The ion-optics design of KOBRA

KOBRA (KOrea Broad acceptance Recoil spectrometer and Apparatus) is a mass separator that is being designed for experiments to study nuclear astrophysics, nuclear spectroscopy, symmetry energy and spin polarization with low energy stable/RI beams up to ∼20 MeV/nucleon at RAON. KOBRA is divided into two-stage configurations consisting of in-flight separator and recoil spectrometer. The first stage as an in-flight separator consists of double achromatic separator and short length Wien filter. The second stage consists of rotatable QQD-type spectrometer with long length Wien filter. KOBRA has been designed to enable reaction experiments using the RI beams which are produced by not only transfer reactions but also quasi-projectile fragmentation. (author)