Lowlevel RF Control System of J-PARC Synchrotrons

Author

Tamura, Fumihiko ; Schnase, Alexander ; Nomura, Masahiro ; Yamamoto, Masanobu ; Yoshii, Masahito ; Anami, Shozo ; Ezura, Eizi ; Hara, Keigo ; Ohmori, Chihiro ; Takagi, Akira

Author_Institution

JAERI, Tokai-mura, Ibaraki-ken, Japan 319-1195, ftamura@linac.tokai.jaeri.go.jp

fYear

2005

fDate

16-20 May 2005

Firstpage

3624

Lastpage

3626

Abstract

We present the concept and the design of the low level RF (LLRF) control system of the J-PARC synchrotrons. The J-PARC synchrotrons are the rapid cycling 3-GeV synchrotron (RCS) and the 50-GeV main ring (MR) which require very precise and stable LLRF control systems to accelerate the ultra-high proton beam current. The LLRF system of the synchrotron is a full-digital system based on direct digital synthesis (DDS). The functions of the system are (1) the multi-harmonic RF generation for the acceleration and the longitudinal bunch shaping, (2) the feedbacks for stabilizing the beam, (3) the feedforward for compensating the heavy beam loading, and (4) other miscellaneous functions such as the synchronization and chopper timing. The LLRF system of the RCS is now under construction. We present the details of the system. Also, we show preliminary results of performance tests of the control modules.

Keywords

Acceleration; Choppers; Control system synthesis; Control systems; Feedback; Particle beams; Radio frequency; Structural beams; Synchrotrons; Timing;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the

Print_ISBN

0-7803-8859-3

Type

conf

DOI

10.1109/PAC.2005.1591560

Filename

1591560