Magnetic design of large-bore superconducting quadrupoles for the AHF

Author

Andreev, Nikolai ; Jason, Andrew ; Kashikhin, Vladimir S. ; Kashikhin, V.V. ; Limon, Peter J. ; Tompkins, John ; Walstrom, Peter

Author_Institution

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

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

1361

Lastpage

1364

Abstract

The Advanced Hydrotest Facility (AHF), under study by LANL, utilizes large-bore superconducting quadrupole magnets to image protons for radiography of fast events. The lens system uses two types of quadrupoles: a large bore (48-cm beam aperture) for wide field of view imaging and a smaller bore (23 cm aperture) for higher resolution images. The gradients of the magnets are 10.14 T/m and 18.58 T/m with magnetic lengths of 4.3 m and 3.0 m, respectively. The magnets are sufficiently novel to present a design challenge. Evaluation and comparisons were made for various types of magnet design: shell and racetrack coils, cold and warm iron, as well as an active superconducting shield. Nb₃Sn cable was considered as an alternative to NbTi to avoid quenching under high beam-scattering conditions. Several options are discussed and compared.

Keywords

accelerator magnets; proton beams; radiography; superconducting magnets; Advanced Hydrotest Facility; Nb₃Sn; Nb₃Sn cable; NbTi; NbTi cable; active superconducting shield; cold iron yoke; imaging system; large-bore superconducting quadrupole magnet; lens system; proton radiography; racetrack coil; shell coil; warm iron yoke; Apertures; Boring; High-resolution imaging; Image resolution; Lenses; Protons; Radiography; Superconducting cables; Superconducting coils; Superconducting magnets;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.812670

Filename

1211851