Variable Permanent Magnet Quadrupole

Author

Mihara, T. ; Iwashita, Y. ; Kumada, M. ; Spencer, C.M.

Author_Institution

Kyoto Univ.

Volume

16

Issue

2

fYear

2006

fDate

6/1/2006 12:00:00 AM

Firstpage

224

Lastpage

227

Abstract

A permanent magnet quadrupole (PMQ) is one of the candidates for the final focus lens in a linear collider. An over 120 T/m strong variable permanent magnet quadrupole is achieved by the introduction of saturated iron and a ´double ring structure´. A fabricated PMQ achieved 24 T integrated gradient with phi20 mm bore diameter, phi100 mm magnet diameter and 20 cm pole length. The strength of the PMQ is adjustable in 1.4 T steps, due to its ´double ring structure´: the PMQ is split into two nested rings; the outer ring is sliced along the beam line into four parts and is rotated to change the strength. This paper describes the variable PMQ from fabrication to recent adjustments

Keywords

accelerator magnets; linear colliders; particle beam focusing; permanent magnets; 24 T; accelerator magnets; double ring structure; focus lens; integrated gradient; linear accelerators; linear collider; magnet diameter; pole length; strong variable permanent magnet quadrupole; Accelerator magnets; Boring; Fabrication; Iron; Lenses; Linear accelerators; Magnetic fields; Permanent magnets; Saturation magnetization; Switches; Accelerator magnets; accelerators; linear accelerators; permanent magnets;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2006.873248

Filename

1642831