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Impact of Coil Deformations on Field Quality in the Large Hadron Collider Main Dipole

In superconducting accelerator magnets the coils are usually pre-stressed in order to avoid conductor movements induced by electro-magnetic forces. In this paper we use a finite element mechanical model of the main LHC dipole to evaluate the coil deformations determined by the pre-stress and their i...

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Detalles Bibliográficos
Autores principales: Ferracin, P, Pagano, O, Remondino, Vittorio, Scandale, Walter, Todesco, Ezio, Tommasini, D
Lenguaje:eng
Publicado: 2002
Materias:
Acceso en línea:https://dx.doi.org/10.1109/TASC.2002.1018741
http://cds.cern.ch/record/544807
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author Ferracin, P
Pagano, O
Remondino, Vittorio
Scandale, Walter
Todesco, Ezio
Tommasini, D
author_facet Ferracin, P
Pagano, O
Remondino, Vittorio
Scandale, Walter
Todesco, Ezio
Tommasini, D
author_sort Ferracin, P
collection CERN
description In superconducting accelerator magnets the coils are usually pre-stressed in order to avoid conductor movements induced by electro-magnetic forces. In this paper we use a finite element mechanical model of the main LHC dipole to evaluate the coil deformations determined by the pre-stress and their impact on magnetic field quality. The model explains the origin of the offsets between the nominal multipole values and those measured at room temperature in prototype and pre-series dipole magnets. We also present an experiment carried out to analyse the impact on field quality and coil stresses of coil azimuthal spacers (pole shims). A 1 m long dipole collared coil has been re-assembled several times with pole shims of different thickness and the field components have been measured each time. Experimental data are compared to numerical computations based on the mechanical model.One finds that variations of shim thickness induce not only a change of the azimuthal coil length, but also a different pattern in coil deformations. A good agreement is found between measurements and simulations.
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language eng
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spelling cern-5448072023-05-31T13:20:03Zdoi:10.1109/TASC.2002.1018741http://cds.cern.ch/record/544807engFerracin, PPagano, ORemondino, VittorioScandale, WalterTodesco, EzioTommasini, DImpact of Coil Deformations on Field Quality in the Large Hadron Collider Main DipoleAccelerators and Storage RingsIn superconducting accelerator magnets the coils are usually pre-stressed in order to avoid conductor movements induced by electro-magnetic forces. In this paper we use a finite element mechanical model of the main LHC dipole to evaluate the coil deformations determined by the pre-stress and their impact on magnetic field quality. The model explains the origin of the offsets between the nominal multipole values and those measured at room temperature in prototype and pre-series dipole magnets. We also present an experiment carried out to analyse the impact on field quality and coil stresses of coil azimuthal spacers (pole shims). A 1 m long dipole collared coil has been re-assembled several times with pole shims of different thickness and the field components have been measured each time. Experimental data are compared to numerical computations based on the mechanical model.One finds that variations of shim thickness induce not only a change of the azimuthal coil length, but also a different pattern in coil deformations. A good agreement is found between measurements and simulations.LHC-Project-Report-544CERN-LHC-Project-Report-544oai:cds.cern.ch:5448072002-03-06
spellingShingle Accelerators and Storage Rings
Ferracin, P
Pagano, O
Remondino, Vittorio
Scandale, Walter
Todesco, Ezio
Tommasini, D
Impact of Coil Deformations on Field Quality in the Large Hadron Collider Main Dipole
title Impact of Coil Deformations on Field Quality in the Large Hadron Collider Main Dipole
title_full Impact of Coil Deformations on Field Quality in the Large Hadron Collider Main Dipole
title_fullStr Impact of Coil Deformations on Field Quality in the Large Hadron Collider Main Dipole
title_full_unstemmed Impact of Coil Deformations on Field Quality in the Large Hadron Collider Main Dipole
title_short Impact of Coil Deformations on Field Quality in the Large Hadron Collider Main Dipole
title_sort impact of coil deformations on field quality in the large hadron collider main dipole
topic Accelerators and Storage Rings
url https://dx.doi.org/10.1109/TASC.2002.1018741
http://cds.cern.ch/record/544807
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