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Single Bunch Instabilities and NEG Coating for FCC-ee

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...

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Autores principales: Belli, Eleonora, Costa Pinto, Pedro, Migliorati, Mauro, Rumolo, Giovanni, Sapountzis, Antonios, Sinkovits, Theo, Taborelli, Mauro, Zobov, Mikhail
Lenguaje:eng
Publicado: JACOW 2019
Materias:
Acceso en línea:https://dx.doi.org/10.18429/JACoW-eeFACT2018-WEOAB04
http://cds.cern.ch/record/2713266
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author Belli, Eleonora
Costa Pinto, Pedro
Migliorati, Mauro
Rumolo, Giovanni
Sapountzis, Antonios
Sinkovits, Theo
Taborelli, Mauro
Zobov, Mikhail
author_facet Belli, Eleonora
Costa Pinto, Pedro
Migliorati, Mauro
Rumolo, Giovanni
Sapountzis, Antonios
Sinkovits, Theo
Taborelli, Mauro
Zobov, Mikhail
author_sort Belli, Eleonora
collection CERN
description 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.
id oai-inspirehep.net-1736353
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2019
publisher JACOW
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spelling oai-inspirehep.net-17363532022-08-10T12:26:28Zdoi:10.18429/JACoW-eeFACT2018-WEOAB04http://cds.cern.ch/record/2713266engBelli, EleonoraCosta Pinto, PedroMigliorati, MauroRumolo, GiovanniSapountzis, AntoniosSinkovits, TheoTaborelli, MauroZobov, MikhailSingle Bunch Instabilities and NEG Coating for FCC-eeAccelerators and Storage RingsThe 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.JACOWoai:inspirehep.net:17363532019
spellingShingle Accelerators and Storage Rings
Belli, Eleonora
Costa Pinto, Pedro
Migliorati, Mauro
Rumolo, Giovanni
Sapountzis, Antonios
Sinkovits, Theo
Taborelli, Mauro
Zobov, Mikhail
Single Bunch Instabilities and NEG Coating for FCC-ee
title Single Bunch Instabilities and NEG Coating for FCC-ee
title_full Single Bunch Instabilities and NEG Coating for FCC-ee
title_fullStr Single Bunch Instabilities and NEG Coating for FCC-ee
title_full_unstemmed Single Bunch Instabilities and NEG Coating for FCC-ee
title_short Single Bunch Instabilities and NEG Coating for FCC-ee
title_sort single bunch instabilities and neg coating for fcc-ee
topic Accelerators and Storage Rings
url https://dx.doi.org/10.18429/JACoW-eeFACT2018-WEOAB04
http://cds.cern.ch/record/2713266
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