Objective This paper aims to reveal the confinement characteristics and loss mechanisms of positrons in a suspended dipole magnetic field, present an optimized method based on rotating electrode technology to achieve long-term and stable positron confinement.
Method Test particle simulation was used to analyze the trajectory and loss mechanisms of positrons in a suspended dipole magnetic field. The rotating electrode technology was introduced by arranging eight arc-shaped electrodes around the vacuum chamber. A controllable toroidal electric field was generated by dynamically adjusting the phase difference between adjacent or nonadjacent electrodes and the electrode rotation frequency, driving positrons to undergo E×B drift inward.
Result The method allows the positron drift toward the strong magnetic field region, reducing collisions with the incident window structure, thereby significantly improving the positron confinement time.
Conclusion Rotating electrode technology enhances positron confinement by tuning the E×B drift, offering a new approach for efficient antimatter ion transport and long-term confinement. This method is applicable to electron-positron plasma confinement studies, which is of enlightening significance for improving the confinement time of antimatter.
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