Penning Trap Question: Causes of Axial Oscillation

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The axial oscillation of a charged object in a Penning trap is primarily caused by the electric potential created by the end caps. Although the end caps have a zero potential difference between them, the charged ion experiences a restoring force that leads to oscillation. This oscillation occurs as the ion is attracted to one end cap and then the other, creating a back-and-forth motion. The dynamics of this process are influenced by the specific geometry and configuration of the trap. Understanding these principles is essential for applications in fields like ion trapping and quantum computing.
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Hi I realize that this is probably not going to be a well known topic. However does anyone know what actually causes the axial oscillation of a charged object (ion) in a Penning trap. I know that it is a result of the potential at the end caps. But the 2 end caps have a zero potential between them. Why does it oscillate ? Is it because it is getting attracted to one end cap then the other, which creates an oscillation?
 
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