We propose a new ion trap, the rotating-rf trap, in which motion of a charged particle is described not by Mathieu-type functions but by trigonometric functions. In the rotating-rf trap, a quadrupole electric field confines charged particles, whereas in a normal rf trap, an oscillating quadrupole field does. Ion motion in a rotating-rf trap is a superposition of two non-degenerate circular motions and two corresponding circular micromotions. The cases of applying a uniform magnetic field and a quadrupole dc electric field in addition to the rotating rf field are also discussed. Confinement in a rotating field can be tighter than in a normal linear rf trap with the same experimental parameter values.
Physical Review A (Atomic, Molecular and Optical Physics)
and Bollinger, J.
Rotating-radio-frequency ion traps, Physical Review A (Atomic, Molecular and Optical Physics), [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50171
(Accessed November 30, 2023)