Abstract
The transverse compression of a long charge bunch is investigated in the Paul trap simulator experiment (PTSX), which is a linear Paul trap that simulates the nonlinear transverse dynamics of an intense charged particle beam propagating through an equivalent kilometers-long magnetic alternating-gradient (AG) focusing system. Changing the voltage amplitude at fixed focusing frequency in the PTSX device corresponds to changing the field gradient of the quadrupole magnets with fixed axial periodicity in the AG transport system. In this work, we present experimental results on transverse compression of the charge bunch in which the amplitude of the applied oscillatory focusing voltage is changed instantaneously, and adiabatically. The experimental data are also compared with analytical estimates and 2D WARP particle-in-cell simulations.
Highlights
Applications of present- and next-generation highintensity accelerators [1,2,3,4] to high energy and nuclear physics, high energy density physics, and heavy ion fusion often require transverse and longitudinal compression of the charge bunch to a small spot size at the target location [5,6]
The initial charge bunch for the compression experiments is trapped in the Paul trap simulator experiment (PTSX) device with a sinusoidal voltage waveform with f 60 kHz and V0 max
Experimental studies of the transverse compression of a long charge bunch have been performed in the Paul trap simulator experiment (PTSX)
Summary
Applications of present- and next-generation highintensity accelerators [1,2,3,4] to high energy and nuclear physics, high energy density physics, and heavy ion fusion often require transverse and longitudinal compression of the charge bunch to a small spot size at the target location [5,6]. The transverse compression can be achieved by means of increasing the focusing strength of the alternating-gradient (AG) lattice along the beam propagation direction [5]. The amplitude and frequency of the voltage waveform applied to the electrodes of the PTSX device correspond to the focusing strength and lattice spacing in an AG system, respectively. In this study, we present experimental results describing the transverse compression of an intense beam pulse by compressing a long nonneutral ion charge bunch trapped in the PTSX device. The trap confines nonneutral ion plasmas in the transverse direction by applying an oscillating voltage V0 t with frequency f to the four sectors of the central electrode, creating a ponderomotive force that is. The short electrodes on the source end are made to oscillate with the same voltage waveform as the central electrodes. 109 Torr and 1 105 cm , respectively, and the plasma is collisionless to very good approximation
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