. The first, inside proposed, cavity is applied for diagnostic of longitudinal distribution of electrons in unique bunches of REGAE facility. The short deflecting cavity was constructed, tuned and installed now in REGAE beam line. The cavity is tested at operational level of RF power. The main distinctive features of the cavity are described and obtained results are reported. Effective RF Deflecting Structures for Bunch Rotation and Deflection, Proc. RuPAC 2016, p.201, 2016
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-RUPAC2018-WEPSB53
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Paper

Title

Page

Evaluations of Parameters Stability of S-Band RF Gun Cavity Due to Effects of Pulsed RF Heating

100

V.V. Paramonov, A.K. Skasyrskaya
RAS/INR, Moscow, Russia
B.L. Militsyn
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom

Requirements to high performances for modern FEL facilities transform to requirements of high stability of the field amplitude and phase in RF gun cavity. To provide high quality of bunches, RF gun cavities with photo cathodes operate in electron sources with high electric, hence, magnetic RF fields. Related to pulsed RF heating effects manifest themselves, which results in a change of the cavity frequency and quality factor even during several microseconds in RF pulse. Cavity deformations due to pulsed heating are considered and corresponding deviations in cavity frequency are evaluated basing both on general relations and results of numerical simulations. Resulting unavoidable deviations in the phase and the amplitude of the RF field in the cavity are estimated in dependence on the RF pulse duration.

Slides THCBMH02 [1.938 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-RUPAC2018-THCBMH02

Export •

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

TUPSA25

Construction and RF Test of the Debuncher for NICA Light Ion Beam Line

197

D.A. Zavadtsev, D. Churanov, Y.Z. Kalinin, L.V. Kravchuk, V.V. Paramonov, A.A. Zavadtsev
RAS/INR, Moscow, Russia
A.V. Butenko, A.V. Smirnov, E. Syresin
JINR, Dubna, Moscow Region, Russia

Debuncher is to be installed in the present beam line after the LU-20 linac in the light ion injector of the NICA facili-ty. The purpose of the debuncher is to reduce by a factor of up to ten the ion energy spread in the accelerated beam before injection into the Nuclotron. Relative ion speed is 0.1. Split-ring cavity driven from solid state RF amplifier at 145.25 MHz, should provide effective RF voltage up to 200 kV at 4 kW peak RF power. The RF controller allows adjust effective RF voltage for different ions: 58 kV for Z/A=1, 121 kV for Z/A=0.5 and 190 kV for Z/A=0.3. The debuncher cavity is provided with the stepper-motor driven capacitance tuner with 2 MHz tun-ing range.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-RUPAC2018-TUPSA25

Export •

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

WEPSB10

Study of the Non-Uniform Coupled System Model of CDS Section and Waveguide Segment Based on Multimode Approximation

301

I.V. Rybakov, V.V. Paramonov
RAS/INR, Moscow, Russia

With the development of the new CDS section-based cavity for the first four-section cavity of the main part of INR RAS linac replacement application of the bridge devices, similar to existing rectangular waveguide segments-based devices is supposed. Numerical simulation of a complete cavity coupled with bridge devices requires unattainable computing resources. In this regard, the analytical representation for the coupled non-uniform system based on multimode approximation is considered. The analytical model for a system consisting of a short CDS section coupled with a rectangular waveguide segment is presented. The model is calibrated by direct numerical simulation. A generalization allowing parameters selection for the new CDS cavity sections and bridge devices coupling based on the presented model is proposed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-RUPAC2018-WEPSB10

Export •

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

WEPSB53

Start of Operation of a Standing Wave Deflecting Cavity With the Minimized Level of Aberrations

388

V.V. Paramonov
RAS/INR, Moscow, Russia
V. Danielyan, A.S. Simonyan, V.M. Tsakanov
CANDLE SRI, Yerevan, Armenia
K. Flöttmann
DESY, Hamburg, Germany

The family of deflecting structures with the improved RF efficiency and minimized level of aberrations in the field distribution was presented at RUPAC 2016*. The first, inside proposed, cavity is applied for diagnostic of longitudinal distribution of electrons in unique bunches of REGAE facility. The short deflecting cavity was constructed, tuned and installed now in REGAE beam line. The cavity is tested at operational level of RF power. The main distinctive features of the cavity are described and obtained results are reported.
*Effective RF Deflecting Structures for Bunch Rotation and Deflection, Proc. RuPAC 2016, p.201, 2016

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-RUPAC2018-WEPSB53

Export •

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