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Design Study of a Multipole Ion Trap for Beam Physics Applications

机译：用于束流物理的多极离子阱的设计研究

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A unique linear Paul trap is designed for a systematic experimental study of nonlinear beam dynamics with the tabletop apparatus “S-POD” at Hiroshima University. S-POD is the abbreviation of “Simulator of Particle Orbit Dynamics” where we can produce a non-neutral plasma physically equivalent to a charged-particle beam in an alternating-gradient focusing channel. Unlike a regular Paul trap with four quadrupole rods, the present trap configuration includes extra electrodes that enable us to control the strengths and time structures of low-order nonlinear fields independently of the linear focusing potential. We here consider the insertion of thin metallic plates in between the quadrupole rods. The size and arrangement of those extra electrodes are optimized by using a Poisson solver. Simple scaling laws are derived to make a quick estimate of the sextupole and octupole field strengths as a function of the plate dimension. Particle tracking simulations are performed to demonstrate the controlled excitation of nonlinear resonances in the modified Paul trap.
机译：广岛大学的台式仪器“ S-POD”设计了一种独特的线性Paul阱，用于非线性束动力学的系统实验研究。 S-POD是“粒子轨道动力学仿真器”的缩写，在交替梯度聚焦通道中，我们可以在物理上等效于带电粒子束的非中性等离子体。与具有四个四极杆的常规Paul陷阱不同，当前的陷阱配置包括额外的电极，这些电极使我们能够独立于线性聚焦电势来控制低阶非线性场的强度和时间结构。我们在这里考虑在四极杆之间插入金属薄板。通过使用泊松求解器可以优化那些额外电极的尺寸和布置。推导出简单的定标定律，以快速估计六极和八极场强随板尺寸的变化。进行粒子跟踪模拟以证明改进的Paul阱中非线性共振的受控激发。

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