We present a theoretical basis and simple experimental realization of a multipole radio-frequency trap consisting of four equal cylindrical electrodes, where all of the bars have an in-phase applied voltage. An effective potential, which describes three additional stable quasi-equilibrium points, is obtained, and an electrostatic distribution is calculated using the method of image charges. We construct an experimental setup and localize a group of charged silicate microspheres at normal pressure. The experimental results agree well with the proposed analytical model. A strong dependence on modulation of the radio-frequency field and effective potential is confirmed.

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In the present article, we discuss an electrostatic field around four-bar trap, where in-phase AC voltage is applied to all electrodes. We consider shielding effect on trap’s field distribution. The ideal octupole field is obtained using a cylindrical grounded surface. Single-phase trap gives an opportunity to form an n-order multipole field within n + 1 number of electrodes. This approach reduces the number of electrodes in comparison with the classical case.

In the present work a formation of extended orbits of single charged particles in a linear radiofrequency trap under the action of the light pressure force of laser radiation is considered. The conditions for the formation of extended orbits depending on the characteristics of the laser radiation and the object of localization are determined. Keywords: ion traps, quadrupole traps, light pressure, extended orbits, period-doubling bifurcation, nonlinear dynamics.