Design and measurements of prototype Fermilab Main Injector dipole endpacks

Author

Harding, D.J. ; Glass, H.D. ; Ostiguy, J.-F. ; Brown, B.C. ; Harfoush, F.A. ; Mishra, C.S.

Author_Institution

Fermi Nat. Accel. Lab., Batavia, IL, USA

fYear

1993

fDate

17-20 May 1993

Firstpage

2829

Abstract

The end field regions of the dipole for the Fermilab Main Injector contribute significantly to the overall field quality and magnet performance. The end effects which we must control are the variation in effective length as a function of current and the variation in field shape across the magnet aperture. We employed an iterative process of numerical calculations and prototype testing to refine the design of the endpack steel configuration. The final design is an approximation to a Rogowski profile, which limits effective length variation to 1.8 mm per end between 0.1 T and 1.7 T, and includes small shims to compensate for the intrinsic negative sextupole of the ends. We discuss details of the design process and present the effective length, field shape, and harmonics measurements for various endpack designs

Keywords

beam handling equipment; beam handling techniques; electromagnets; iterative methods; proton accelerators; synchrotrons; 0.1 to 1.7 T; Fermilab Main Injector; Rogowski profile; design process; dipole endpacks; effective length; end field regions; endpack steel configuration; field quality; field shape; harmonics measurements; intrinsic negative sextupole; iterative process; magnet aperture; magnet performance; numerical calculations; proton synchrotron; prototype testing; small shims; Apertures; Length measurement; Magnetic field measurement; Process design; Prototypes; Refining; Shape control; Shape measurement; Steel; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1993., Proceedings of the 1993

Conference_Location

Washington, DC

Print_ISBN

0-7803-1203-1

Type

conf

DOI

10.1109/PAC.1993.309475

Filename

309475