eeFACT2022 - List of Authors (Zimmermann, F.)

Paper	Title	Page
THYAS0202	Optics Design for a Monochromatization Scheme for the Direct S-Channel Higgs Production at FCC-ee Collider
	H.P. Jiang HIT, Harbin, People’s Republic of China A. Faus-Golfe IFIC, Valencia, Spain A. Faus-Golfe, Z.D. Zhang Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France K. Oide, F. Zimmermann, F. Zimmermann, F. Zimmermann CERN, Meyrin, Switzerland K. Oide KEK, Ibaraki, Japan Z.D. Zhang IHEP, Beijing, People’s Republic of China Z.D. Zhang UCAS, Beijing, People’s Republic of China F. Zimmermann APS, Silver Spring, USA
	The FCC-ee collider baseline foresees four different energy operation modes: Z, WW, H(ZH) and ttbar. An optional fifth mode, called s-channel Higgs production mode, could allow the measurement of the electron Yukawa coupling, in dedicated runs at 125 GeV centre-of-mass energy, provided that the centre-of-mass energy spread, can be reduced by at least an order of magnitude (5-10 MeV). The use of a special collision technique known as monochromatization scheme (mono-scheme) is one way to accomplish it. The transverse monochromatization scheme consists of introducing a dispersion function different from zero but of opposite sign for the two colliding beams at the Interaction Point (IP); In this paper, we will report about the trade-off between energy spread and luminosity, and the first attempt to design a new optics to implement a transverse monochromatic scheme for the FCC-ee Higgs production.
	Slides THYAS0202 [2.133 MB]
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MOXAT0104	FCC-ee Feasibility Study Progress	7
	F. Zimmermann, M. Benedikt CERN, Meyrin, Switzerland
	Funding: Work supported by the European Union’s H2020 Framework Programme under grant agreement no.~951754 (FCCIS). The Future Circular Collider (FCC) ’’integrated programme’’ consists of a proposed high-luminosity e⁺e⁻ collider, FCC-ee, serving as Higgs and electroweak factory, which would, in a second stage, be succeeded by a 100 TeV hadron collider, FCC-hh. FCC-ee and FCC-hh share the same 91 km tunnel and technical infrastructure. In summer 2021 a detailed FCC Feasibility Study (FCC FC), focused on siting, tunnel construction, environmental impact, financing, operational organisation, etc., was launched by the CERN Council. This FCC Feasibility Study (FCC FS) should provide the necessary input to the next European Strategy Update expected in 2026/27. In this paper we briefly review the FCC key design features, status and plans. This paper is an updated, slightly modified version of an article submitted to the proceedings of NA-PAC’22 (published under the Creative Commons Attribution 3.0 license). Sections on two planned accelerator mock-ups and on regional activities were taken from an article in the ECFA Newsletter.
	Slides MOXAT0104 [8.385 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-eeFACT2022-MOXAT0104
About •	Received ※ 16 January 2023 — Revised ※ 06 February 2023 — Accepted ※ 08 February 2023 — Issue date ※ 19 February 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUYAT0101	Beam Physics Frontier Problems	42
	F. Zimmermann CERN, Meyrin, Switzerland
	Funding: This work was supported, in parts, by funding from the European Union’s Horizon 2020 Research and Innovation programme under Grant Agreement No 101004730 (iFAST). The main challenges for far-future higher-energy particle colliders are discussed along with possible technological paths to overcome them. This workshop paper is mostly an abbreviated version of an article published in the ’’Frontiers in Physics’’ journal (under the Creative Commons Attribution 4.0 International licence). The topic of electric power generation using accelerators has been added.
	Slides TUYAT0101 [8.444 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-eeFACT2022-TUYAT0101
About •	Received ※ 16 January 2023 — Revised ※ 07 February 2023 — Accepted ※ 08 February 2023 — Issue date ※ 09 February 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUYAT0102	FCC-ee Lattice Design	52
	J. Keintzel, A. Abramov, M. Benedikt, M. Hofer, K. Oide, R. Tomás García, F. Zimmermann CERN, Meyrin, Switzerland P.J. Hunchak University of Saskatchewan, Saskatoon, Canada T.O. Raubenheimer SLAC, Menlo Park, California, USA
	Funding: The work is also supported by the FCC-IS project, receiving funding from the European Union’s H2020 Framework Programme under grant agreement no. 951754. Within the framework of the Future Circular Collider Feasibility and Design Study, the design of the electron-positron collider FCC-ee is being optimised, as a possible future double collider ring, currently foreseen to start operation during the 2040s. FCC-ee is designed to operate at four different energy stages, allowing for precision measurements: from the Z-pole up to above the ttbar-threshold. This synchrotron with almost 100 km circumference is designed including advanced accelerator concepts, such as the crab-waist collision scheme or one combined off-momentum and betatron collimation insertion. Furthermore, numerous optics tuning and measurement studies are being performed to drive the collider design at an early stage and guarantee its feasibility and efficient operation.
	Slides TUYAT0102 [3.431 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-eeFACT2022-TUYAT0102
About •	Received ※ 29 November 2022 — Revised ※ 06 February 2023 — Accepted ※ 08 February 2023 — Issue date ※ 11 February 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEYAT0103	Studies and Possible Mitigation of Electron Cloud Effects in FCC-ee	154
	F. Yaman IZTECH, Izmir, Turkey F. Zimmermann CERN, Meyrin, Switzerland
	In this work, we present numerical results for the electron cloud build-up and mitigation studies considering Arc Dipole and Drift sections of the FCC-ee collider. We report the central electron density that could be reached by minimising secondary electron contributions and the photoelectron generation rates in order to achieve e^- densities lower than the single-bunch instability threshold, considering the baseline beam parameters. Additionally, simulation results revealing the behavior of electron-cloud formations for various SEY values, photoemission rates, vacuum chamber radii, and bunch spacings are included. In the last section, we discuss initial investigations to clean residual electrons after the beam pass.
	Slides WEYAT0103 [9.454 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-eeFACT2022-WEYAT0103
About •	Received ※ 16 January 2023 — Revised ※ 06 February 2023 — Accepted ※ 07 February 2023 — Issue date ※ 10 February 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRXAS0101	Power Budgets and Performance Considerations for Future Higgs Factories	256
	F. Zimmermann CERN, Meyrin, Switzerland S.A. Belomestnykh, V.D. Shiltsev Fermilab, Batavia, Illinois, USA M.E. Biagini, M. Boscolo LNF-INFN, Frascati, Italy A. Faus-Golfe Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France J. Gao IHEP, Beijing, People’s Republic of China M. Koratzinos PSI, Villigen PSI, Switzerland B. List DESY, Hamburg, Germany V. Litvinenko Stony Brook University, Stony Brook, USA E.A. Nanni, P. Raimondi, T.O. Raubenheimer, J.T. Seeman SLAC, Menlo Park, California, USA K. Oide DPNC, Genève, Switzerland R.A. Rimmer, T. Satogata JLab, Newport News, Virginia, USA
	Funding: Work supported by the European Union’s H2020 Framework Programme under grant agreement no. 951754 (FCCIS), and by Fermi Research Alliance, LLC, under contract No. De-AC02-07CH11359 with the US DoE. A special session at eeFACT’22 reviewed the electrical power budgets and luminosity risks for eight proposed future Higgs and electroweak factories (CCC, CEPC, CERC, CLIC, FCC-ee, HELEN, ILC, and RELIC) and, in comparison, for a lepton-hadron collider (EIC) presently under construction. We report highlights of presentations and discussions.
	Slides FRXAS0101 [1.291 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-eeFACT2022-FRXAS0101
About •	Received ※ 16 January 2023 — Revised ※ 04 February 2023 — Accepted ※ 08 February 2023 — Issue date ※ 10 February 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

THYAS0202

Optics Design for a Monochromatization Scheme for the Direct S-Channel Higgs Production at FCC-ee Collider

H.P. Jiang
HIT, Harbin, People’s Republic of China
A. Faus-Golfe
IFIC, Valencia, Spain
A. Faus-Golfe, Z.D. Zhang
Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
K. Oide, F. Zimmermann, F. Zimmermann, F. Zimmermann
CERN, Meyrin, Switzerland
K. Oide
KEK, Ibaraki, Japan
Z.D. Zhang
IHEP, Beijing, People’s Republic of China
Z.D. Zhang
UCAS, Beijing, People’s Republic of China
F. Zimmermann
APS, Silver Spring, USA

The FCC-ee collider baseline foresees four different energy operation modes: Z, WW, H(ZH) and ttbar. An optional fifth mode, called s-channel Higgs production mode, could allow the measurement of the electron Yukawa coupling, in dedicated runs at 125 GeV centre-of-mass energy, provided that the centre-of-mass energy spread, can be reduced by at least an order of magnitude (5-10 MeV). The use of a special collision technique known as monochromatization scheme (mono-scheme) is one way to accomplish it. The transverse monochromatization scheme consists of introducing a dispersion function different from zero but of opposite sign for the two colliding beams at the Interaction Point (IP); In this paper, we will report about the trade-off between energy spread and luminosity, and the first attempt to design a new optics to implement a transverse monochromatic scheme for the FCC-ee Higgs production.

Slides THYAS0202 [2.133 MB]

Cite •

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

MOXAT0104

FCC-ee Feasibility Study Progress

7

F. Zimmermann, M. Benedikt
CERN, Meyrin, Switzerland

Funding: Work supported by the European Union’s H2020 Framework Programme under grant agreement no.~951754 (FCCIS).
The Future Circular Collider (FCC) ’’integrated programme’’ consists of a proposed high-luminosity e⁺e⁻ collider, FCC-ee, serving as Higgs and electroweak factory, which would, in a second stage, be succeeded by a 100 TeV hadron collider, FCC-hh. FCC-ee and FCC-hh share the same 91 km tunnel and technical infrastructure. In summer 2021 a detailed FCC Feasibility Study (FCC FC), focused on siting, tunnel construction, environmental impact, financing, operational organisation, etc., was launched by the CERN Council. This FCC Feasibility Study (FCC FS) should provide the necessary input to the next European Strategy Update expected in 2026/27. In this paper we briefly review the FCC key design features, status and plans. This paper is an updated, slightly modified version of an article submitted to the proceedings of NA-PAC’22 (published under the Creative Commons Attribution 3.0 license). Sections on two planned accelerator mock-ups and on regional activities were taken from an article in the ECFA Newsletter.

Slides MOXAT0104 [8.385 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-eeFACT2022-MOXAT0104

About •

Received ※ 16 January 2023 — Revised ※ 06 February 2023 — Accepted ※ 08 February 2023 — Issue date ※ 19 February 2023

Cite •

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

TUYAT0101

Beam Physics Frontier Problems

42

F. Zimmermann
CERN, Meyrin, Switzerland

Funding: This work was supported, in parts, by funding from the European Union’s Horizon 2020 Research and Innovation programme under Grant Agreement No 101004730 (iFAST).
The main challenges for far-future higher-energy particle colliders are discussed along with possible technological paths to overcome them. This workshop paper is mostly an abbreviated version of an article published in the ’’Frontiers in Physics’’ journal (under the Creative Commons Attribution 4.0 International licence). The topic of electric power generation using accelerators has been added.

Slides TUYAT0101 [8.444 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-eeFACT2022-TUYAT0101

About •

Received ※ 16 January 2023 — Revised ※ 07 February 2023 — Accepted ※ 08 February 2023 — Issue date ※ 09 February 2023

Cite •

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

TUYAT0102

FCC-ee Lattice Design

52

J. Keintzel, A. Abramov, M. Benedikt, M. Hofer, K. Oide, R. Tomás García, F. Zimmermann
CERN, Meyrin, Switzerland
P.J. Hunchak
University of Saskatchewan, Saskatoon, Canada
T.O. Raubenheimer
SLAC, Menlo Park, California, USA

Funding: The work is also supported by the FCC-IS project, receiving funding from the European Union’s H2020 Framework Programme under grant agreement no. 951754.
Within the framework of the Future Circular Collider Feasibility and Design Study, the design of the electron-positron collider FCC-ee is being optimised, as a possible future double collider ring, currently foreseen to start operation during the 2040s. FCC-ee is designed to operate at four different energy stages, allowing for precision measurements: from the Z-pole up to above the ttbar-threshold. This synchrotron with almost 100 km circumference is designed including advanced accelerator concepts, such as the crab-waist collision scheme or one combined off-momentum and betatron collimation insertion. Furthermore, numerous optics tuning and measurement studies are being performed to drive the collider design at an early stage and guarantee its feasibility and efficient operation.

Slides TUYAT0102 [3.431 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-eeFACT2022-TUYAT0102

About •

Received ※ 29 November 2022 — Revised ※ 06 February 2023 — Accepted ※ 08 February 2023 — Issue date ※ 11 February 2023

Cite •

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

WEYAT0103

Studies and Possible Mitigation of Electron Cloud Effects in FCC-ee

154

F. Yaman
IZTECH, Izmir, Turkey
F. Zimmermann
CERN, Meyrin, Switzerland

In this work, we present numerical results for the electron cloud build-up and mitigation studies considering Arc Dipole and Drift sections of the FCC-ee collider. We report the central electron density that could be reached by minimising secondary electron contributions and the photoelectron generation rates in order to achieve e^- densities lower than the single-bunch instability threshold, considering the baseline beam parameters. Additionally, simulation results revealing the behavior of electron-cloud formations for various SEY values, photoemission rates, vacuum chamber radii, and bunch spacings are included. In the last section, we discuss initial investigations to clean residual electrons after the beam pass.

Slides WEYAT0103 [9.454 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-eeFACT2022-WEYAT0103

About •

Received ※ 16 January 2023 — Revised ※ 06 February 2023 — Accepted ※ 07 February 2023 — Issue date ※ 10 February 2023

Cite •

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

FRXAS0101

Power Budgets and Performance Considerations for Future Higgs Factories

256

F. Zimmermann
CERN, Meyrin, Switzerland
S.A. Belomestnykh, V.D. Shiltsev
Fermilab, Batavia, Illinois, USA
M.E. Biagini, M. Boscolo
LNF-INFN, Frascati, Italy
A. Faus-Golfe
Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
J. Gao
IHEP, Beijing, People’s Republic of China
M. Koratzinos
PSI, Villigen PSI, Switzerland
B. List
DESY, Hamburg, Germany
V. Litvinenko
Stony Brook University, Stony Brook, USA
E.A. Nanni, P. Raimondi, T.O. Raubenheimer, J.T. Seeman
SLAC, Menlo Park, California, USA
K. Oide
DPNC, Genève, Switzerland
R.A. Rimmer, T. Satogata
JLab, Newport News, Virginia, USA

Funding: Work supported by the European Union’s H2020 Framework Programme under grant agreement no. 951754 (FCCIS), and by Fermi Research Alliance, LLC, under contract No. De-AC02-07CH11359 with the US DoE.
A special session at eeFACT’22 reviewed the electrical power budgets and luminosity risks for eight proposed future Higgs and electroweak factories (CCC, CEPC, CERC, CLIC, FCC-ee, HELEN, ILC, and RELIC) and, in comparison, for a lepton-hadron collider (EIC) presently under construction. We report highlights of presentations and discussions.

Slides FRXAS0101 [1.291 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-eeFACT2022-FRXAS0101

About •

Received ※ 16 January 2023 — Revised ※ 04 February 2023 — Accepted ※ 08 February 2023 — Issue date ※ 10 February 2023

Cite •

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