Trends in cable magnetization and persistent currents during the production of the main dipoles of the Large Hadron Collider

  title={Trends in cable magnetization and persistent currents during the production of the main dipoles of the Large Hadron Collider},
  author={Boris Bellesia and Luca Bottura and V. Granata and Sandrine Le Naour and L. R. Oberli and St{\'e}phane Sanfilippo and Claudio Santoni and Walter Scandale and Nikolai Schwerg and Ezio Todesco and Christine Vollinger},
  journal={IEEE Transactions on Applied Superconductivity},
The production of more than 60% of superconducting cables for the main dipoles of the Large Hadron Collider has been completed. The results of the measurements of cable magnetization and the dependence on the manufacturers are presented. The strand magnetization produces field errors that have been measured in a large number of dipoles (approximately 100 to date) tested in cold conditions. We examine here the correlation between the available magnetic measurements and the large database of… 

Correlation between magnetic field quality and mechanical components of the Large Hadron Collider main dipoles

The 1234 superconducting dipoles of the Large Hadron Collider, working at a cryogenic temperature of 1.9 K, must guarantee a high quality magnetic field to steer the particles inside the beam pipe.

Magnetic Performance of the Main Superconducting Magnets for the LHC

The field strength and homogeneity of all the LHC superconducting magnets were measured as a part of the production control and qualification process that has taken place during the past four years.

Development of a Current Fit Function for NbTi to be Used for Calculation of Persistent Current Induced Field Errors in the LHC Main Dipoles

A new fit function for the critical current density of superconducting NbTi cables for the LHC main dipoles is presented. Existing fit functions usually show a good matching of the very low field

Fast Method to Quantify the Collective Magnetization in Superconducting Magnets

The magnetization of the superconductor is one of the most important parameters determining the field quality of accelerator magnets. A fast method to quantify the magnetization effect in an entire

A success story: LHC cable production at ALSTOM-MSA



Cable Magnetization Effects in the LHC Main Dipole Magnets

Several short (1 m) and long (10 m) dipole models have been tested within the scope of the on-going R&D programme for LHC at CERN. We report here the results of measurements of field quality,


We have measured the magnetic field of a large fraction of the LHC main dipoles, to date more than 400 in warm conditions and over 100 in cold conditions. Using the available data we analysed the

Status of the LHC superconducting cable mass production

Six contracts have been placed with industrial companies for the production of 1200 tons of the superconducting (SC) cables needed for the main dipoles and quadrupoles of the Large Hadron Collider

Steering field quality in the main dipole magnets of the Large Hadron Collider

More than 10% of the collared coils of the main LHC dipoles have been produced. In this paper, we compare the measured field quality to beam dynamics targets using correlations to measurements at 1.9


The construction of the LHC superconducting magnets is approaching its half way to completion. At the end of 2003, main dipoles cold masses for more than one octant were delivered; meanwhile the

Industrial Technology for Unprecented Energy and Luminosity : The Large Hadron Collider

With over 3 billion Swiss francs procurement contracts under execution in industry and the installation of major technical systems in its first 3.3 km sector, the Large Hadron Collider (LHC)

Field quality specification for the LHC main dipole magnets

Based on criteria of different nature such as the control of the mechanical aperture or the preservation of the dynamic aperture, hard limits are given for the normal and skew harmonics an and bn, 1

A vector hysteresis model for superconducting filament magnetization in accelerator magnets

Magnetic field changes in the coils of superconducting magnets are shielded from the filaments' core by so-called persistent currents which can be modeled by means of the critical state model. This

Status of the LHC superconducting cable production

  • IEEE Trans. Appl. Supercond., vol. 12, pp. 1056–1062, Mar. 2002.
  • 2002