Design and Fabrication of an RCS Magnet Coil Using a Stranded Conductor of J-PARC 3-GeV Synchrotron

Author

Tani, N. ; Watanabe, Y. ; Suzuki, H. ; Adachi, T. ; Someya, H. ; Igarashi, S. ; Nakamura, K. ; Watanabe, T.

Author_Institution

Japan Atomic Energy Res. Inst., Tokai

Volume

18

Issue

2

fYear

2008

fDate

6/1/2008 12:00:00 AM

Firstpage

314

Lastpage

317

Abstract

The 3-GeV synchrotron now being constructed in the JAERI/KEK Joint Project is a rapid-cycling synchrotron (RCS), which accelerates a high-intensity proton beam from 400-MeV to 3-GeV at a repetition rate of 25-Hz. Magnet coils of the RCS synchrotron are fabricated by using a stranded conductor. As a magnet coil, a hollow conductor that has a cooling water channel is widely used. However since RCS magnet is excited with a rapid cycle, heat of coil conductor caused by eddy current becomes a problem. Therefore, in order to reduce eddy current loss of coil conductor, we used a stranded conductor that consists of many electrically-isolated thin wires wrapped around a cooling water pipe as a coil conductor. This is a conductor developed at KEK as a coil conductor excited with a rapid cycle and was further developed to the stage of mass production. In this paper, we will report design and fabrication of an RCS magnet coil using a stranded conductor.

Keywords

accelerator magnets; eddy current losses; superconducting coils; superconducting magnets; coil conductor; cooling water channel; eddy current loss; electrically-isolated thin wires; electron volt energy 3 GeV; electron volt energy 400 MeV; frequency 25 Hz; high-intensity proton beam; hollow conductor; magnet coil; rapid-cycling synchrotron; stranded conductor; A rapid-cycling synchrotron; Eddy current; J-PARC; high intensity accelerator; magnet coil;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2008.920829

Filename

4520258