A new multi-turn beam dump scheme design and simulation for HIAF-BRing machine protection

Purpose: To protect accelerator devices from being damaged by high-power beam, a new beam dump system is under design for HIAF-BRing. Method: Based on the optical characteristics, unwanted particles are safely deflected to a specific internal absorber through a local bump orbit generated by active-discharging magnets, which is achieved by paralleling a bleeder resistor of 600 m<inline-formula id="IEq1"><alternatives><math><mi mathvariant="normal">Ω</mi></math><tex-math id="IEq1_TeX">\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Omega $$\end{document}</tex-math><inline-graphic href="41605_2022_353_Article_IEq1.gif"></inline-graphic></alternatives></inline-formula>to two of dipole magnet power supplies. Results: Taking alignment and multipole field errors into account, discarded beam can be dumped within 5 ms with an efficiency of more than 99.8% at any operation stage. Conclusion: The proposed beam dump solution satisfies the machine protection requirements for BRing and can provide a new idea for similar facilities.