Impact of the First Powering Cycles on the LHC Superconducting Dipole Coil Geometry

Author

Calvi, M. ; Todesco, E. ; Bottura, L. ; Sanfilippo, S. ; Siemko, A.

Author_Institution

CERN, Geneva

Volume

16

Issue

2

fYear

2006

fDate

6/1/2006 12:00:00 AM

Firstpage

184

Lastpage

187

Abstract

The impact of the first powering cycles on the LHC superconducting dipoles coil geometry has been investigated. Dedicated magnetic measurements have been performed to estimate the changes in the geometric component of the harmonics, caused by the last highest Lorentz force the coil has ever experienced. Several magnets have been powered at increasing current steps while the field quality has been measured to quantify the changes in geometry. The effect of the thermal cycles has been also considered as well as the systematic differences between measurements before and after the quench training. The reconstruction of the coil geometry variations is discussed in terms of continuous modes of deformation as well as single block displacements

Keywords

accelerator magnets; storage rings; superconducting coils; superconducting magnets; synchrotrons; LHC; Lorentz force; field quality; first powering cycles; harmonics; magnetic measurements; quench training; single block displacements; superconducting dipole coil geometry; thermal cycles; Current measurement; Geometry; Large Hadron Collider; Lorentz covariance; Magnetic field measurement; Magnetic variables measurement; Performance evaluation; Superconducting coils; Superconducting magnets; Thermal quenching; Field quality; LHC; superconductivity;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2005.864262

Filename

1642821