Space charge and collective oscillation of ion cloud in a linear Paul trap

TL;DR

This paper investigates how space charge effects influence the collective oscillation and frequency shifts of ions in a linear Paul trap, combining experimental observations with minimal-parameter modeling.

Contribution

It presents a combined experimental and theoretical study of space charge effects on ion dynamics in a linear Paul trap, highlighting the critical role of space charge in collective oscillation onset.

Findings

Space charge causes measurable shifts in secular frequency.

Collective oscillations are observed under specific trapping conditions.

Modeling aligns well with experimental data using minimal parameters.

Abstract

The presence of charged particles in an ion trap modifies the harmonic trapping potential in which they are trapped, leading to observed shifts in secular frequency as well as appearance of collective oscillation. In a linear trap geometry, both of these effects have been observed under different trapping conditions using narrow non-linear resonance and external excitation. The observations have been modeled with minimal fitting parameter showing good agreement with results obtained. The space charge in our experiment plays an important role in terms of criticality of the onset of collective oscillation.