Field quality in the twin aperture D2 dipoles for LHC under asymmetric excitation

Author

Jain, A. ; Wanderer, P. ; Willen, E.

Author_Institution

BNL, Upton, NY, USA

Volume

5

fYear

1999

fDate

1999

Firstpage

3173

Abstract

Twin aperture D2 magnets are one of the several types of dipoles to be built by BNL for the interaction regions of LHC. To minimize the number of dipole correctors required in the interaction regions, D2 will also be used as part of the steering system. Consequently, the operating fields in the two apertures may differ by up to ~10% at 7 TeV operation and ~33% at injection in order to compensate for the strengths of the correctors that would otherwise be required. Such asymmetric excitation of the two apertures may induce undesirable field harmonics. The saturation behavior of various harmonics is studied using POISSON and OPERA-2D. It is shown that the changes in harmonics resulting from the anticipated asymmetry are within tolerable limits

Keywords

accelerator magnets; colliding beam accelerators; proton accelerators; storage rings; superconducting magnets; LHC; OPERA-2D; POISSON; asymmetric excitation; dipole correctors; field harmonics; field quality; interaction regions; saturation behavior; steering system; twin aperture D2 dipoles; Apertures; Coils; Collaboration; Helium; Large Hadron Collider; Magnetic separation; Magnets; Saturation magnetization; Steering systems;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1999. Proceedings of the 1999

Conference_Location

New York, NY

Print_ISBN

0-7803-5573-3

Type

conf

DOI

10.1109/PAC.1999.792240

Filename

792240