Next generation LLRF control system for J-PARC RCS

Tamura, Fumihiko   ; Sugiyama, Yasuyuki*; Yoshii, Masahito*; Omori, Chihiro*; Yamamoto, Masanobu   ; Nomura, Masahiro  ; Shimada, Taihei ; Hasegawa, Katsushi*; Hara, Keigo*; Furusawa, Masashi*

The LLRF control system for the J-PARC RCS has been playing important roles for acceleration of high intensity proton beams. The key functions of the system are the dual harmonic voltage control and the multiharmonic rf feedforward to compensate the heavy beam loading in the wideband cavities. The system has been working fine for more than ten years, however, the old FPGAs in the system are already discontinued and not supported by current development environment. Maintenance of the system will be difficult soon. We are developing the next generation LLRF control system with the new form factor, MicroTCA.4, while the existing system is based on the VME. In this article, we describe the configuration of the new system, its functions, and the status of the development.