Currents in, Forces on and Deformations/Displacements of the LHC Beam Screen Expected during a Magnet Quench

Due to the field asymmetry of the LHC dipoles, the magnetic field integral calculated from the centre of the aperture to the outside of the cold mass does not vanish. During a magnet quench this asymmetry generates an electromotive force and thus a current with a resultant lateral force on the beam...

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Autores principales: Caspers, Friedhelm, Pugnat, P, Rathjen, C, Russenschuck, Stephan, Siemko, A
Lenguaje:eng
Publicado: 2001
Materias:
Acceso en línea:http://cds.cern.ch/record/514351
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author Caspers, Friedhelm
Pugnat, P
Rathjen, C
Russenschuck, Stephan
Siemko, A
author_facet Caspers, Friedhelm
Pugnat, P
Rathjen, C
Russenschuck, Stephan
Siemko, A
author_sort Caspers, Friedhelm
collection CERN
description Due to the field asymmetry of the LHC dipoles, the magnetic field integral calculated from the centre of the aperture to the outside of the cold mass does not vanish. During a magnet quench this asymmetry generates an electromotive force and thus a current with a resultant lateral force on the beam screen. This induced force was observed indirectly when measuring the deformation of the beam screen cross-section during a quench using a precision displacement transducer, which will be described. The transducer (based on optical gratings) was developed specially to study the beam screen deformation in cryogenic environments and high magnetic fields. The results of the measurements are compared to calculations and to direct measurements of the induced voltage along the current path. An estimation of the forces exerted on the cold bore by the beam screen and of the actual current induced in the beam screen will be given.
id cern-514351
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2001
record_format invenio
spelling cern-5143512023-05-31T13:21:43Zhttp://cds.cern.ch/record/514351engCaspers, FriedhelmPugnat, PRathjen, CRussenschuck, StephanSiemko, ACurrents in, Forces on and Deformations/Displacements of the LHC Beam Screen Expected during a Magnet QuenchAccelerators and Storage RingsDue to the field asymmetry of the LHC dipoles, the magnetic field integral calculated from the centre of the aperture to the outside of the cold mass does not vanish. During a magnet quench this asymmetry generates an electromotive force and thus a current with a resultant lateral force on the beam screen. This induced force was observed indirectly when measuring the deformation of the beam screen cross-section during a quench using a precision displacement transducer, which will be described. The transducer (based on optical gratings) was developed specially to study the beam screen deformation in cryogenic environments and high magnetic fields. The results of the measurements are compared to calculations and to direct measurements of the induced voltage along the current path. An estimation of the forces exerted on the cold bore by the beam screen and of the actual current induced in the beam screen will be given.LHC-Project-Report-489CERN-LHC-Project-Report-489oai:cds.cern.ch:5143512001-08-06
spellingShingle Accelerators and Storage Rings
Caspers, Friedhelm
Pugnat, P
Rathjen, C
Russenschuck, Stephan
Siemko, A
Currents in, Forces on and Deformations/Displacements of the LHC Beam Screen Expected during a Magnet Quench
title Currents in, Forces on and Deformations/Displacements of the LHC Beam Screen Expected during a Magnet Quench
title_full Currents in, Forces on and Deformations/Displacements of the LHC Beam Screen Expected during a Magnet Quench
title_fullStr Currents in, Forces on and Deformations/Displacements of the LHC Beam Screen Expected during a Magnet Quench
title_full_unstemmed Currents in, Forces on and Deformations/Displacements of the LHC Beam Screen Expected during a Magnet Quench
title_short Currents in, Forces on and Deformations/Displacements of the LHC Beam Screen Expected during a Magnet Quench
title_sort currents in, forces on and deformations/displacements of the lhc beam screen expected during a magnet quench
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/514351
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