Speaker
Description
Recent hadron linacs, such as the IFMIF accelerator [1], aim to achieve an average beam current beyond 100 mA. In addition, a single-cell cavity linac for nuclear waste transmutation [2], which just started its development, is expected to deliver continuously a D+ beam of 1 A. In such high-intensity beam linacs, even sub-percent levels of beam losses can lead to significant activation. Therefore, highly accurate studies of beam halo dynamics are necessary to evaluate the losses with accuracy two orders of magnitude greater than existing evaluations. For this purpose, the methodology and simulation framework should be reconsidered to ensure required accuracy of the particle tracking. In this study, we focus on longitudinal momentum halos formed as fractional velocity particles. The discrete dynamical model of a simplified drift tube linac has demonstrated stable capture of these particles by fractional velocity radio-frequency buckets and their continuous acceleration. Furthermore, analysis of the stability conditions of periodic focusing channels has suggested that these halos can survive even in the downstream region. Eventually, we provide a fundamental discussion [3] on acceleration and transport of halo particles that naturally arise in high intensity linacs.
[1] I. Podadera et al., Nucl. Fusion 65 122011 (2025).
[2] H. Okuno, et. al., Proc. Jpn. Acad. Ser B 95, 430 (2019).
[3] submitted to Phys, Rev. A&B (2025).
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