IPAC2022 - List of Authors (Nagaoka, R.)

Paper	Title	Page
MOPOTK004	Status of the Soleil Upgrade Lattice Robustness Studies	433
	O.R. Blanco-García INFN/LNF, Frascati, Italy D. Amorim, A. Loulergue, L.S. Nadolski, R. Nagaoka SOLEIL, Gif-sur-Yvette, France M.A. Deniaud JAI, Egham, Surrey, United Kingdom
	The SOLEIL synchrotron has entered its Technical Design Report (TDR) phase for the upgrade of its storage ring to a fourth generation synchrotron light source. Verification of the equipment specifications (alignment, magnets, power supplies, BPMs), and the methodology for optics corrections are critical in order to ensure the feasibility of rapid commissioning restoring full performance for daily operations. The end-to-end simulation, from beam threading in the first turns to beam storage and stacking, should be handled with a comprehensive model close to the actual commissioning procedure, taking into account all practical steps. During 2021 and 2022, the CDR lattice has undergone significant modifications in response to additional constraints. In this paper, we present an update of the robustness studies for the TDR baseline lattice.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-MOPOTK004
About •	Received ※ 07 June 2022 — Revised ※ 14 June 2022 — Accepted ※ 17 June 2022 — Issue date ※ 05 July 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPOMS004	TDR Baseline Lattice for the Upgrade of SOLEIL	1393
	A. Loulergue, D. Amorim, O.R. Blanco-García, P. Brunelle, W. Foosang, A. Gamelin, A. Nadji, L.S. Nadolski, R. Nagaoka, R. Ollier, M.-A. Tordeux SOLEIL, Gif-sur-Yvette, France
	Previous CDR studies for the SOLEIL Upgrade project have converged towards a lattice alternating 7BA and 4BA HOA type cells providing a low natural horizontal emittance value in the 80 pm.rad range at an energy of 2.75 GeV. This lattice adapts to the current tunnel geometry as well as to preserve as much as possible the present beamline positions. The TDR lattice is an evolution of the CDR one including longer short straight sections, better relative magnet positioning, and the replacement quadrupole triplets by quadruplets for improving flexibility of optics matching in straight section. The SOLEIL upgrade TDR lattice is then composed of 20 HOA cells with a two-fold symmetry, and provides 20 straight sections having four different lengths of 3.0, 4.2, 8.0, and 8.2 m. This paper reports the linear and the non-linear beam dynamic optimization based on intense MOGA investigations, mainly to improve the energy acceptance required to keep a large enough Touschek beam lifetime. Some future directions for performance improvement are discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOMS004
About •	Received ※ 08 June 2022 — Revised ※ 10 June 2022 — Accepted ※ 23 June 2022 — Issue date ※ 30 June 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPOMS005	SOLEIL Machine Status and Upgrade	1397
	L.S. Nadolski, G. Abeillé, Y.-M. Abiven, F. Bouvet, P. Brunelle, N. Béchu, M.-E. Couprie, X. Delétoille, S. Duigou, A. Gamelin, C. Herbeaux, N. Hubert, M. Labat, J.-F. Lamarre, V. Le Roux, A. Lestrade, A. Loulergue, O. Marcouillé, F. Marteau, A. Nadji, R. Nagaoka, M. Nouna, Y. Rahier, F. Ribeiro, G. Schaguene, K. Tavakoli, M.-A. Tordeux SOLEIL, Gif-sur-Yvette, France S. Ducourtieux LNE, Trappes Cedex, France
	SOLEIL is both a 2.75 GeV third generation synchrotron light source and a research laboratory at the forefront of experimental techniques dedicated to matter analysis down to the atomic scale, as well as a service platform open to all scientific and industrial communities. We present the performance of the accelerators delivering extremely stable photon beams to 29 beamlines. We report on the commissioning of a superbend magnet replacing a standard 1.71T dipole with a 2.84 T narrow peak permanent magnet-based dipole. It required local modification of the lattice to compensate linear and nonlinear optics distortions introduced by the new magnet field. The latest measurements made with a Multipole Injection Kicker are also reported. Work on the NEG test bench and its dedicated front-end for a 10 mm inner diameter vacuum pipe and other major R&D areas are also addressed in the frame of the SOLEIL upgrade.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOMS005
About •	Received ※ 10 June 2022 — Revised ※ 14 June 2022 — Accepted ※ 15 June 2022 — Issue date ※ 30 June 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPOMS001	Effect of Betatron Coupling on Transverse Mode-Coupling and Head-Tail Instabilities	2225
SUSPMF069	use link to see paper's listing under its alternate paper code
	W. Foosang, A. Gamelin, R. Nagaoka SOLEIL, Gif-sur-Yvette, France
	In the context of SOLEIL Upgrade, the 4th generation storage ring project of SOLEIL, several methods are pursued to extend the beam lifetime and limit the emittance growth by reducing the Touschek effect and intra-beam scattering. Betatron coupling is one of the potential techniques to achieve this objective as it can increase the beam volume by transforming a flat beam into a round beam. However, the effect of the coupling on the collective effects is not fully comprehended, but some studies have shown an improvement in transverse instability thresholds. It was, therefore, crucial to investigate the impact of coupling on beam instability for SOLEIL Upgrade. This work presents numerical studies on the impact of coupling on the transverse mode-coupling and the head-tail instabilities. The results showed that coupling could be not only beneficial, but also detrimental.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-WEPOMS001
About •	Received ※ 08 June 2022 — Accepted ※ 22 June 2022 — Issue date ※ 04 July 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPOMS003	Beam Dynamics with a Superconducting Harmonic Cavity for the SOLEIL Upgrade	2229
	A. Gamelin, W. Foosang, P. Marchand, R. Nagaoka SOLEIL, Gif-sur-Yvette, France N. Yamamoto KEK, Ibaraki, Japan
	In 4th generation low emittance synchrotron light sources, harmonic cavities are critical components needed to reach the required performance. However, RF systems with harmonic cavities can be limited by their own set of instabilities. An instability dominated by the coupled-bunch mode l=1 can prevent the RF system from reaching the flat potential condition, hence limiting the maximum bunch lengthening. Here we report how this instability impacts the performance of 3rd and 4th harmonic superconducting cavities for the SOLEIL Upgrade.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-WEPOMS003
About •	Received ※ 08 June 2022 — Accepted ※ 22 June 2022 — Issue date ※ 26 June 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Status of the Soleil Upgrade Lattice Robustness Studies

433

O.R. Blanco-García
INFN/LNF, Frascati, Italy
D. Amorim, A. Loulergue, L.S. Nadolski, R. Nagaoka
SOLEIL, Gif-sur-Yvette, France
M.A. Deniaud
JAI, Egham, Surrey, United Kingdom

The SOLEIL synchrotron has entered its Technical Design Report (TDR) phase for the upgrade of its storage ring to a fourth generation synchrotron light source. Verification of the equipment specifications (alignment, magnets, power supplies, BPMs), and the methodology for optics corrections are critical in order to ensure the feasibility of rapid commissioning restoring full performance for daily operations. The end-to-end simulation, from beam threading in the first turns to beam storage and stacking, should be handled with a comprehensive model close to the actual commissioning procedure, taking into account all practical steps. During 2021 and 2022, the CDR lattice has undergone significant modifications in response to additional constraints. In this paper, we present an update of the robustness studies for the TDR baseline lattice.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-MOPOTK004

About •

Received ※ 07 June 2022 — Revised ※ 14 June 2022 — Accepted ※ 17 June 2022 — Issue date ※ 05 July 2022

Cite •

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

TUPOMS004

TDR Baseline Lattice for the Upgrade of SOLEIL

1393

A. Loulergue, D. Amorim, O.R. Blanco-García, P. Brunelle, W. Foosang, A. Gamelin, A. Nadji, L.S. Nadolski, R. Nagaoka, R. Ollier, M.-A. Tordeux
SOLEIL, Gif-sur-Yvette, France

Previous CDR studies for the SOLEIL Upgrade project have converged towards a lattice alternating 7BA and 4BA HOA type cells providing a low natural horizontal emittance value in the 80 pm.rad range at an energy of 2.75 GeV. This lattice adapts to the current tunnel geometry as well as to preserve as much as possible the present beamline positions. The TDR lattice is an evolution of the CDR one including longer short straight sections, better relative magnet positioning, and the replacement quadrupole triplets by quadruplets for improving flexibility of optics matching in straight section. The SOLEIL upgrade TDR lattice is then composed of 20 HOA cells with a two-fold symmetry, and provides 20 straight sections having four different lengths of 3.0, 4.2, 8.0, and 8.2 m. This paper reports the linear and the non-linear beam dynamic optimization based on intense MOGA investigations, mainly to improve the energy acceptance required to keep a large enough Touschek beam lifetime. Some future directions for performance improvement are discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOMS004

About •

Received ※ 08 June 2022 — Revised ※ 10 June 2022 — Accepted ※ 23 June 2022 — Issue date ※ 30 June 2022

Cite •

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

TUPOMS005

SOLEIL Machine Status and Upgrade

1397

L.S. Nadolski, G. Abeillé, Y.-M. Abiven, F. Bouvet, P. Brunelle, N. Béchu, M.-E. Couprie, X. Delétoille, S. Duigou, A. Gamelin, C. Herbeaux, N. Hubert, M. Labat, J.-F. Lamarre, V. Le Roux, A. Lestrade, A. Loulergue, O. Marcouillé, F. Marteau, A. Nadji, R. Nagaoka, M. Nouna, Y. Rahier, F. Ribeiro, G. Schaguene, K. Tavakoli, M.-A. Tordeux
SOLEIL, Gif-sur-Yvette, France
S. Ducourtieux
LNE, Trappes Cedex, France

SOLEIL is both a 2.75 GeV third generation synchrotron light source and a research laboratory at the forefront of experimental techniques dedicated to matter analysis down to the atomic scale, as well as a service platform open to all scientific and industrial communities. We present the performance of the accelerators delivering extremely stable photon beams to 29 beamlines. We report on the commissioning of a superbend magnet replacing a standard 1.71T dipole with a 2.84 T narrow peak permanent magnet-based dipole. It required local modification of the lattice to compensate linear and nonlinear optics distortions introduced by the new magnet field. The latest measurements made with a Multipole Injection Kicker are also reported. Work on the NEG test bench and its dedicated front-end for a 10 mm inner diameter vacuum pipe and other major R&D areas are also addressed in the frame of the SOLEIL upgrade.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOMS005

About •

Received ※ 10 June 2022 — Revised ※ 14 June 2022 — Accepted ※ 15 June 2022 — Issue date ※ 30 June 2022

Cite •

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

WEPOMS001

Effect of Betatron Coupling on Transverse Mode-Coupling and Head-Tail Instabilities

2225

SUSPMF069

use link to see paper's listing under its alternate paper code

W. Foosang, A. Gamelin, R. Nagaoka
SOLEIL, Gif-sur-Yvette, France

In the context of SOLEIL Upgrade, the 4th generation storage ring project of SOLEIL, several methods are pursued to extend the beam lifetime and limit the emittance growth by reducing the Touschek effect and intra-beam scattering. Betatron coupling is one of the potential techniques to achieve this objective as it can increase the beam volume by transforming a flat beam into a round beam. However, the effect of the coupling on the collective effects is not fully comprehended, but some studies have shown an improvement in transverse instability thresholds. It was, therefore, crucial to investigate the impact of coupling on beam instability for SOLEIL Upgrade. This work presents numerical studies on the impact of coupling on the transverse mode-coupling and the head-tail instabilities. The results showed that coupling could be not only beneficial, but also detrimental.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-WEPOMS001

About •

Received ※ 08 June 2022 — Accepted ※ 22 June 2022 — Issue date ※ 04 July 2022

Cite •

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

WEPOMS003

Beam Dynamics with a Superconducting Harmonic Cavity for the SOLEIL Upgrade

2229

A. Gamelin, W. Foosang, P. Marchand, R. Nagaoka
SOLEIL, Gif-sur-Yvette, France
N. Yamamoto
KEK, Ibaraki, Japan

In 4th generation low emittance synchrotron light sources, harmonic cavities are critical components needed to reach the required performance. However, RF systems with harmonic cavities can be limited by their own set of instabilities. An instability dominated by the coupled-bunch mode l=1 can prevent the RF system from reaching the flat potential condition, hence limiting the maximum bunch lengthening. Here we report how this instability impacts the performance of 3rd and 4th harmonic superconducting cavities for the SOLEIL Upgrade.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-WEPOMS003

About •

Received ※ 08 June 2022 — Accepted ※ 22 June 2022 — Issue date ※ 26 June 2022

Cite •

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