Measurement of spatial resolution of 11 MeV proton radiography

Proton radiography experiment with a Zumbro lens system was carried out on an 11 MeV proton cyclotron.The experimental results show that the image blurring is improved markedly. Clear images and good spatial resolution of the density step edges are obtained, which is important for hydrotest experiments, and the spatial resolution can achieve ~100 μm.     

医用回旋加速器控制系统设计

医用回旋加速器目前广泛应用于国防基础科学研究、同位素生产以及诊断、治疗等应用领域,然而都无一例外地要求其稳定性、安全性。本文从医用回旋加速器的应用需求出发,概述了控制系统的组成、各子系统的作用,详细阐述了以RX3i可编程控制器为前端控制器的系统集成、高频系统的低电平控制的控制策略以及不同工作模式下各系统间的安全联锁。连续的运行结果表明：控制系统保证了整个系统的平稳运行,满足了加速器运行及其调试要求。     

Imaging principle and experiment results of an 11 MeV low-energy proton radiography system

Differing from radiography without lens system, the high-energy proton radiography(PRAD) uses Zumbro lens system to focus the penetrating protons. Since the Zumbro lens system is able to limit the range of multiple Coulomb scattering angles of the protons, the low-energy PRAD with Zumbro lens system is also feasible,although the attenuation of probing protons in the object is negligible. Low-energy PRAD is superior to the high-energy PRAD for diagnosing the objects of small thicknesses. To verify the imaging principle of Zumbro lens system, 11 MeV PRAD experiments were performed at the China Academy of Engineering Physics(CAEP)recently. The experiment results demonstrated that this 11 MeV PRAD was able to radiograph objects of area density less than 2.7 × 10-2 g/cm2 and the area density discrepancy less than 2.3% could be distinguished.     

医用回旋加速器高频控制系统设计

中国工程物理研究院流体物理研究所自主研制了用于医疗诊断的PET医用回旋加速器。为满足该医用回旋加速器安全、稳定运行的要求,采用了不带低电平控制功能的高频系统,避免了直接接触高压的危险。选用西门子的S7-1500可编程控制器为前端控制器,完成了系统工作频率的精确扫描,实现了高频系统相位稳定、幅度稳定、安全联锁等。该系统连续运行的结果表明：控制系统的设计满足加速器运行及调试要求,为系统的稳定运行提供了支撑。     

模拟离子源注入型IH加速器研制进展

离子源注入型交叉手指型横电模(IH)加速器有望发展成为一种紧凑的、低功耗的离子加速器.中国工程物理研究院流体物理研究所研制了一台将质子束从0.04 MeV加速到2.0 MeV的离子源注入型IH加速器,目前已经完成了该加速器的设计加工和束测平台搭建,并进行了初步的束流测试试验.实测束流传输效率为32.77％.束流实验结果...