Emittance Evolution in the LHC: From Injection to Collisions

The emittance of the LHC beams when arriving in collisions is a key parameter for luminosity. Hence, the emittance of the beams from the injector complex needs to be preserved as well as possible throughout the cycle for maximum luminosity. Moreover, due to the V/H crossing scheme in IP1 and 5, non-...

Descripción completa

Detalles Bibliográficos
Autores principales: Hostettler, M, Antoniou, F, Efthymiopoulos, I, Fuchsberger, K, Iadarola, G, Karastathis, N, Papadopoulou, S, Papaphilippou, Y, Pellegrini, D
Lenguaje:eng
Publicado: 2019
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/2813547
_version_ 1780973412605231104
author Hostettler, M
Antoniou, F
Efthymiopoulos, I
Fuchsberger, K
Iadarola, G
Karastathis, N
Papadopoulou, S
Papaphilippou, Y
Pellegrini, D
author_facet Hostettler, M
Antoniou, F
Efthymiopoulos, I
Fuchsberger, K
Iadarola, G
Karastathis, N
Papadopoulou, S
Papaphilippou, Y
Pellegrini, D
author_sort Hostettler, M
collection CERN
description The emittance of the LHC beams when arriving in collisions is a key parameter for luminosity. Hence, the emittance of the beams from the injector complex needs to be preserved as well as possible throughout the cycle for maximum luminosity. Moreover, due to the V/H crossing scheme in IP1 and 5, non-round emittances yield different luminosities for ATLAS and CMS. Such a difference was e.g. observed in 2016 proton physics operation. This contribution analyzes the emittance evolution throughout the LHC nominal cycle in 2017. The emittance growth from injection to collisions is studied and the different emittance measurements are compared. Reproducible bunch patterns are shown and differences between the operational beam types (BCMS, 8b4e) are highlighted. Also, the roundness of the beams and the impact on the ATLAS to CMS luminosity ratio is assessed.
id cern-2813547
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2019
record_format invenio
spelling cern-28135472022-06-26T21:06:19Zhttp://cds.cern.ch/record/2813547engHostettler, MAntoniou, FEfthymiopoulos, IFuchsberger, KIadarola, GKarastathis, NPapadopoulou, SPapaphilippou, YPellegrini, DEmittance Evolution in the LHC: From Injection to CollisionsAccelerators and Storage RingsThe emittance of the LHC beams when arriving in collisions is a key parameter for luminosity. Hence, the emittance of the beams from the injector complex needs to be preserved as well as possible throughout the cycle for maximum luminosity. Moreover, due to the V/H crossing scheme in IP1 and 5, non-round emittances yield different luminosities for ATLAS and CMS. Such a difference was e.g. observed in 2016 proton physics operation. This contribution analyzes the emittance evolution throughout the LHC nominal cycle in 2017. The emittance growth from injection to collisions is studied and the different emittance measurements are compared. Reproducible bunch patterns are shown and differences between the operational beam types (BCMS, 8b4e) are highlighted. Also, the roundness of the beams and the impact on the ATLAS to CMS luminosity ratio is assessed. oai:cds.cern.ch:28135472019
spellingShingle Accelerators and Storage Rings
Hostettler, M
Antoniou, F
Efthymiopoulos, I
Fuchsberger, K
Iadarola, G
Karastathis, N
Papadopoulou, S
Papaphilippou, Y
Pellegrini, D
Emittance Evolution in the LHC: From Injection to Collisions
title Emittance Evolution in the LHC: From Injection to Collisions
title_full Emittance Evolution in the LHC: From Injection to Collisions
title_fullStr Emittance Evolution in the LHC: From Injection to Collisions
title_full_unstemmed Emittance Evolution in the LHC: From Injection to Collisions
title_short Emittance Evolution in the LHC: From Injection to Collisions
title_sort emittance evolution in the lhc: from injection to collisions
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/2813547
work_keys_str_mv AT hostettlerm emittanceevolutioninthelhcfrominjectiontocollisions
AT antoniouf emittanceevolutioninthelhcfrominjectiontocollisions
AT efthymiopoulosi emittanceevolutioninthelhcfrominjectiontocollisions
AT fuchsbergerk emittanceevolutioninthelhcfrominjectiontocollisions
AT iadarolag emittanceevolutioninthelhcfrominjectiontocollisions
AT karastathisn emittanceevolutioninthelhcfrominjectiontocollisions
AT papadopoulous emittanceevolutioninthelhcfrominjectiontocollisions
AT papaphilippouy emittanceevolutioninthelhcfrominjectiontocollisions
AT pellegrinid emittanceevolutioninthelhcfrominjectiontocollisions

Ejemplares similares