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摘要:
武威和兰州重离子加速器使用回旋加速器作为其注入器。回旋加速器为该装置的同步加速器提供10 µA的碳离子束流以满足其物理需求。而径向探针则是安装在回旋加速器内部实现束流流强和圈图测量的重要束诊元件。径向靶头上的束流信息经前端电子学拾取后会进一步进入数据采集系统,最终实现回旋加速器的束流流强和圈图测试。其中,径向探针的前端电子学采用皮安表,数据采集系统基于实时操作系统和FPGA技术。介绍了径向探针的机械结构设计,并分析了探头有无水冷结构的热结构;描述了控制系统软硬件架构,可以实现10 kHz的数据和位置信息的同步采集。最后,还介绍了探针机械和控制系统的实验室测试和验收标准以及在束测量结果。
Abstract:The cyclotron is designed as the injector of the Heavy Ion Medical Machines (HIMMs) in Wuwei city and Lanzhou city, China. It provides 10 µA carbon ion beams to fulfill the accumulation requirement in the following synchrotron. Four picoammeters acquire the beam current signals gathered by the radial detectors; meanwhile, the beam time structure is measured with Field Programmable Gate Arrays and a real-time operating system. This paper introduces the mechanical design of the radial detectors and further provides the thermal structure analysis result of probe tips with and without water cooling. Moreover, the hardware and software architecture of the control system for this detector is described, including the motion control and data acquisition system, which can implement simultaneous acquisition of beam current data and position at more than 10 kS/s. At last, the laboratory test and acceptance scheme of both mechanical and control systems are listed, and the beam current and turn pattern measurement results at HIMMs are presented in this paper.
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Key words:
- HIMM /
- cyclotron /
- radial detector /
- modularity /
- OPC UA
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Table 1. Size of the integral and differential target tips
tip No. tip name size/mm 1 integral tip 40 2 differential tip−top 12 3 differential tip−middle 12 4 differential tip−bottom 12 -
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