Abstract
A random noise-induced beam degradation that could affect intense beam transport over long propagation distances has been experimentally investigated by making use of the transverse beam dynamics equivalence between an alternating-gradient focusing system and a linear Paul trap system. For the present study, machine imperfections in the quadrupole focusing lattice are considered, which are emulated by adding small random noise on the voltage waveform of the quadrupole electrodes in the Paul trap. It is observed that externally driven noise continuously increases the rms radius, transverse emittance, and nonthermal tail of the trapped charge bunch almost linearly with the duration of the noise. The combined effects of collective modes and colored noise are also investigated and compared with numerical simulations.
Highlights
High-intensity accelerators have a wide range of applications ranging from basic scientific research in high energy and nuclear physics, to applications such as heavy ion fusion, ion-beam-driven high energy density physics, tritium production, nuclear waste transmutation, and spallation neutron sources for material and biological research [1,2,3]
We have presented experimental verification of the random noise-induced beam degradation theoretically expected in high-intensity accelerators
This was possible because the Paul trap simulator experiment (PTSX) device is a compact experimental setup with flexible control over the external focusing fields that can simulate the nonlinear transverse dynamics of an intense beam propagating through an actual AG focusing system
Summary
High-intensity accelerators have a wide range of applications ranging from basic scientific research in high energy and nuclear physics, to applications such as heavy ion fusion, ion-beam-driven high energy density physics, tritium production, nuclear waste transmutation, and spallation neutron sources for material and biological research [1,2,3]. In intense beams, the action of the nonlinear space-charge force plays a critical role in transforming random noise effects into emittance growth [8]. 20 km-long beam propagation distances [15] for an equivalent AG system with 1-m magnet spacing, effects of the quadrupole focusing gradient errors in SNS-like highintensity accelerators can be effectively studied.
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