9MeV无损探伤电子直线加速器用脉冲调制器研制

核技术所62室研制的脉冲调制器是9 MeV无损探伤电子直线加速器的重要组成部件之一,它的负载是MG5193型磁控管和电子枪。 其设计指标为:脉冲峰值电压,48 kV;脉冲峰值电流,110 A;电子枪脉冲峰值电压,10.6 kV(1档),11.3 kV(2档);电子枪脉冲峰值电流,500 mA;脉冲半宽度(71%) ,4.2 m     

电子直线加速器电子枪栅控脉冲板的短脉冲特性研究

用等效电路法探讨了电子枪栅控脉冲板的短脉冲输出波形及幅度，并给出与关晶体管数量间的关系。依此研制成功的脉冲板满足了中国科学技术大学国家同步辐射实验室２００ＭｅＶ电子直线加速器的要求，该设备几年来一直稳定工作。     

大功率脉冲调制器随机跳闸问题

在电子直线加速器的长期运行中,大功率脉冲调制器的主闸流管时有连通现象,引起随机性跳闸,经研究发现这是由于供给触发脉冲的同步触发器产生随机脉冲而造成的。因此,同步触发器采用了一些抗干扰措施,还专门设计了“自锁电路”,有效地解决了大功率     

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.     

医用电子直线加速器的测量

本文概要介绍了加速器的一般知识和测量准备工作，较详细地介绍了对加速器吸收量，百分深度剂量，射线能量，射野离轴比，射野均坦度等几个主要项目的测量和计算方法，并重点强调了对加速器进行正确可靠的剂量，是放射治疗质量保证和质量控制的重要环节。     

多种能量输出的电子直线加速器方案设计

由于电子加速器的设备规模和投资较大,随电子加速器在工业生产和社会中的应用越来越多,人们希望同一台加速器能输出多种能量的电子束,以满足不同场合的需求,达到一机多用的目的。     

8MeV电子直线加速器

一、QDJ-10电子直线加速器的组成这是一台行波电子直线加速器,它所用的加速管是建造BJ-10医用电子直线加速器的备用加速管,其设计参数见文献[1]。加速管采用的是三均匀段盘荷波导结构,工作频率2998 MHz,π/2模,三段共90个腔。总长220厘米。     

100MeV电子直线加速器激励系统

文章描述了100MeV电子直线加速器激励系统的原理、结构、调试结果和主要技术性能。该系统的中功率速调管放大器能够输出15kW的脉冲功率,经微波输出部分分别激励6只高功率速调管。结果表明,系统结构简单,性能良好,完全满足加速器的使用要求。     

辐照食品直线加速器电子枪设计

本文介绍了中国科技大学国家同步辐射实验室研发的一台食品辐照保鲜用直线加速器中电子枪的设计.通过枪体内电磁场模拟计算、优化电子枪形状、并且在考虑空间电荷效应情况下对电子束发射过程进行模拟,得到了满足设计要求的束斑尺寸.另外对电子枪的加工和调试过程也进行了介绍,通过电子枪高压老炼及出束实验表明,其各项参数性能均达到设计要求.另外对直线加速器螺线管聚焦线圈漏场对束流的影响也作了讨论,采用相应措施可增加磁屏蔽,减小漏场影响,保证束流品质.     

Research of a fractional-turn ratio saturable pulse transformer and its application in a microsecond-range pulse modulator

As a combination device for a step-up pulse transformer and a magnetic switch,the saturable pulse transformer is widely used in pulsed-power and plasma technology.A fractional-turn ratio saturable pulse transformer is constructed and analyzed in this paper.Preliminary experimental results show that if the primary energy storage capacitors are charged to 300 V,an output voltage of about 19 kV can be obtained across the capacitor connected to the secondary windings of a fractional-tum ratio saturable pulse transformer.Theoretical and experimental results reveal that this kind of pulse transformer is not only able to integrate a step-up transformer and a magnetic switch into one device,but can also lower the saturable inductance of its secondary windings,thus leading to the relatively high step-up ratio of the pulse transformer.Meanwhile,the application of the fractional-turn ratio saturable pulse transformer in a μs range pulse modulator as a voltage step-up device and main switch is also included in this paper.The demonstrated experiments display that an output voltage with an amplitude of about 29 kV,and a 1.6 μs pulse width can be obtained across a 3500 Ω resistive load,based on a pulse modulator,if the primary energy storage capacitors are charged to 300 V.This compact fractional-turn ratio saturable pulse transformer can be applied in many other fields such as surface treatment,corona plasma generation and dielectric barrier discharge.     

大功率电子辐照加速器扫描磁铁芯管的研制

扫描磁铁芯管的研制是大功率电子辐照加速器引出系统的关键技术之一,本文详细叙述了扫描磁铁芯管的选材、结构设计和加工工艺,并利用有限元方法对芯管壁面加强筋的形状及位置进行了优化,对芯管的焊接工艺进行了总结归纳,最终保证该芯管在大功率烟气脱硫加速器上使用时状况良好.     

Characteristics of the beam injection system in an electron LINAC

The main characteristics of an electron beam injection system are described; the system is used for injecting and focusing electron beams into the acceleration structure of an 10 MeV linear electron accelerator. The beam injection system consists of a Pierce convergent diode-type electron gun with pulse modulator for power supply and a thin axially symmetric lens. The perveance and the capture coefficient were optimized by the analogical resistors network. This type of injection system was used in the linear electron accelerators: ALIN - 3 MeV, ALIN - 10 MeV and ALID − 8 MeV, performed at NILPRP^∗ Bucharest, Romania.     

用于非弹性散射谱和俘获谱测量的高压脉冲电源设计

设计了用于非弹性散射谱和俘获谱测量的时间、幅度可调离子源脉冲电源。采用单端正激式结构和软开关技术,逆变输出高压脉冲,占空比从0．1～0．5可调,最小脉宽8μs。目前该脉冲电源已成功应用于煤质快速分析仪中,测量精度明显优于直流方式。     

烟气脱硫用超大功率电子加速器引出窗的研制

近些年来,人们越来越重视工业气体产生的污染,尤其是工业气体中硫产生的大气污染和酸雨.大功率电子加速器产生的电子束烟气脱硫工艺由于其脱硫效率高,没有二次污染而倍受关注.引出窗作为加速器的关键部件之一,其使用寿命直接影响加速器运行的稳定.本文论述了我所研制的烟气脱硫用超大功率电子加速器引出窗与其他结构引出窗相比较的优点,并详细介绍了该引出窗的选材、结构、更换以及维护等问题.     

Research of magnetic self-balance used in a repetitive high voltage rectangular waveform pulse adder

Compared with a sinusoidal operation, pulsed operation has more homogeneity and more efficiency in dielectric barrier discharge. In this paper, an improved pulse adder is designed and assembled to create repetitive high voltage rectangular pulses when resistive loads or capacitive loads exist. Beyond the normal pulse adder based on solid-state switches, additional metal–oxide–semiconductor field effect transistors are used in each stage for a faster falling edge.Further, the voltage difference between stages is eliminated by balancing windings. In this paper,we represent our theoretical derivation, software simulations and hardware experiments on magnetic self-balance. The experiments show that the voltage difference between stages is eliminated by balancing windings, which matches the result of simulations with almost identical circuits and parameters.