The K1.8BR spectrometer system at J-PARC

A new spectrometer system has been designed and constructed at the secondary beam line K1.8BR in the hadron hall of J-PARC to investigate K N interactions and K -nuclear bound systems.The spectrometer consists of a high precision beam line spectrometer, a liquid 3 He/ 4 He/D 2 target system, a cylindrical detector system that surrounds the target to detect the decay particles from the target region, and a neutron time-of-flight counter array located ∼15 m downstream of the target position.Details of the design, construction, and performance of the detector components are described.. . . . . . . .