Characteristics of cylindrical ion trap

The characteristics of cylindrical ion trap (CIT) for a miniaturized mass spectrometer was investigated. The equation of motion for an ion was derived, and the stability region in the CIT was calculated and compared with that in the Paul trap. As the result, the geometric relation between the CIT and the Paul trap was obtained analytically, which is useful to easily analyze the stability of ion motion in the CIT. Through the pseudo-potential approach, the stability space in the CIT was discussed qualitatively. The stability space which indicated the stability of ion motion in space was quantitatively calculated by the equation of motion and analyzed. It was reconfirmed that the stability space was dependent on the position of ion, differently from the Paul trap.