医用回旋加速器工作状态下束流稳定性分析

Analysis about Cyclotron Beam Stability under Working Conditions

目的分析医用回旋加速器两种工作状态下加速束流的基本特征;监测加速器在较高负荷运行条件下的束流稳定性。方法利用高纯氢气作为离子源气体,分别自加速末端提取单、双束流,测试两种条件下离子源电流、引出束流及加速环境的真空度随时间的变化趋势。结果真空腔的真空度、离子源电流及准直器电流在双束流测试时变化幅度相对较大,两种测试条件下,真空度及离子源呈缓慢递增趋势,准直器电流呈缓慢递减趋势,60min后趋于稳定。结论正常工作状态下,单束流比双束流轰靶的束流稳定性强,且两种条件下束流最终处于较稳定的工作状态。应优先选择单束流工作模式。

Objective To analyze the working conditions of medical cyclotron to accelerate the two basic characteristics of the beam and to monitoring accelerator at a high load operating conditions of beam stability.Methods Using high purity hydrogen as the ion source gas,respectively,extracted from the odd and even accelerate the end of the beam,testing the ion source current under two conditions,beam extraction and acceleration of the vacuum environment,get the trend over time.Results The vacuum chamber of the vacuum,the ion source current and collimators in dual beam test current amplitude are relatively larger,the two test conditions,the vacuum and was slowly increasing trend in the ion source,collimator current was slowly decreasing trend 60 minutes to stabilize.Conclusion normal operation,the beam stability of the single beam is better than the dual-beam in bombing target,and the final two conditions of work in a more stable state;give priority to single-beam mode.