Field errors decay and "snap-back" in LHC model dipoles

Author

Bottura, L. ; Walckiers, L. ; Wolf, R.

Author_Institution

CERN, Geneva, Switzerland

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

602

Lastpage

605

Abstract

The magnetic field in accelerator magnets decays when the current is kept constant during the particles injection phase, and returns quickly (snaps back) to the original values as soon as ramping is restarted. Here we show results of measurements of the decay of the field errors in 10 m long LHC model dipole magnets. In accordance with previous findings, precycles and stops at intermediate current levels influence the decay. We discuss a possible mechanism causing the decay and snap-back, based on the internal field change in the cable.

Keywords

accelerator magnets; colliding beam accelerators; particle beam injection; proton accelerators; storage rings; superconducting cables; superconducting magnets; synchrotrons; 10 m; LHC model dipoles; Large Hadron Collider; accelerator magnets; cable internal field change; field errors decay; intermediate current levels; magnetic field; particles injection phase; ramping restart; snap-back; superconducting accelerator magnets; Accelerator magnets; Creep; Current measurement; Large Hadron Collider; Magnetic field measurement; Magnetic fields; Magnetic flux; Magnetization; Superconducting cables; Superconducting magnets;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.614576

Filename

614576