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首页> 外文期刊>Physics of plasmas >Excitation of transverse dipole and quadrupole modes in a pure ion plasma in a linear Paul trap to study collective processes in intense beams
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Excitation of transverse dipole and quadrupole modes in a pure ion plasma in a linear Paul trap to study collective processes in intense beams

机译：激发线性Paul阱中纯离子等离子体中的横向偶极子和四极子模式，以研究强束中的集体过程

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Transverse dipole and quadrupole modes have been excited in a one-component cesium ion plasma trapped in the Paul Trap Simulator Experiment (PTSX) in order to characterize their properties and understand the effect of their excitation on equivalent long-distance beam propagation. The PTSX device is a compact laboratory Paul trap that simulates the transverse dynamics of a long, intense charge bunch propagating through an alternating-gradient transport system by putting the physicist in the beam's frame of reference. A pair of arbitrary function generators was used to apply trapping voltage waveform perturbations with a range of frequencies and, by changing which electrodes were driven with the perturbation, with either a dipole or quadrupole spatial structure. The results presented in this paper explore the dependence of the perturbation voltage's effect on the perturbation duration and amplitude. Perturbations were also applied that simulate the effect of random lattice errors that exist in an accelerator with quadrupole magnets that are misaligned or have variance in their field strength. The experimental results quantify the growth in the equivalent transverse beam emittance that occurs due to the applied noise and demonstrate that the random lattice errors interact with the trapped plasma through the plasma's internal collective modes. Coherent periodic perturbations were applied to simulate the effects of magnet errors in circular machines such as storage rings. The trapped one component plasma is strongly affected when the perturbation frequency is commensurate with a plasma mode frequency. The experimental results, which help to understand the physics of quiescent intense beam propagation over large distances, are compared with analytic models.
机译：在Paul Trap模拟器实验（PTSX）中捕获的单组分铯离子等离子体中激发了横向偶极和四极模式，以表征它们的特性并了解其激发对等效长距离光束传播的影响。 PTSX设备是一种紧凑的实验室Paul阱，可通过将物理学家置于光束的参考系中来模拟通过交替梯度传输系统传播的长而密集的电荷束的横向动力学。一对任意函数发生器用于施加具有一定频率范围的陷波电压波形扰动，并通过改变具有扰动的电极来改变偶极或四极空间结构。本文提出的结果探讨了扰动电压的影响对扰动持续时间和幅度的依赖性。还应用了摄动来模拟随机加速器中存在的随机晶格误差的影响，该加速器中的四极磁体未对准或场强存在变化。实验结果量化了由于施加的噪声而引起的等效横梁发射率的增长，并证明随机晶格误差通过等离子体的内部集体模式与捕获的等离子体相互作用。运用相干周期性摄动来模拟圆形机械（例如存储环）中磁体误差的影响。当扰动频率与等离子模式频率相对应时，会严重影响捕获的一种成分的等离子。将实验结果与解析模型进行了比较，有助于理解大距离静态强光束的传播机理。

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