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...
Autores principales: | , , , , |
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Lenguaje: | eng |
Publicado: |
2001
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Materias: | |
Acceso en línea: | http://cds.cern.ch/record/514351 |
_version_ | 1780897589729689600 |
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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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