兰州重离子加速器储存环引出切割磁铁电源数字化升级
Digitalizing Upgrade of the Power Supplies for the Extraction Septum Magnets in HIRFL-CSR
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摘要: 介绍了兰州重离子加速器储存环(HIRFL-CSR) 引出切割磁铁电源的工作原理及进行数字化升级方案。采用了基于FPGA(Field Programmable Gate Array) 的可编程片上系统(SOPC)、NIOSII 的软件架构及硬件描述语言编写的多环调节算法，探讨了在FPGA 上实现加速器电源控制算法的一些关键问题。对引出切割磁铁电源进行数字化升级后，HIRFL-CSR的主环束流引出过程更加可靠，同时提高了实验终端束斑位置的稳定性。本工作为HIRFL-CSR 磁铁电源的全面数字化及重离子治癌数字电源的研发提供了重要的技术参考。This paper introduces the working principle of the power supplies for the septum magnets in HIRFL-CSR and presents a feasible scheme of digitalizing these power supplies. The scheme employed the SOPC (system-on-a-programmable-chip) technology based on FPGA, the software framework of NIOSII and the polycyclic adjustment algorithm realized by the hardware description language. Then, several key problems that could be encountered in realizing the power supply control algorithm on FPGA were discussed. After the power supplies were upgraded, the beam of HIRFL-CSR was extracted more reliably and the stability of beam spot position at the experimental terminals has been obviously improved. This work would provide a valuable reference for the engineers of digitalizing other magnetic power supplies in HIRFL-CSR and of developing magnetic power supplies for heavy ion cancer therapy.Abstract: This paper introduces the working principle of the power supplies for the septum magnets in HIRFL-CSR and presents a feasible scheme of digitalizing these power supplies. The scheme employed the SOPC (system-on-a-programmable-chip) technology based on FPGA, the software framework of NIOSII and the polycyclic adjustment algorithm realized by the hardware description language. Then, several key problems that could be encountered in realizing the power supply control algorithm on FPGA were discussed. After the power supplies were upgraded, the beam of HIRFL-CSR was extracted more reliably and the stability of beam spot position at the experimental terminals has been obviously improved. This work would provide a valuable reference for the engineers of digitalizing other magnetic power supplies in HIRFL-CSR and of developing magnetic power supplies for heavy ion cancer therapy.
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