Measurements of magnetic field pattern in a short LHC dipole model

Author

Bottura, Luca ; Breschi, Marco ; Schneider, Michael

Author_Institution

LHC Div., CERN, Geneva, Switzerland

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

1605

Lastpage

1608

Abstract

The magnetic field in superconducting accelerator magnets has a fine structure with longitudinal periodicity. This periodic pattern, with period identical to the cable twist pitch, is originated by uneven current distribution within the cable. Here, the authors present results of measurements of the periodic pattern performed in an LHC dipole model. They report in particular the results obtained powering the magnet with simple current steps and typical operation cycles as will be used during accelerator operation. The main result of the analysis is the time variation of the amplitude of the periodic pattern, from which they infer the evolution of the current distribution in the cable. They discuss the dependence of the pattern amplitude on ramp and pre-cycle parameters

Keywords

accelerator magnets; colliding beam accelerators; current distribution; magnetic field measurement; magnetic fields; superconducting cables; superconducting magnets; Large Hadron Collider; cable twist pitch; fine structure; longitudinal periodicity; magnet powering; magnetic field; magnetic field pattern measurements; pattern amplitude; pre-cycle parameters; ramp parameters; short LHC dipole model; superconducting accelerator magnets; superconducting cable current distribution; Accelerator magnets; Current distribution; Large Hadron Collider; Magnetic analysis; Magnetic field measurement; Pattern analysis; Performance evaluation; Power cables; Superconducting cables; Superconducting magnets;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.920086

Filename

920086