强激光与粒子束
2024, 36(1): 013002
Author Affiliations
Abstract
1 College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2 Nanhu Laser Laboratory, National University of Defense Technology, Changsha 410073, China
Radio frequency/microwave-directed energy sources using wide bandgap SiC photoconductive semiconductors have attracted much attention due to their unique advantages of high-power output and multi-parameter adjustable ability. Over the past several years, benefitting from the sustainable innovations in laser technology and the significant progress in materials technology, megawatt-class output power electrical pulses with a flexible frequency in the P and L microwave wavebands have been achieved by photoconductive semiconductor devices. Here, we mainly summarize and review the recent progress of the high-power photonic microwave generation based on the SiC photoconductive semiconductor devices in the linear modulation mode, including the mechanism, system architecture, critical technology, and experimental demonstration of the proposed high-power photonic microwave sources. The outlooks and challenges for the future of multi-channel power synthesis development of higher power photonic microwave using wide bandgap photoconductors are also discussed.
high-power photonic microwave wide bandgap photoconductive semiconductor devices linear modulation multi-parameter adjustable microwave generation multi-channel power synthesis Chinese Optics Letters
2024, 22(1): 012501
强激光与粒子束
2022, 34(7): 075006
强激光与粒子束
2020, 32(2): 025006
Author Affiliations
Abstract
1 Taiyuan Satellite Launch Center, Kelan 036300, China
2 College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
Synchronization for multiple-pulse at nanosecond range shows a great value on the power multiplication and synchronous electric fields applications. Nanosecond or sub-ns jitter synchronization is essential for the improved working efficiency of the large amounts of pulse modules and accurate requirements for the power coherent combining applications. This paper presents a trigger generator based on a laser diodetriggered GaAs photoconductive semiconductor switch (PCSS) with low jitter and compact size characteristics. It avoids the high currents that are harmful to high-gain mode PCSSs. In the trigger circuit, a 200 pF capacitor is charged by a microsecond-scale 18 kV pulse and then discharged via the high-gain mode GaAs PCSS to trigger the high-power trigatron switch. When triggered by the ~10 ns pulse generated by the PCSS, the DC-charged trigatron can operate in the 20e35 kV range with 10 ns rise time and 1 ns delay-time jitter.
Pulsed power High power switches Synchronization Trigger generator Photoconductive semiconductor switch Matter and Radiation at Extremes
2018, 3(5): 256
Author Affiliations
Abstract
1 College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, People's Republic of China
2 State Key Laboratory of Pulsed Power Laser Technology, National University of Defense Technology, Changsha 410073, People's Republic of China
This paper provides a review of the compact intense electron-beam accelerators (IEBAs) based on liquid pulse forming lines (PFLs) that have been developed at the National University of Defense Technology (NUDT) in China. The history and roadmap of the compact IEBAs used to drive high-power microwave (HPM) devices at NUDT are reviewed. The properties of both de-ionized water and glycerin as energy storage media are presented. Research into the breakdown properties of liquid dielectrics and the desire to maximize energy storage have resulted in the invention of several coaxial PFLs with different electromagnetic structures, which are detailed in this paper. These high energy density liquid PFLs have been used to increase the performance of IEBA subsystems, based on which the SPARK (Single Pulse Accelerator with spark gaps) and HEART (High Energy-density Accelerator with Repetitive Transformer) series of IEBAs were constructed. This paper also discusses how these compact IEBAs have been used to drive typical HPM devices and concludes by summarizing the associated achievements and the conclusions that can be drawn from the results.
High-power microwave (HPM) Intense electron-beam accelerator (IEBA) Pulsed power technology (PPT) Pulse forming line (PFL) Fluid of high energy density De-ionized water Glycerin Matter and Radiation at Extremes
2018, 3(6): 278
国防科学技术大学 光电科学与工程学院, 长沙 410073
针对电容储能型重频强流电子加速器对自动控制的要求, 研制了一套基于LabVIEW和PIC单片机的远程触发控制系统。本系统用普通的数据采集卡和单片机硬件实现了复杂的电路控制和时序控制, 具有信号采集、调用表格数据、控制晶闸管触发等功能, 以实现储能电容对变压器原边电容的稳定谐振充电。将该控制系统应用在重频强流电子加速器平台, 重复频率运行时, 能够保持原边电容充电的一致性和稳定性, 系统长时间运行可靠、稳定、抗干扰能力强。
储能电容 强流电子加速器 控制系统 PIC单片机 capacitive energy storage intense-electron-beam accelerator control system LabVIEW LabVIEW PIC MCU 强激光与粒子束
2016, 28(7): 075101
1 国防科学技术大学 光电科学与工程学院, 长沙 410073
2 空军驻湖南地区军事代表室, 长沙 410100
通过理论分析研究了一种高能量转换效率(高于50%)的紧凑重频空心脉冲变压器.这种脉冲变压器可以应用于PFN-Marx发生器的重频充电.通过深入分析脉冲变压器的等效模型,得到了脉冲变压器能量转换效率、次级电压峰值、初级电流峰值以及初级电流变化率最大值的表达式,并与Pspice软件的模拟结果进行比较.结果表明:理论计算的电压、电流波形与模拟计算结果基本一致,验证了理论分析的正确性.同时,通过理论分析得到了能量效率大于50%的脉冲变压器结构尺寸.
空心脉冲变压器 脉冲功率 PFN-Marx 发生器 高能量效率 air-core pulse transformer pulse power PFN-Marx generator high energy efficiency 强激光与粒子束
2015, 27(7): 75003
