Photostimulated desorption performance of the future circular hadron collider beam screen

Synchrotron radiation (SR) originated at superconducting bending magnets is known to be at the origin of several beam detrimental effects related to vacuum instabilities. One of the major challenges in the design of the vacuum beam pipes of high-energy hadron colliders is the SR coping strategy. In...

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Autores principales:	L. A. González, V. Baglin, P. Chiggiato, C. Garion, R. Kersevan, S. Casalbuoni, A. Grau, D. Saez de Jauregui, I. Bellafont, F. Pérez
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
Acceso en línea:	https://doaj.org/article/c76897feaf5145d39cc360fde9fd8e79
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spelling	oai:doaj.org-article:c76897feaf5145d39cc360fde9fd8e792021-11-10T15:05:08ZPhotostimulated desorption performance of the future circular hadron collider beam screen10.1103/PhysRevAccelBeams.24.1132012469-9888https://doaj.org/article/c76897feaf5145d39cc360fde9fd8e792021-11-01T00:00:00Zhttp://doi.org/10.1103/PhysRevAccelBeams.24.113201http://doi.org/10.1103/PhysRevAccelBeams.24.113201https://doaj.org/toc/2469-9888Synchrotron radiation (SR) originated at superconducting bending magnets is known to be at the origin of several beam detrimental effects related to vacuum instabilities. One of the major challenges in the design of the vacuum beam pipes of high-energy hadron colliders is the SR coping strategy. In the case of the future circular hadron collider (FCC-hh), a Cu-coated beam screen (BS) operating in the range of 40–60 K has been designed with the aim of protecting the superconducting magnet cold bores from direct synchrotron irradiation. In order to experimentally study the FCC-hh BS vacuum and cryogenic performance, two sample prototypes were manufactured and installed in the beam screen test-bench experiment (BESTEX) at the Karlsruhe Research Accelerator (KARA) at the Karlsruhe Institute of Technology (KIT). The emitted SR has a critical energy of 6.2 keV, very similar to the 4.6 keV of FCC-hh. Irradiation at both room (RT) and cryogenic (77 K) temperatures showed a significant reduction of the molecular photostimulated desorption yields (η) of the FCC-hh beam screen compared to those of Cu samples. A first approximation of η and its evolution with the photon dose accumulated on the FCC-hh BS prototype at 77 K allows to estimate that a machine conditioning period of ∼1.2 months would be needed to reduce the photostimulated molecular density at the necessary levels to ensure a 100 h beam lifetime at nominal FCC-hh operation.L. A. GonzálezV. BaglinP. ChiggiatoC. GarionR. KersevanS. CasalbuoniA. GrauD. Saez de JaureguiI. BellafontF. PérezAmerican Physical SocietyarticleNuclear and particle physics. Atomic energy. RadioactivityQC770-798ENPhysical Review Accelerators and Beams, Vol 24, Iss 11, p 113201 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
spellingShingle	Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 L. A. González V. Baglin P. Chiggiato C. Garion R. Kersevan S. Casalbuoni A. Grau D. Saez de Jauregui I. Bellafont F. Pérez Photostimulated desorption performance of the future circular hadron collider beam screen
description	Synchrotron radiation (SR) originated at superconducting bending magnets is known to be at the origin of several beam detrimental effects related to vacuum instabilities. One of the major challenges in the design of the vacuum beam pipes of high-energy hadron colliders is the SR coping strategy. In the case of the future circular hadron collider (FCC-hh), a Cu-coated beam screen (BS) operating in the range of 40–60 K has been designed with the aim of protecting the superconducting magnet cold bores from direct synchrotron irradiation. In order to experimentally study the FCC-hh BS vacuum and cryogenic performance, two sample prototypes were manufactured and installed in the beam screen test-bench experiment (BESTEX) at the Karlsruhe Research Accelerator (KARA) at the Karlsruhe Institute of Technology (KIT). The emitted SR has a critical energy of 6.2 keV, very similar to the 4.6 keV of FCC-hh. Irradiation at both room (RT) and cryogenic (77 K) temperatures showed a significant reduction of the molecular photostimulated desorption yields (η) of the FCC-hh beam screen compared to those of Cu samples. A first approximation of η and its evolution with the photon dose accumulated on the FCC-hh BS prototype at 77 K allows to estimate that a machine conditioning period of ∼1.2 months would be needed to reduce the photostimulated molecular density at the necessary levels to ensure a 100 h beam lifetime at nominal FCC-hh operation.
format	article
author	L. A. González V. Baglin P. Chiggiato C. Garion R. Kersevan S. Casalbuoni A. Grau D. Saez de Jauregui I. Bellafont F. Pérez
author_facet	L. A. González V. Baglin P. Chiggiato C. Garion R. Kersevan S. Casalbuoni A. Grau D. Saez de Jauregui I. Bellafont F. Pérez
author_sort	L. A. González
title	Photostimulated desorption performance of the future circular hadron collider beam screen
title_short	Photostimulated desorption performance of the future circular hadron collider beam screen
title_full	Photostimulated desorption performance of the future circular hadron collider beam screen
title_fullStr	Photostimulated desorption performance of the future circular hadron collider beam screen
title_full_unstemmed	Photostimulated desorption performance of the future circular hadron collider beam screen
title_sort	photostimulated desorption performance of the future circular hadron collider beam screen
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/c76897feaf5145d39cc360fde9fd8e79
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Photostimulated desorption performance of the future circular hadron collider beam screen

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