应用于强流重离子加速器装置增强环(HIAF-BRing)的快循环全储能脉冲电源需要在极宽的输出电压范围内保持极高的控制精度,为此电源采用了高压功率单元和低压功率单元串联的拓扑方式,在低压段采用低压功率单元,电压升高之后切换到高压功率单元,通过高低压切换控制来实现电流全阶段的高精度输出.但是在样机实测中发现存在切换点的振荡问题,导致切换点处的输出电流绝对误差无法满足指标要求.本文提出了一种切换点平滑控制算法来平滑处理切换点占空比,给出了仿真结果,并且在HIAF-BRing快循环全储能脉冲电源样机上面实际验证了高低压切换控制方法及其切换点平滑控制算法的有效性.实验结果表明:100?A注入平台的输出电流绝对误差由±500?mA降至±50?mA,100?A注入平台的切换点处输出电流绝对误差由±1.16?A降至±120?mA,100?A注入平台输出精度较低的问题得以解决.

Stable magnetic field is crucial for the precision experiments conducted at the heavy ion storage rings. Besides the current stability of the power supply, the magnetic field is also influenced by varying ambient factors such as temperatures. This paper proposed a dual-loop hysteresis control method to passively change the output current of the power supply according to the magnetic field monitored by the nuclear magnetic resonance (NMR) probes. As a result, the long-term relative changes of magnetic field were reduced from dB/B approximate to 5.75 x 10-5 to 2.3 x 10-5 within three days.

近年来,离子治疗技术在国内外发展迅速.为满足加速器调试和不同治疗方案对医用回旋加速器装置的不同束流能量要求,二极磁铁电源要求工作在可相互切换的直流、有序触发和周期脉冲三种模式.使用中国科学院近代物理研究所自主研发的集成盒装式控制器,实现了对电源的控制和保护功能.为了适应调试和治疗两种不同场合的需求,控制器还支持本地和远程控制两种不同的网络协议,可通过触摸屏的控制按钮完成两者的切换.电源主回路和控制器设计并装配完成后,对各项指标进行了测试.测试结果表明,电源可正常工作在不同模式下,额定电流下长期稳定度达到了21×10-6,电流纹波小于万分之四,超出了设计指标.

Power supply prototype in High Intensity heavy ion Accelerator Facility-Booster Ring (HIAF-BRing) adopts the scheme of full energy and fast cycle storage pulse power supply topology. Its multi modules are connected in series and parallel pattern, and the power reaches megawatt level. Due to the high power and large scale of the power supply, a module fault interlock protection system based on Programmable Logic Controller (PLC), interlock boards and Field Programmable Gate Array (FPGA) is designed and implemented to protect the power supply in operation. In this paper, first, a design of double redundant module fault interlock is introduced. Second, the logic implemented in PLC is described. Third, the work about FPGA is given. Finally, the system is tested in three aspects: the responsive time of the power supply interlock loop, the total time from controller error occurrence to interlock finish, and the equipment fault response. The result shows that the module fault interlock system can action sensitively, timely and reliably in case of fault occurrence, which meets the requirements of the power supply prototype in HIAF-BRing.

为达到接收机中550 GHz混频器前端本振源的输出功率,对核心器件倍频器进行了研究.采用固态电子器件的方式设计并实现了275 GHz非平衡式三倍频器.通过建立理想倍频器电路模型,分析了肖特基二极管管芯参数对整体倍频器性能的影响,并对电路中等效电容、电感值及输入输出匹配端阻抗和相位进行了优化设计,以提升带外抑制特性和倍频效率.实测结果表明,该三倍频器在270～280 GHz工作频带内倍频效率最大值为10.75％,输出功率大于5 mW;当驱动功率为23 dBm时,最大输出功率为12.6 mW,满足驱动后级混频器工作的功率需求.

To solve the problem of huge amount of remote sensing satellite image data and complex calculation in systematically geometric correction,a multi-level parallel algorithm based on SMP cluster was proposed.Adopting the MPI and OpenMP hybrid programming model,the systematically geometric correction algorithm was implemented in coarse-grained parallelism manner between nodes and fine-grained parallelism manner within nodes.The data was divided based on the redundant storage,which ensured the load balancing and reduced the complexity of the data positioning;distributing data on parallel file system avoided data transit between nodes and enabled data reading and writing in parallel;parallel algorithm was implemented in intra-node,which further fined the parallel granularity.Finally we tested this multi-level parallel algorithm with the NAD image of Ziyuan-3(ZY-3)satellite.Results show that this multi-level parallel algorithm makes full use of computing resources of SMP cluster and improves the efficiency of systematically geometric correction greatly.

Versatility and scalability of systematically geometric correction is still a challenging problem in remote sensing satellite ground processing system.Based on design patterns,this paper proposes the design and implementation of geometric correction algorithm.Through using the template method and factory method of design patterns,the difference in the systematically geometric corrected process of different satellites and sensors is solved.To solve the disunified auxiliary data format,the output format of auxiliary data is specified;using template method design pattern,we abstract the general process and set up the outline of systematically geometric correction;using factory method design pattern and satellite and sensor identification as parameters,we can select the specific systematically geometric correction algorithm.Experimental results show that the geometric corrected processing algorithms of various satellites and sensors can be added through inheriting,which ensures the scalability of data processing algorithms.