By increasing the intensity of the charged particle beam output from an accelerator, its operational efficiency can be enhanced across a wider range of applications. This improved efficiency can enable the discovery of physical phenomena requiring extensive datasets. However, producing such a high-intensity beam requires it to be transported while minimizing the dispersion (emittance) of its constituent particles and suppressing radiation emitted by unintended particle collisions with accelerator equipment. This study employed simulations and theoretical analyses to investigate the increase in the emittance caused by electrical interactions between particles in the low-energy region of a high-intensity linear ion accelerator. A methodology to mitigate this increase in the emittance was also devised.

In conventional accelerators, the beam is focused and transported using a quadrupole magnetic field. This study demonstrates that adding an octupole magnetic field to the quadrupole field can effectively reduce the emittance (Fig. 1). This approach is hypothesized to lower unwanted radiation, enabling the accelerator to produce highly intense and stable beams.

This work was supported by JST SPRING, Japan Grant Number JPMJSP2114.

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