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- W4285195325 abstract "Abstract In the low-energy region of a high-intensity ion linac, a strong space-charge field causes a rapid beam emittance growth over a short distance of only a few meters. The beam emittance growth leads to beam loss and machine activation, raising a serious issue for regular maintenance of the accelerator component and beam power ramp-up. We studied the mechanism of beam emittance growth due to the space-charge field based on three-dimensional particle-tracking simulation and theoretical considerations. Numerical simulations of the high-intensity H− (negative hydrogen) linac at the Japan Proton Accelerator Research Complex shows that the nonlinear terms in the space-charge field directly cause beam emittance growth and beam halo formation. We also propose a method to mitigate the beam emittance growth by using an octupole magnetic field, which arises as one of the nonlinear terms in the space-charge field. By applying this method in the simulation we have succeeded in mitigating the beam emittance growth." @default.
- W4285195325 created "2022-07-14" @default.
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- W4285195325 date "2022-05-11" @default.
- W4285195325 modified "2023-10-14" @default.
- W4285195325 title "Beam emittance growth due to the strong space-charge field at low energy of a high-intensity ion linac and its mitigation using an octupole magnetic field" @default.
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- W4285195325 doi "https://doi.org/10.1093/ptep/ptac077" @default.
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