基于PLC的110MW脉冲调制器控制器设计

论述了110MW脉冲调制器控制器的设计，简要比较了几种在工业场合中常用的控制器。调制器控制器核心采用PLC可编程控制器。控制器实现了对调制器联锁信号、电路状态信号的实时监测，闸流管预热系统、速调管预热系统等流程的控制，高压恒流充电电源的控制以及与加速器控制室的数据通信。调制器长期运行表明控制器工作稳定、可靠。     

7kA闸流管脉冲调制器的可编程控制器控制

利用ＰＬＣ（可编程控制器）作为冲击磁铁脉冲调制器的设备控制器,解决了大电流脉冲放电对设备控制器的干扰问题,实现了调制器的计算机遥控操作及联锁保护功能、实时通讯功能,提高了调制器实验装置运行的可靠性。     

50MW速调管脉冲调制器的PLC控制

介绍了合肥同步辐射光源(HLS)50MW大功率速调管脉冲调制器改造项目。在该项目中,采用可编程控制器(PLC)监控系统取代了原有的基于继电器逻辑电路的监控系统,使其成为HLS基于先进的控制软件EPICS的新控制系统的一部分;采用恒流逆变充电电源取代了原来的工频高压电源,使调制器技术更先进、运行更加可靠。本文给出了调制器PLC控制系统的设计方法和软硬件的实现及运行情况。     

脉冲调制器机柜屏蔽效能分析测试

高功率脉冲调制器是电子直线加速器(LINAC)的功率源,脉冲调制器在运行中会产生很强的电磁干扰.为了满足上海光源LINAC的高精度要求,脉冲调制器必须尽量抑制这些电磁干扰.本文介绍对上海光源150MeV高性能LINAC调制器的电磁辐射抑制的分析研究和测试.分析了电磁辐射的泄漏途径,对调制器机柜的屏蔽效能进行了定性、定量分析,并进行了测试.验证了调制器机柜的EMC设计制作对电磁干扰抑制的有效性.     

高功率固态脉冲调制器关键技术研究

为了满足自由电子激光装置对于直线加速器微波功率源更新更高的性能指标,设计了基于绝缘栅双极性晶体管(IGBT)模块为开关的大功率固态调制器系统。调制器采用感应叠加拓扑结构,设计输出峰值脉冲功率13 MW,脉冲电压130 kV,脉冲电流100 A。详细介绍了大功率调制器的单元电路以及单元模块中关键的辅助电路,包括开关管的保护电路、阻尼吸收回路、去磁电路和补偿电路。利用软件对调制器系统进行模拟仿真,并对可能出现的模块差异性进行比较。结果表明,感应叠加型固态脉冲调制器技术是可行的。     

相衬CT原理测试装置控制系统设计

相衬CT相比传统CT具有巨大优势,本文介绍了相衬CT原理测试装置的控制系统。该控制系统采用上下位机结构。上位机采用跨平台的PyQt框架,通过以太网与下位机通信。下位机由时序控制器、运动控制器、高压电源控制器、联锁控制器等组成,实现对前端设备的控制,协调设备间的工作次序,并提供人身和设备的安全联锁功能。相衬CT原理测试装置现在已开发完成,进行了装置的总体联调与测试。测试过程中控制系统运行稳定,界面友好,达到了设计要求。     

微波功率源实验平台的控制系统研究

清华大学加速器实验室搭建的微波实验平台,是由全固态调制器、速调管、微波波导等主要设备组成,用于微波功率合成及测量的综合性实验平台。为确保实验平台的安全稳定运行,考虑到实验室环境的具体要求,设计了PLC与LabVIEW组成的双层分布式控制系统。其底层仪器设备可直接通过PLC进行开断控制,具有操作简单、安全稳定的优势;在上层的工控机上利用LabVIEW程序编写OPI,通过与PLC实时通讯,实现了对各仪器设备的状态监测和远程控制,具有良好的人机交互功能;通过设计快速驻波比保护装置,实现了对微波的μs级中断控制。结果表明,这种双层分布式结构的控制系统不仅确保了实验平台的安全稳定运行,而且具有良好的可视化监测控制,能简易方便地实现对实验室内小型微波系统的控制,可操作性强。     

西安脉冲堆计算值和实测结果分析

介绍了西安脉冲堆堆芯布置、计算模型和程序以及计算值与实验测量结果分析。西安脉冲堆在满功率（2MW）下连续运行了72小时，证明西安脉冲堆整个系统和设备是良好的、安全可靠的。根据西安脉冲堆计算值与测量值的比较，证明计算程序可靠，具有较高精度。西安脉冲堆理论计算值与实验测量值符合较好，完全满足工程设计要求，实验测量结果达到了设计指标的要求。     

基于CPLD﹑单片机和网络的固态调制器触发控制

介绍了一种用于固态脉冲调制器的触发和控制系统。用CPLD非常方便地产生了固态调制器触发所需要的频率和宽度均可调节的脉冲信号,为了将来能通过网络在上位机上远程调节调制器触发信号,我们使用了单片机AT89C51和网卡控制芯片RTL8019AS。本文介绍了整个系统软硬件的设计原理。     

我国第一座脉冲堆稳态运行试验

本文简要地介绍了我国第一座脉冲堆稳态运行试验方法和设施,给出了冷态和热态以及不同功率下的临界棒位,并给出了反应性、中子通量、功率系数、平衡氙毒和碘坑的测量结果,提供了一批有价值的工程试验数据。本堆实现了1MW 稳态功率运行,进行了连续72小时满功率运行,对反应堆的控制、保护、测量仪器及各系统和设备进行了考验。试运行结果表明:本堆性能良好,各项指标均已达到了设计要求。     

LIGA技术制备正电子慢化体的实验研究

LIGA技术是具有加工精度高、深宽比大、表面平整、应用领域广等优点，是一种先进的微细加工方法，实验中将LIGA技术的优点用于正电子慢化体的制作中，能获得传统加工方法无法制作出的薄壁网状多孔镍结构，满足新型正电子慢化体的制备要求。本文报道了用LIGA技术制作正电子慢化体的实验研究。     

Design of 150kV bouncer modulator

The 150 kV bouncer modulator is designed to drive the 10 MW multi-beam klystron for the DESY TESLA Test Facility. The modulator is different from the 10 kV modulators previously built at Fermilab. First, the new 150 kV bouncer modulator has no transformer, so the modulator circuit is simplified and the output waveform is improved well. Second, the bouncer circuit has been changed to fit the output need, which is the most significant challenge. This paper gives the design of the 150 kV long pulse bouncer modulator.     

Simulation calculation of 24kV long pulse TESLA modulator

1 Introduction output pulse is designed to meet the following speci- fications: The 24 kV long pulse modulator converts AC line Output voltage: 120 kVvoltage to pulsed high voltage in the 120 kV range to Output current: 138 Abe applied to the Thomson TH1801 multibeam kly- Pulse width: 1.7 msstron catho…     

电子直线加速器串联谐振充电电源的设计与实现

电子直线加速器一般使用线型脉冲调制器作为脉冲电源。在脉冲调制器充电系统中,使用LC串联谐振充电技术为脉冲形成网络（PFN）充电可提高效率并减小体积,是大功率线型脉冲调制器的发展方向之一。本工作基于串联谐振充电技术的基本原理,设计并制造了1台脉冲调制器样机,结合实测波形和工程应用,提出了改善稳定度的方法。测量结果表明,脉冲调制器样机的设计方案正确,实现了设计指标。     

Extending Bragg peak of heavy ion beam and melanoma cell inactivation measurement

A rotating range modulator was designed and manufactured.which is applied to extend Bragg peak of heavy ion beam.Bragg curves of 75MeV/u ^16O and 75MeV/u ^12C ion beams through this range modulator were measured respectively and two evident spread-out Bragg peaks corresponding to the modulated beams above are shown.In addition,inactivation effect of the modulated 75MeV/u ^16O ion beam at nine different penetration depths on melanoma cells(B16) was measured.Results indicate that lethal effects at the spread-out Bragg peak region are larger than at the plateau of the particle beam entrance.     

Results of a modulator pulse top ripple reduction study

The design of a modulator that can produce high-voltage klystron drive pulses with minimal ripple on the top is described. The design study focused on ways to reduce ripple and adjust the shape of the pulse to minimize variations in the final output of the klystron. Comparisons of the pulse performance for a range of possible loads were done to determine the sensitivity of the design to load characteristics. The resulting modulator design incorporates dual pulse forming networks, and uses a cancellation scheme to reduce ripple. The basic design, simulations and the performance of a low-power prototype are discussed. A high-power klystron modulator design is summarized     

Dislocation imaging of an InAlGaAs opto-electronic modulator using IBICC

This paper presents Ion Beam Induced Charge Collection (IBICC) contrast images showing regions of differing charge collection efficiency within optoelectronic modulator devices. The experiments were carried out at the Sandia Nuclear Microprobe using 18 MeV carbon and 2 MeV helium ions. Lines of varying densities are observed to run along the different {110} directions which correlate with misfit dislocations within the 392 nm thick strained-layer superlattice quantum well of the modulator structure. Independent cross-sectional TEM studies and the electrical properties of the devices under investigation suggest the presence of threading dislocations in the active device region at a density of 10⁶ cm⁻². However, no clear evidence of threading dislocations was observed in the IBICC images as they are possibly masked by the strong contrast of the misfit dislocations. Charge carrier transport within the modulator is used to explain the observed contrast. The different signal to noise levels and rates of damage of the incident ions are assessed.     

小型电子直线加速器脉冲调制器输出电路的拓扑结构

在小型电子直线加速器中使用各种脉冲调制器输出电路拓扑结构以适应不同的调制器负载要求。对不同的拓扑所遇到的一些共同性问题进行了详尽的叙述与讨论。     

Soft switching circuit to improve efficiency of all solid-state Marx modulator for DBDs

For an all solid-state Marx modulator applied in dielectric barrier discharges (DBDs),hard switching results in a very low efficiency.In this paper,a series resonant soft switching circuit,which series an inductance with DBD capacitor,is proposed to reduce the power loss.The power loss of the all circuit status with hard switching was analyzed,and the maximum power loss occurred during discharging at the rising and falling edges.The power loss of the series resonant soft switching circuit was also presented.A comparative analysis of the two circuits determined that the soft switching circuit greatly reduced power loss.The experimental results also demonstrated that the soft switching circuit improved the power transmission efficiency of an all solid-state Marx modulator for DBDs by up to 3 times.