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强激光与粒子束最新文献

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Research progress of adaptive optics in wireless optical communication system for Xi’an University of Technology 西安理工大学无线光通信系统中自适应光学的研究进展
Q4 Engineering Pub Date : 2021-08-15 DOI: 10.11884/HPLPB202133.210167
Ke Xizheng, Yang Shangjun, Wu Jiali, Zhong Xirui
In chronological order, this paper summarizes the research progress and technical classification of adaptive optics technology in the application of wireless optical communication system at home and abroad. Then it introduces the work of Xi’an University of Technology in this field, including adaptive optics system with wavefront measurement, adaptive optics system with wavefront-less measurement, wavefront correction of liquid crystal spatial light modulator, wavefront correction of the combination of tilt mirror and deformable mirror, spatial optical fiber coupling adaptive optical wavefront correction, etc. The adaptive optics technology can effectively correct the distorted wavefront caused by atmospheric turbulence and improve the coupling efficiency and communication performance in wireless optical communication. Although these methods are not perfect in theoretical analysis and engineering practice, they can be regarded as useful exploration in this field.
本文按时间顺序综述了自适应光学技术在无线光通信系统中应用的国内外研究进展和技术分类。然后介绍了西安理工大学在该领域的工作,包括带波前测量的自适应光学系统、无波前测量的自适应光学系统、液晶空间光调制器的波前校正、倾斜镜与变形镜组合的波前校正、空间光纤耦合自适应光波前校正等。自适应光学技术可以有效地校正大气湍流引起的波前畸变,提高无线光通信的耦合效率和通信性能。虽然这些方法在理论分析和工程实践上还不完善,但它们是该领域的有益探索。
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引用次数: 4
Magnetic axis measurement of the high precision coil for the High Intensity heavy-ion Accelerator Facility electron cooler 高强度重离子加速器设备电子冷却器高精度线圈的磁轴测量
Q4 Engineering Pub Date : 2021-08-15 DOI: 10.11884/HPLPB202133.210073
Shao Xiaoping, M. Lijun, Lu Haijiao, Yang Xiao-Dong, Yang Yanbing, Tang Meitang, Zhao Lixia, Ma Fu, Ma Xiaoming, Li Jie, He Lun, Sun Xiaolong
Electron cooling method is used for the High Intensity heavy-ion Accelerator Facility (HIAF), in order to reduce the beam emittance and momentum spread of heavy ion beams, hence to improve the accuracy and luminosity of nuclear physics and atomic physics experiments. The magnetic field homogeneity of the cooling section is the key parameter related to the cooling effect. A new type of cooling section solenoid composed of several coils was used in the HIAF electron cooling device to produce a high parallelism magnetic field. In this paper, a device for the magnetic field axis measurement of high-precision coils is presented. The geometric symmetrical axis of the coil is measured by a positioning device. The radial and axial magnetic field distribution in the center plane of the coil is measured by the rotating Hall probes. Finally, the relative angle between the coil magnetic field axis and the geometric symmetrical axis is calculated by the measurement results. The accuracy of the measured angle is within ±0.10 mrad. The measured angle of the prototype coil is (1.28±0.10) mrad, which satisfies the physics requirement.
高强度重离子加速器设备(HIAF)采用电子冷却方法,以降低重离子束的束发射度和动量扩散,从而提高核物理和原子物理实验的精度和光度。冷却段的磁场均匀性是影响冷却效果的关键参数。HIAF电子冷却装置采用了一种由多个线圈组成的新型冷却段螺线管,以产生高平行度的磁场。本文介绍了一种高精度线圈磁场轴线测量装置。线圈的几何对称轴由定位装置测量。线圈中心平面内的径向和轴向磁场分布是通过旋转霍尔探针测量的。最后,根据测量结果计算了线圈磁场轴与几何对称轴之间的相对角度。测量角度的精度在±0.10mrad以内。原型线圈的测量角度为(1.28±0.10)mrad,满足物理要求。
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引用次数: 0
The Saturn Accelerator Recapitalization Project. 土星加速器资本重组项目。
Q4 Engineering Pub Date : 2021-08-01 DOI: 10.2172/1883041
Bryan Oliver, Jonathan Douglass, M. Mazarakis, Mark Savage, K. Struve, B. Ulmen
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引用次数: 0
Numerical analysis of plasma and shock wave characteristics of the discharge in liquid 液体放电等离子体和冲击波特性的数值分析
Q4 Engineering Pub Date : 2021-07-15 DOI: 10.11884/HPLPB202133.200321
Yu Qing, Z. Hui, M. Danni
Based on conservation equation of energy, channel characteristics of the cylindrical geometry of the plasma were described under different conductivity models. The variation of the channel radius, temperature, resistance, current and dissipated energy with time is obtained. The variation of shock wave pressure at a certain distance from the center of the discharge gap is also given. The results are compared with those calculated based on the spherical geometry of the plasma channel. The purpose of this paper is to provide a reference for further study of physical and chemical characteristics and shock wave characteristics of the discharge in liquid. The results show that there is significant difference in the channel pressure and radius when the plasma channel is respectively regarded as a sphere and a cylinder, but there is little difference in other physical properties. When the physical characteristics except the shock wave characteristic are described by using three conductivity models, the change trend is almost the same, while the shock wave characteristic is described more accurately by using the conductivity model σ2. By comparing the changes of electrical parameters and pressure parameters, the applicability of the model can be selected according to the experimental data or specific research problems, which also provides a reference for further study of the physicochemical characteristics and shock wave characteristics of discharge plasma in liquid.
基于能量守恒方程,描述了不同电导率模型下等离子体圆柱形几何结构的通道特性。获得了通道半径、温度、电阻、电流和耗散能量随时间的变化。给出了在离放电间隙中心一定距离处冲击波压力的变化。将结果与基于等离子体通道的球形几何形状计算的结果进行了比较。本文的目的是为进一步研究液体放电的物理化学特性和冲击波特性提供参考。结果表明,将等离子体通道分别视为球体和圆柱体时,通道压力和半径存在显著差异,但其他物理性质差异不大。当使用三个电导率模型来描述除冲击波特性外的物理特性时,变化趋势几乎相同,而使用电导率模型σ2来更准确地描述冲击波特性。通过比较电参数和压力参数的变化,可以根据实验数据或具体研究问题选择模型的适用性,也为进一步研究放电等离子体在液体中的物理化学特性和冲击波特性提供了参考。
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引用次数: 0
Noncollinear matched broadband third-harmonic generation based on angular dispersion 基于角色散的非共线匹配宽带三次谐波产生
Q4 Engineering Pub Date : 2021-07-15 DOI: 10.11884/HPLPB202133.210074
Mao Shuoyu, Feng Bin, L. Ping, Chai Xiangxu, Wang Liquan, Wang Guanzhong, Jing Yukun
Broadband laser can effectively reduce the nonlinear effect in the process of laser plasma interaction. This paper proposes a noncollinear matching broadband third-harmonic generation based on angular dispersion, which uses the noncollinear sum frequency of the broadband fundamental wave and the narrowband second harmonic to generate broadband third harmonic, and the sum frequency process is realized by a specially designed gradient grating. The fundamental laser beams of different frequencies are incident at a specific angle, which compensates for the phase mismatch caused by the wavelength difference, so that the whole waveband meets the match condition of phase. Theoretical simulation shows that using KDP crystal type II phase matching, high efficiency broadband third-harmonic generation can be achieved by combining the broad-band fundamental wave (center wavelength 1058 nm, bandwidth 10 nm) and the second harmonic (526.5 nm).
宽带激光可以有效地减少激光与等离子体相互作用过程中的非线性效应。本文提出了一种基于角色散的非共线匹配宽带三次谐波产生方法,利用宽带基波和窄带二次谐波的非共线和频产生宽带三次谐振,并通过专门设计的梯度光栅实现和频过程。不同频率的基本激光束以特定角度入射,这补偿了波长差引起的相位失配,使整个波段满足相位匹配条件。理论模拟表明,使用KDP晶体II型相位匹配,通过将宽带基波(中心波长1058nm,带宽10nm)和二次谐波(526.5nm)相结合,可以实现高效的宽带三次谐波产生。
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引用次数: 0
5 kW oscillating-amplifying integrated fiber laser with high reliability 5kw高可靠性振荡放大集成光纤激光器
Q4 Engineering Pub Date : 2021-07-15 DOI: 10.11884/HPLPB202133.210245
Xi Xiaoming, Zeng Lingfa, Zhang Hanwei, W. Peng, Yang Baolai, Wang Xiao-lin, X. Xiaojun
We demonstrated a novel fiber laser system with oscillating-amplifying integrated configuration and a 5 kW output power was achieved experimentally for the first time with optical-to-optical efficiency of 80%. The reliability and the boot order of the laser system were studied intensively at high power level. When the laser system is deliberately turn on in a wrong order, such as the pump of the amplifying section is switched on before the oscillating section, or the pump of the oscillating section is switched off before the amplifying section, which is normally a disaster in a classic main oscillator power amplifier (MOPA) system, the laser system can trouble-free operate at full power level. For the first time, it is verified that there is no priority between the amplifier and the seed in the oscillating-amplifying integrated fiber laser system.
我们展示了一种具有振荡放大集成配置的新型光纤激光器系统,并首次通过实验获得了5kW的输出功率,光-光效率为80%。对激光系统在高功率下的可靠性和引导顺序进行了深入的研究。当激光系统故意以错误的顺序开启时,例如在振荡部分之前开启放大部分的泵浦,或者在放大部分之前关闭振荡部分的泵浦(这在经典的主振荡功率放大器(MOPA)系统中通常是灾难),激光系统可以在全功率水平下无故障地操作。首次验证了振荡放大集成光纤激光器系统中放大器和种子之间没有优先权。
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引用次数: 0
Design and implementation of module fault interlock and protection system of HIAF-BRing power supply prototype HIAF-BRing电源样机模块故障联锁保护系统的设计与实现
Q4 Engineering Pub Date : 2021-07-15 DOI: 10.11884/HPLPB202133.210034
T.D. Yulian, Wu Fengjun, W. Xiaojun, Yan Hongbin, Huang Yuzhen, Lin Yuhang, Li Jiqiang, Zhang Shuai, Zhang Huajian, Zhuang Fangfang, Gao Daqing
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.
高能重离子加速器装置-助推环(HIAF-BRing)电源样机采用全能量快周期存储脉冲电源拓扑方案。其多模块采用串并联方式连接,功率达到兆瓦级。针对电源功率大、规模大的特点,设计并实现了一种基于可编程控制器(PLC)、联锁板和现场可编程门阵列(FPGA)的模块故障联锁保护系统。本文首先介绍了一种双冗余模块故障联锁的设计。其次,描述了PLC中实现的逻辑。第三,给出了FPGA的相关工作。最后,从电源联锁回路的响应时间、控制器发生错误到完成联锁的总时间、设备故障响应三个方面对系统进行了测试。结果表明,该模块故障联锁系统在故障发生时动作灵敏、及时、可靠,满足了haf - bring电源样机的要求。
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引用次数: 0
Micro-focus computed tomography for turbine blade based on all-optical bremsstrahlung source 基于全光韧致辐射源的涡轮叶片微聚焦计算机断层扫描
Q4 Engineering Pub Date : 2021-07-15 DOI: 10.11884/HPLPB202133.210201
Guo Bo, Liu Dexiang, Wu Shuanghua, Ma Yue, Hu Jianfei, Lu Wei
Computed tomography is a major technique for nondestructive detection of internal defects of dense materials and large-size devices. It is widely used in material science, railway, aerospace, national defense, military industry and other industries. At present, conventional high-energy industrial computed tomography system uses the X-ray source based on traditional thermionic RF electron gun, which can only provide millimeter source size, thus limiting its imaging spatial resolution. A high-energy micro-focus X-ray source is the key means to realize high-resolution high-energy industry computed tomography. As an emerging accelerator technology, the laser wakefield accelerator is a promising candidate for the micro-focus high-energy industrial computed tomography. This article reports experimental results of a micro-focus X-ray source based on laser wakefield acceleration and a computed tomography for a turbine blade. Using a 20 TW Ti: sapphire laser system, an electron beam with a charge of (140±44) pC is generated through ionization-induced injection, and then an all-optical bremsstrahlung X-ray source with an accumulated source size of 25 μm is obtained by using a 1.5 mm tungsten target. Using this source, a preliminary compressed-sensing-based computed tomography for a turbine blade is performed.
计算机断层扫描是致密材料和大尺寸器件内部缺陷无损检测的主要技术。广泛应用于材料科学、铁路、航空航天、国防、军工等行业。目前,传统的高能工业计算机断层扫描系统使用基于传统热离子射频电子枪的x射线源,只能提供毫米级的源尺寸,从而限制了其成像空间分辨率。高能微聚焦x射线源是实现高分辨率高能工业计算机断层扫描的关键手段。激光尾流场加速器作为一种新兴的加速器技术,在微聚焦高能工业计算机断层成像中具有广阔的应用前景。本文报道了基于激光尾流场加速和计算机断层扫描的微聚焦x射线源涡轮叶片的实验结果。利用20 TW的Ti:蓝宝石激光系统,通过电离诱导注入产生电荷为(140±44)pC的电子束,然后利用1.5 mm钨靶获得累积源尺寸为25 μm的全光轫致辐射x射线源。利用该源,对涡轮叶片进行了初步的基于压缩感知的计算机断层扫描。
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引用次数: 0
Research on theoretical model of bulk current injection replacing radiation about shielded two-core wire 屏蔽双芯线大电流注入替代辐射的理论模型研究
Q4 Engineering Pub Date : 2021-07-15 DOI: 10.11884/HPLPB202133.200354
Sun Jiangning, Pan Xiaodong, L. Xinfu, Wan Haojiang, Wei Guanghui
Large-scale space simulation of high field intensity electromagnetic environment is difficult to test radiation effects, and there are gaps in the application of existing BCI (bulk current injection) technology to nonlinear system tests. The research on the equivalent alternative radiation test method of the shielded cable coupling channel is carried out. Taking the equal response of the tested equipment as the equivalent basis, an analysis model of the response of the EUT (equipment under test) under the two conditions of radiation method and injection method is established. The equivalent corresponding relationship between the injection excitation source voltage and the radiation field intensity is deduced, and the conditions and test methods for the equivalent replacement of radiation with BCI are proposed and verified by experiments. The research results show that the BCI method can be accurately equivalent to the radiation effect test of the EUT, and the test error does not exceed 2 dB, which can meet the actual needs of the project.
高场强电磁环境的大尺度空间模拟难以测试辐射效应,现有的BCI (bulk current injection)技术在非线性系统测试中的应用存在空白。对屏蔽电缆耦合通道等效替代辐射测试方法进行了研究。以被测设备的等效响应为等效基础,建立了辐射法和注入法两种工况下EUT(被测设备)的响应分析模型。推导了注入激励源电压与辐射场强的等效对应关系,提出了用BCI等效替代辐射的条件和测试方法,并通过实验进行了验证。研究结果表明,BCI方法可以准确等效于EUT的辐射效应测试,测试误差不超过2 dB,可以满足工程的实际需要。
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引用次数: 0
2.5-D discontinuous Galerkin time-domain method for Maxwell equations Maxwell方程的2.5-D间断Galerkin时域方法
Q4 Engineering Pub Date : 2021-07-01 DOI: 10.11884/HPLPB202133.210056
Hou Yiran, Wang Yu-heng, Wang Xianghui, Zhan Jie, Qi Hongxin
In this work, a 2.5-dimensional discontinuous Galerkin time-domain(2.5D-DGTD) method with perfectly matched layer is proposed as a flexible tool to solve accurately electromagnetic problems that media are homogeneous in one direction. Two numerical examples are simulated to demonstrate the advantages of the proposed scheme, which are the coupling between an electric dipole and optical fiber, and the analysis of dispersion characteristics of a photonic crystal fiber. Compare with the traditional 2.5-dimensional finite-difference time-domain method. The results show that the 2.5D-DGTD is more realistic, especially for the simulation of curved shapes, the calculation memory is reduced by 10.4%, the calculation accuracy differs by 0.011%, the calculation time is shortened, and the calculation efficiency is increased by 74.9%.
本文提出了一种具有完全匹配层的2.5维不连续Galerkin时域(2.5D-DGTD)方法,作为一种灵活的工具来精确求解介质在一个方向上均匀的电磁问题。通过两个数值算例验证了该方案的优点,即电偶极子与光纤之间的耦合,以及光子晶体光纤的色散特性分析。与传统的2.5维时域有限差分方法进行了比较。结果表明,2.5D-DGTD更符合实际,特别是对于曲线形状的模拟,计算内存减少了10.4%,计算精度差异了0.011%,计算时间缩短,计算效率提高了74.9%。
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引用次数: 0
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强激光与粒子束
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