Studies Of The Machine Protection Of The Booster Ring At High Intensity Heavy-ion Accelerator

Beam loss studies in accelators are one of the most important topics,which determine both the upper and lower limits of the machine performance.According to the time scale and severity of beam losses,it can be classified into three categories,singleturn loss,multi-turn loss,and slow loss.For HIAF-BRing,failures of the magnet power supply will result in one of the most severe beam losses,which is essential to evaluate its impact.In this thesis,a magnet failure model for BRing is developed and an element-byelement beam dynamics simulation software BTracker is developed,which has obvious advantages in performance and usability due to extensive algorithm optimization.A detailed simulation of the beam loss due to magnet power supply failure of BRing is carried out,and the general characteristics of such losses are summarized and explained,and finally,feasible protection measures are proposed.The HIAF facility faces a risk of damage to the accellerator elements by high power beam losses during operation.In order to protect the accellerator elements from severe beam losses,to stop possible severe beam losses,to mitigate the effects of uncontrollable beam losses and reduce the secondary radiation effects,to increase the safety of the machine,to improve the efficiency of the machine operation,and to save labor,resources and machine maintenance costs,a machine protection system is currently being designed and built.This system will monitor the status of the machine and the beam in real time and perform certain active measures to protect the machine when necessary.BRing,the booster and core accellerator of the HIAF facility,has a very complex operating mode and beam state.In order to prevent damage to the accellerator from uncontrolled high power beams after the failure of its critical equipment,BRing has an urgent requirement to develop a beam dump system.The system is intended to quickly and safely transfer the high-powered beam from the ring to a pre-designed beam absorber.For BRing,there are significant limitations in efficiency,technical feasibility,and cost for the beam dump scheme currently adopted in similar facilities around the world.In this work,a beam dump scheme driven by dipole magnets is proposed for the first time,and a detailed numerical simulation of the beam dump process is carried out via BTracker and FLUKA software.The simulation results have validated the high feasibility and reliability,and suggest a feasible requirement range for the relevant equipment parameters.Not only does the scheme meet the demand of BRing machine protection,but also provide a new idea and consideration for similar devices in the world.