Measurement of the Paint Magnets for the Beam Painting Injection System in the J-PARC 3-GeV RCS

Author

Takayanagi, T. ; Kanazawa, K. ; Ueno, T. ; Someya, H. ; Harada, H. ; Irie, Y. ; Kinsho, M. ; Yamazaki, Y. ; Yoshimoto, M. ; Kamiya, J. ; Watanabe, M. ; Kuramochi, M.

Author_Institution

JAEA J-PARC, Tokai

Volume

18

Issue

2

fYear

2008

fDate

6/1/2008 12:00:00 AM

Firstpage

310

Lastpage

313

Abstract

The beam painting injection system of the 3-GeV RCS in J-PARC, which realizes the uniform beam distributions in the ring, consists of four horizontal paint bump magnets and two vertical paint magnets. The power supply of the paint bump magnet is required to excite the current with high accuracy that varies from 17.6 kA to zero during 0.5 ms. The IGBT chopper units, a switching frequency of which is 50 kHz each, are multiply-connected to achieve the effective carrier frequency of 600 kHz. Accordingly, the output accuracy of the exciting current has been achieved to be less than 1.0%. The measurements of the magnetic field with the actual current waveform were performed and the good performance was confirmed.

Keywords

accelerator magnets; choppers (circuits); insulated gate bipolar transistors; synchrotrons; IGBT chopper units; J-PARC RCS; beam painting injection system; current 0 kA to 17.6 kA; electron volt energy 3 GeV; exciting current; frequency 50 kHz; frequency 600 kHz; magnetic field measurement; paint bump magnets; rapid cycling synchrotron; time 0.5 ms; uniform beam distributions; 3-GeV RCS in J-PARC; IGBT; measurement of the magnetic field and exciting current; paint bump;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2008.920771

Filename

4515903