eeFACT2018 - List of Authors (Belli, E.)

Paper	Title	Page
WEXBA02	Machine Detector Interface for the e⁺e⁻ Future Circular Collider	201
	M. Boscolo, O.R. Blanco-García INFN/LNF, Frascati (Roma), Italy N. Bacchetta INFN- Sez. di Padova, Padova, Italy E. Belli INFN-Roma, Roma, Italy M. Benedikt, H. Burkhardt, D. El Khechen, K. Elsener, M. Gil Costa, P. Janot, R. Kersevan, A.M. Kolano, E. Leogrande, M. Lueckof, E. Perez, N.A. Tehrani, H.H.J. Ten Kate, O. Viazlo, G.G. Voutsinas, F. Zimmermann CERN, Meyrin, Switzerland A.P. Blondel, M. Koratzinos DPNC, Genève, Switzerland A.V. Bogomyagkov, E.B. Levichev, S.V. Sinyatkin BINP SB RAS, Novosibirsk, Russia F. Collamati INFN-Roma1, Rome, Italy M. Dam NBI, København, Denmark A. Novokhatski, M.K. Sullivan SLAC, Menlo Park, California, USA K. Oide KEK, Ibaraki, Japan
	The international Future Circular Collider (FCC) study~[fccweb] aims at a design of p-p, \rm e⁺e^-, e-p colliders to be built in a new 100~km tunnel in the Geneva region. The \rm e⁺e^- collider (FCC-ee) has a centre of mass energy range between 90 (Z-pole) and 375~GeV (t\bar{t}). To reach such unprecedented energies and luminosities, the design of the interaction region is crucial. The crab-waist collision scheme~[ref:cw] has been chosen for the design and it will be compatible with all beam energies. In this paper we will describe the machine detector interface layout including the solenoid compensation scheme. We will describe how this layout fulfills all the requirements set by the parameters table and by the physical constraints. We will summarize the studies of the impact of the synchrotron radiation, the analysis of trapped modes and of the backgrounds induced by single beam and luminosity effects giving an estimate of the losses in the interaction region and in the detector.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEXBA02
About •	paper received ※ 03 November 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019
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WEOAB04	Single Bunch Instabilities and NEG Coating for FCC-ee	234
	E. Belli Sapienza University of Rome, Rome, Italy P. Costa Pinto, G. Rumolo, A. Sapountzis, T.F. Sinkovits, M. Taborelli CERN, Geneva, Switzerland M. Migliorati INFN-Roma1, Rome, Italy M. Zobov INFN/LNF, Frascati, Italy
	The high luminosity electron-positron collider FCC-ee is part of the Future Circular Collider (FCC) study at CERN and it has been designed to cover the beam energy range from 45.6 GeV to 182.5 GeV to study the properties of the Higgs boson and other particles. Electron cloud build up simulations on the Z resonance revealed the necessity of minimising the Secondary Electron Yield (SEY) of the pipe walls by applying a Ti-Zr-V Non-Evaporable Getter (NEG) coating in the entire ring. Beam dynamics simulations at 45.6 GeV pointed out that minimising the thickness of this layer is mandatory to reduce the resistive wall (RW) impedance, thus increasing the single bunch instability thresholds and ensuring beam stability during operation. However, reducing the coating thickness can affect the performance of the material and therefore the SEY. For this reason, an extensive measurement campaign was performed at CERN to characterise NEG thin films with thicknesses below 250 nm in terms of activation performance and SEY measurements. This paper also presents the FCC-ee longitudinal impedance model which includes all the current machine components.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEOAB04
About •	paper received ※ 12 November 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Machine Detector Interface for the e⁺e⁻ Future Circular Collider

201

M. Boscolo, O.R. Blanco-García
INFN/LNF, Frascati (Roma), Italy
N. Bacchetta
INFN- Sez. di Padova, Padova, Italy
E. Belli
INFN-Roma, Roma, Italy
M. Benedikt, H. Burkhardt, D. El Khechen, K. Elsener, M. Gil Costa, P. Janot, R. Kersevan, A.M. Kolano, E. Leogrande, M. Lueckof, E. Perez, N.A. Tehrani, H.H.J. Ten Kate, O. Viazlo, G.G. Voutsinas, F. Zimmermann
CERN, Meyrin, Switzerland
A.P. Blondel, M. Koratzinos
DPNC, Genève, Switzerland
A.V. Bogomyagkov, E.B. Levichev, S.V. Sinyatkin
BINP SB RAS, Novosibirsk, Russia
F. Collamati
INFN-Roma1, Rome, Italy
M. Dam
NBI, København, Denmark
A. Novokhatski, M.K. Sullivan
SLAC, Menlo Park, California, USA
K. Oide
KEK, Ibaraki, Japan

The international Future Circular Collider (FCC) study~[fccweb] aims at a design of p-p, \rm e⁺e^-, e-p colliders to be built in a new 100~km tunnel in the Geneva region. The \rm e⁺e^- collider (FCC-ee) has a centre of mass energy range between 90 (Z-pole) and 375~GeV (t\bar{t}). To reach such unprecedented energies and luminosities, the design of the interaction region is crucial. The crab-waist collision scheme~[ref:cw] has been chosen for the design and it will be compatible with all beam energies. In this paper we will describe the machine detector interface layout including the solenoid compensation scheme. We will describe how this layout fulfills all the requirements set by the parameters table and by the physical constraints. We will summarize the studies of the impact of the synchrotron radiation, the analysis of trapped modes and of the backgrounds induced by single beam and luminosity effects giving an estimate of the losses in the interaction region and in the detector.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEXBA02

About •

paper received ※ 03 November 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019

Export •

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

WEOAB04

Single Bunch Instabilities and NEG Coating for FCC-ee

234

E. Belli
Sapienza University of Rome, Rome, Italy
P. Costa Pinto, G. Rumolo, A. Sapountzis, T.F. Sinkovits, M. Taborelli
CERN, Geneva, Switzerland
M. Migliorati
INFN-Roma1, Rome, Italy
M. Zobov
INFN/LNF, Frascati, Italy

The high luminosity electron-positron collider FCC-ee is part of the Future Circular Collider (FCC) study at CERN and it has been designed to cover the beam energy range from 45.6 GeV to 182.5 GeV to study the properties of the Higgs boson and other particles. Electron cloud build up simulations on the Z resonance revealed the necessity of minimising the Secondary Electron Yield (SEY) of the pipe walls by applying a Ti-Zr-V Non-Evaporable Getter (NEG) coating in the entire ring. Beam dynamics simulations at 45.6 GeV pointed out that minimising the thickness of this layer is mandatory to reduce the resistive wall (RW) impedance, thus increasing the single bunch instability thresholds and ensuring beam stability during operation. However, reducing the coating thickness can affect the performance of the material and therefore the SEY. For this reason, an extensive measurement campaign was performed at CERN to characterise NEG thin films with thicknesses below 250 nm in terms of activation performance and SEY measurements. This paper also presents the FCC-ee longitudinal impedance model which includes all the current machine components.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEOAB04

About •

paper received ※ 12 November 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019

Export •

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