Category: Status Report

Speaker: Georg H. Hoffstaetter

Abstract: The first multi-turn Energy Recover Linac (ERL), CBETA, that recovers beam energy in Superconducting Radio Frequency (SRF) resonators utilizes a Fixed Field Alternating-gradient (FFA) optics in its return loop. It has an energy acceptance of nearly 4 and transports beams at 42, 78, 114, and 150 MeV simultaniously. It has been designed, constructed, and commissioned to low currents by Brookhaven National Laboratory (BNL) and Cornell University. An overview of this project will be presented, including design parameters, aspects of implementation, and milestones of construction will be shown, including ERL efficiency of 99.4% in a 1-turn ERL arrangement and simultaneous orbits of 7 beams in one beam-transport system during 4-turn ERL operation.

Speaker: Yujiro Yonemura

Abstract: The accelerator facility, which consists of the 8-MV tandem accelerator and the 150-MeV FFA accelerator, has been constructed in Center for Accelerator and Beam Applied Science of Kyushu University. In this presentation, the present status of the FFA are reported.

Speaker: JB Lagrange

Abstract: A scaling VFFA prototype ring is planned at Rutherford Laboratory in the UK. A scaling VFFA magnet must follow an exponential law for both the vertical component and longitudinal component of the magnetic field in the median plane. Discussion on the design will be presented in this talk.

Speaker: Tomonori Uesugi, KURNS

Abstract: Because of a fire accident happened at KURNS FFAG last January, the orbit corrector magnets beside the rf cavity were burned. This talk reports how the accident happened, and the damage of the magnets and other parts of the cavity.

Speaker: Yoshihiro Ishi

Abstract: The recent status of the FFA accelerator complex at KURNS will be reported. Experimental plans using proton beams from the main ring will be also presented.