Design of the Shift Bump Magnets for the Beam Injection of the 3-GeV RCS in J-PARC

Author

Takayanagi, T. ; Kamiya, J. ; Watanabe, Manabu ; Ueno, T. ; Yamazaki, Y. ; Irie, Y. ; Kishiro, J. ; Sakai, I. ; Kawakubo, T. ; Tounosu, S. ; Chida, Y. ; Watanabe, Manabu ; Watanuki, T.

Author_Institution

JAERI, Ibaraki

Volume

16

Issue

2

fYear

2006

fDate

6/1/2006 12:00:00 AM

Firstpage

1366

Lastpage

1369

Abstract

The injection system of the 3-GeV RCS (Rapid Cycling Synchrotron) in J-PARC (Japan Proton Accelerator Research Complex) consists of four main orbit bump magnets (shift bump) to merge the injection beam with the circulating beam. In order to control the injection beam with sufficient accuracy, the shift bump magnets need a wide uniform magnetic field. The magnetic field design and the structural analysis of the shift bump magnets have been performed using three-dimensional electromagnetic and mechanical analysis codes. The shift bump magnets have realized a uniform field with less than 0.35% inhomogeneity over a wider area, which is 400 mm in width and 240 mm in height. Furthermore, the magnets operate with a high magnetic field and they are located in high radioactive level area. The flexible bar is applied to the coil as the countermeasure for thermal expansion and the insulator has strong radiation resistance

Keywords

accelerator magnets; particle beam injection; proton accelerators; synchrotrons; thermal expansion; 240 mm; 3 GeV; 400 mm; J-PARC; Japan Proton Accelerator Research Complex; RCS; beam injection; beam injection control; circulating beam; flexible bar; inhomogeneity; insulator; magnet structural analysis; magnetic field design; mechanical analysis codes; radiation resistance; radioactive level area; rapid cycling synchrotron; shift bump magnets design; thermal expansion; three-dimensional electromagnetic analysis; wide uniform magnetic field; Electromagnetic analysis; Magnetic analysis; Magnetic fields; Magnets; Particle beam injection; Particle beams; Performance analysis; Proton accelerators; Synchrotrons; Thermal resistance;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2006.870515

Filename

1643106