The SHARAQ spectrometer

The SHARAQ spectrometer and a high-resolution beam-line have been constructed at the RI Beam Factory at RIKEN. They are designed to achieve a momentum resolution of delta p/p = 1/14 700 and an angular resolution of 1 mrad. Low-pressure multi-wire drift chambers working at a high rate of 2 MHz and cathode read-out drift chambers have been developed as beam-line tracking detectors and focal plane detectors, respectively. A method that facilitates quick tuning of the RI beam transport has been established. The SHARAQ spectrometer and the beam-line were commissioned in 2009 and put into use in several experimental programs that exploits advantages of RI-beam induced charge exchange reactions.