Long Term Stability of the LHC Superconducting Cryodipoles After Outdoor Storage

The main superconducting dipoles for the LHC are being stored outdoors for periods from a few weeks to several years after conditioning with dry nitrogen gas. Such a storage before installation in the 27 km circumference tunnel may affect not only the mechanical and cryogenic functionality of the cr...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2006-06, Vol.16 (2), p.180-183
Main Authors: Seyvet, F., Izquierdo, G.A., Bertarelli, A., Denis, O., El-Kallassi, P., Cano, E.D.F., Fessia, P., Ilie, S.D., Jeanneret, J.B., Letant, D., Poncet, A., Pugnat, P., Savary, F., Sgobba, S., Siemko, A., Todesco, E., Tommasini, D., Veness, R., Vullierme, B., Wildner, E.
Format: Article
Language:English
Subjects:
Applied sciences
Cold storage
Cryogenic quenching
Cryogenics
Cyclic accelerators and storage rings
Degradation
Dielectrics and electrical insulation
electrical engineering
Electrical engineering. Electrical power engineering
Electromagnets
Exact sciences and technology
Experimental methods and instrumentation for elementary-particle and nuclear physics
Insulation
Large Hadron Collider
Long term
Magnetic fields
Magnetic materials
materials science and technology
Nitrogen
Nuclear physics
Outdoor
Physics
Stability
superconducting accelerator magnets
Superconducting magnets
Superconductivity
Thermal force
Thermal quenching
Various equipment and components
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The main superconducting dipoles for the LHC are being stored outdoors for periods from a few weeks to several years after conditioning with dry nitrogen gas. Such a storage before installation in the 27 km circumference tunnel may affect not only the mechanical and cryogenic functionality of the cryodipoles but also their quench and field performance. A dedicated task force was established to study all aspects of long term behavior of the stored cryodipoles, with particular emphasis on electrical and vacuum integrity, quench training behavior, magnetic field quality, performance of the thermal insulation, mechanical stability of magnet shape and of the interface between cold mass and cryostat, degradation of materials and welds. In particular, one specifically selected cryodipole stored outdoors for more than one year, was re-tested at cold. In addition, various tests have been carried out on the cryodipole assembly and on the most critical subcomponents to study aspects such as the hygrothermal behavior of the supporting system and the possible oxidation of the Multi Layer Insulation reflective films. This paper summarizes the main investigations carried out and their results
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2006.870494