  A radiofrequency quadrupole ion trap system for use with a multi-reflection
time-of-flight mass spectrograph (MRTOF) for short-lived nuclei has been
developed. The trap system consists of two different parts, an asymmetric taper
trap and a flat trap. The ions are cooled to a sufficient small bunch for
precise mass measurement with MRTOF in only 2 ms cooling time in the flat trap,
then orthogonally ejected to the MRTOF for mass analysis. A trapping efficiency
of ~27% for 23Na+ and ~5.1% for 7Li+ has been achieved.
