Beam and SKS spectrometers at the K1.8 beam line

Abstract

High-resolution spectrometers for both incident beams and scattered particles have been con- structed at the K1.8 beam line of the Hadron Experimental Facility at J-PARC. A point-to-point optics is realized between the entrance and exit ofQQDQQ magnets for the beam spectrometer. Fine-pitch wire chamber trackers and hodoscope counters are installed in the beam spectrometer to accept a high rate beam up to 107 Hz. The superconducting kaon spectrometer for scattered particles was transferred from KEK with modifications to the cryogenic system and detectors. (π±, K+) reactions on a proton target in the first physics run ofE19 in 2010.