J-PARC linac and RCS – operational status and upgrade plan to 2 MW

Article type: Brief Report

Authors: Yamamoto, Kazami^{a; *} | Moriya, Katsuhiro^a | Okita, Hidefumi^a | Yamada, Ippei^a | Chimura, Motoki^a | Saha, Pranab Kumar^a | Shobuda, Yoshihiro^a | Tamura, Fumihiko^a | Yamamoto, Masanobu^a | Morishita, Takatoshi^a | Hotchi, Hideaki^b | Liu, Yong^b

Affiliations: [a] J-PARC Center, Japan Atomic Energy Agency, Tokai-mura, Ibaraki, Japan | [b] J-PARC Center, High-Energy Accelerator Research Organization, Tokai-mura, Ibaraki, Japan

Correspondence: [*] Corresponding author. E-mail: kazami@post.j-parc.jp.

Abstract: The linac and the 3 GeV rapid-cycling synchrotron (RCS) at the Japan Proton Accelerator Research Complex (J-PARC) were designed to provide 1-MW proton beams to the following facilities. Due to the improvement of the accelerator system, we accelerated a 1-MW beam with a small beam loss. The lack of anode current in the radiofrequency (RF) cavity, rather than beam loss, limits the RCS beam power. Recently, we developed a new acceleration cavity that can accelerate a beam with a low anode current. This new cavity enables us to reduce the requirement for the anode power supply and accelerate a beam of more than 1 MW. We considered how to achieve beam acceleration beyond 1 MW. So far, a beam of up to 1.5 MW is expected to be accelerated after replacing the RF cavity. We also studied to achieve an up to 2 MW beam in J-PARC RCS.

DOI: 10.3233/JNR-240003

Journal: Journal of Neutron Research, vol. 26, no. 2-3, pp. 59-67, 2024