Field shape variation induced by thermal and electromagnetic forces in the 5-block 10 m long LHC dipole models

The field shape of three 5-block 10m long two-in-one LHC dipole models has been measured before and after the first training cycle. A Systematic variation is observed in the normal sextupole and decapole components in all coils. We show that this effect is induced by outward radial movements of four...

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Detalles Bibliográficos
Autores principales: Pagano, O, Scandale, Walter, Todesco, Ezio
Lenguaje:eng
Publicado: 1999
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/692078
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author Pagano, O
Scandale, Walter
Todesco, Ezio
author_facet Pagano, O
Scandale, Walter
Todesco, Ezio
author_sort Pagano, O
collection CERN
description The field shape of three 5-block 10m long two-in-one LHC dipole models has been measured before and after the first training cycle. A Systematic variation is observed in the normal sextupole and decapole components in all coils. We show that this effect is induced by outward radial movements of four blocks of the inner coil. Tests with Fuji paper confirm our interpretation. Other random variation of the multipoles, mainly normal and skew quadrupole, are shown to be compatible with random displacement of the coil characterised by an r.m.s. value of 12-25µm. Scaling laws for multipoles induced by random displacements are worked out.
id cern-692078
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1999
record_format invenio
spelling cern-6920782023-05-31T13:25:29Zhttp://cds.cern.ch/record/692078engPagano, OScandale, WalterTodesco, EzioField shape variation induced by thermal and electromagnetic forces in the 5-block 10 m long LHC dipole modelsAccelerators and Storage RingsThe field shape of three 5-block 10m long two-in-one LHC dipole models has been measured before and after the first training cycle. A Systematic variation is observed in the normal sextupole and decapole components in all coils. We show that this effect is induced by outward radial movements of four blocks of the inner coil. Tests with Fuji paper confirm our interpretation. Other random variation of the multipoles, mainly normal and skew quadrupole, are shown to be compatible with random displacement of the coil characterised by an r.m.s. value of 12-25µm. Scaling laws for multipoles induced by random displacements are worked out.LHC-PROJECT-NOTE-180oai:cds.cern.ch:6920781999-02-23
spellingShingle Accelerators and Storage Rings
Pagano, O
Scandale, Walter
Todesco, Ezio
Field shape variation induced by thermal and electromagnetic forces in the 5-block 10 m long LHC dipole models
title Field shape variation induced by thermal and electromagnetic forces in the 5-block 10 m long LHC dipole models
title_full Field shape variation induced by thermal and electromagnetic forces in the 5-block 10 m long LHC dipole models
title_fullStr Field shape variation induced by thermal and electromagnetic forces in the 5-block 10 m long LHC dipole models
title_full_unstemmed Field shape variation induced by thermal and electromagnetic forces in the 5-block 10 m long LHC dipole models
title_short Field shape variation induced by thermal and electromagnetic forces in the 5-block 10 m long LHC dipole models
title_sort field shape variation induced by thermal and electromagnetic forces in the 5-block 10 m long lhc dipole models
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/692078
work_keys_str_mv AT paganoo fieldshapevariationinducedbythermalandelectromagneticforcesinthe5block10mlonglhcdipolemodels
AT scandalewalter fieldshapevariationinducedbythermalandelectromagneticforcesinthe5block10mlonglhcdipolemodels
AT todescoezio fieldshapevariationinducedbythermalandelectromagneticforcesinthe5block10mlonglhcdipolemodels

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