ICAP-2002 Abstracts and Posters

ICAP 2002 Abstracts and Posters

CROSS SECTION DEFORMATIONS IN THE SUPERCONDUCTING DIPOLE OF THE LARGE HADRON COLLIDER

Abstract

The LHC main dipole is a 15 m-long 0.5 m-wide cylindrical structure made of iron and steel laminations surrounding the superconducting cables. During the energization phase, and the nominal condition as well, Lorentz forces arising in the cables can provoke cross section deformations and consequent field quality decaying. In this paper we present a detailed finite element model of the cross section developed at CERN to study a wide range of structural and magnetic phenomena. To validate it we computed the mechanical stresses induced by the coils at different powering steps up to the nominal field and the consequent diameter variation of the cold mass. In conclusion, results have been compared to direct observations taken during the energization of the "test string 2" by an optical device based on interferometric technology.

J. Garcia Perez,M. La China,W. Scandale

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