Abstract
The Paul Trap Simulator Experiment (PTSX) is a linear Paul trap whose purpose is to simulate the nonlinear transverse dynamics of intense charged particle beam propagation in periodic-focusing quadrupole magnetic transport systems. Externally created cesium ions are injected and trapped in the long central electrodes of the PTSX device. In order to have well-matched one-component plasma equilibria for various beam physics experiments, it is important to optimize the ion injection. From the experimental studies reported in this paper, it is found that the injection process can be optimized by minimizing the beam mismatch between the source and the focusing lattice, and by minimizing the number of particles present in the vicinity of the injection electrodes when the injection electrodes are switched from the fully oscillating voltage waveform to their static trapping voltage.
Highlights
A fundamental understanding of intense beam propagation over long equivalent distances is important for the design and operation of modern high-intensity linear accelerators and beam transport lines [1,2]
Davidson et al [3] and Okamoto et al [4] proposed a compact linear Paul trap configuration to study intense beam propagation by showing that, for certain operating conditions, the transverse dynamics of a one-component plasma trapped in the linear Paul trap is fully equivalent to that of an intense beam propagating through a periodicfocusing quadrupole magnetic field configuration
The Paul Trap Simulator Experiment (PTSX) device is a long linear Paul trap with cylindrical electrodes (Fig. 1) that can simulate the collective processes and nonlinear transverse dynamics of an intense beam propagating through a quadrupole lattice in a compact and flexible laboratory setup
Summary
A fundamental understanding of intense beam propagation over long equivalent distances is important for the design and operation of modern high-intensity linear accelerators and beam transport lines [1,2]. Davidson et al [3] and Okamoto et al [4] proposed a compact linear Paul trap configuration to study intense beam propagation by showing that, for certain operating conditions, the transverse dynamics of a one-component plasma trapped in the linear Paul trap is fully equivalent to that of an intense beam propagating through a periodicfocusing quadrupole magnetic field configuration. This idea has been applied to crystalline beams in storage rings by Kjærgaard et al [5]. The typical operating pressure and ion number density in PTSX are 5 10ÿ9 Torr and 1 105 cmÿ, respectively, and the plasma is collisionless to very good approximation
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