Title :
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
fDate :
6/1/2006 12:00:00 AM
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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2005.864262
