RuPAC2021 - List of Authors (Feschenko, A.)

Paper	Title	Page
MOX02	Development and Implementation of Bunch Shape Instrumentation for Ion Linacs	1
	A. Feschenko, V. Gaidash, S.A. Gavrilov RAS/INR, Moscow, Russia
	A longitudinal charge distribution in beam bunches, so-called bunch shape, is one of the most important and difficult to measure characteristics of a beam in ion linear accelerators. Despite the variety of approaches only the methods using low energy secondary electrons emitted, when the beam passes through a thin target, found practical application. The most common beam instrumentation, based on this method, became Bunch Shape Monitor developed in INR RAS. The monitor provides direct measurements of bunch shape and bunch longitudinal halo, allows to carry out such complex diagnostic procedures as longitudinal emittance measurements, amplitude and phase setting of accelerating cavities and control of bunch shape evolution in time to check the overall quality of longitudinal tuning of the accelerator. The principle of the monitor operation, design features, ultimate parameters and limitations are discussed. Several modifications of the monitor with implementation peculiarities are described as well as lots of measurement results at different ion linacs with a variety of beam parameters. New challenges for bunch shape instrumentation to satisfy demands of forthcoming linacs are also characterized.
	Slides MOX02 [9.840 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOX02
About •	Received ※ 30 September 2021 — Revised ※ 04 October 2021 — Accepted ※ 07 October 2021 — Issued ※ 20 October 2021
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPSA06	Parameters of the Normal Conducting Accelerating Structure for the Up to 1 GeV Hadron Linacs	142
	I.V. Rybakov, A. Feschenko, L.V. Kravchuk, V.V. Paramonov, V.L. Serov RAS/INR, Moscow, Russia
	Compensated bi-periodic accelerating structure Cut Disk Structure (CDS) was developed for accelerating particle beams at beta eq 1. In the papers dedicated to the development of this structure, a significant decrease in Ze was shown for medium energies range, beta 0.4-0.5. For high-intensity hadron linacs, this energy range, in which particles are captured to acceleration from the drift tube structure, is of the greatest interest. In this paper, a set of CDS parameters was obtained, which provides a Ze value not lower in the comparison to the proven structures in the medium energy range. By the comparison of the electrodynamic and technological parameters of CDS with these structures, the advantages of its application in multi-section cavities for the up to 1 GeV linacs are shown. The selection of optimal cells manufacturing tolerances, the method of its tuning before brazing and frequency parameters control, and the selection of the method for multipactor discharge suppression are determined. The results of the sketch project of the CDS cavity numerical simulation as a non-uniform coupled system and optimization of the transition part of sections and bridge devices are presented.
DOI •	reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA06
About •	Received ※ 22 September 2021 — Revised ※ 28 September 2021 — Accepted ※ 07 October 2021 — Issued ※ 16 October 2021
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Development and Implementation of Bunch Shape Instrumentation for Ion Linacs

1

A. Feschenko, V. Gaidash, S.A. Gavrilov
RAS/INR, Moscow, Russia

A longitudinal charge distribution in beam bunches, so-called bunch shape, is one of the most important and difficult to measure characteristics of a beam in ion linear accelerators. Despite the variety of approaches only the methods using low energy secondary electrons emitted, when the beam passes through a thin target, found practical application. The most common beam instrumentation, based on this method, became Bunch Shape Monitor developed in INR RAS. The monitor provides direct measurements of bunch shape and bunch longitudinal halo, allows to carry out such complex diagnostic procedures as longitudinal emittance measurements, amplitude and phase setting of accelerating cavities and control of bunch shape evolution in time to check the overall quality of longitudinal tuning of the accelerator. The principle of the monitor operation, design features, ultimate parameters and limitations are discussed. Several modifications of the monitor with implementation peculiarities are described as well as lots of measurement results at different ion linacs with a variety of beam parameters. New challenges for bunch shape instrumentation to satisfy demands of forthcoming linacs are also characterized.

Slides MOX02 [9.840 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOX02

About •

Received ※ 30 September 2021 — Revised ※ 04 October 2021 — Accepted ※ 07 October 2021 — Issued ※ 20 October 2021

Cite •

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

MOPSA06

Parameters of the Normal Conducting Accelerating Structure for the Up to 1 GeV Hadron Linacs

142

I.V. Rybakov, A. Feschenko, L.V. Kravchuk, V.V. Paramonov, V.L. Serov
RAS/INR, Moscow, Russia

Compensated bi-periodic accelerating structure Cut Disk Structure (CDS) was developed for accelerating particle beams at beta eq 1. In the papers dedicated to the development of this structure, a significant decrease in Ze was shown for medium energies range, beta 0.4-0.5. For high-intensity hadron linacs, this energy range, in which particles are captured to acceleration from the drift tube structure, is of the greatest interest. In this paper, a set of CDS parameters was obtained, which provides a Ze value not lower in the comparison to the proven structures in the medium energy range. By the comparison of the electrodynamic and technological parameters of CDS with these structures, the advantages of its application in multi-section cavities for the up to 1 GeV linacs are shown. The selection of optimal cells manufacturing tolerances, the method of its tuning before brazing and frequency parameters control, and the selection of the method for multipactor discharge suppression are determined. The results of the sketch project of the CDS cavity numerical simulation as a non-uniform coupled system and optimization of the transition part of sections and bridge devices are presented.

DOI •

reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-MOPSA06

About •

Received ※ 22 September 2021 — Revised ※ 28 September 2021 — Accepted ※ 07 October 2021 — Issued ※ 16 October 2021

Cite •

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