摘要：In this review paper, we introduce a self-phase controlled stimulated Brillouin scattering phase conjugate mirror(SCSBS-PCM) and the Kumgang laser. The SC-SBS-PCM was proposed and demonstrated its success at the academic low power level, ~100 mJ@10 Hz. The Kumgang laser is under development to verify whether the SC-SBS-PCM is operable at the k W level. It is a 4 kW beam combination laser combining four 1 k W beams using the SC-SBS-PCM. If the Kumgang laser functions successfully, it will be the most important step towards a Dream laser, a hypothetical laser with unlimited power and a high repetition rate.

摘要：Recently there has been great progress in laser-driven plasma-based accelerators by exploiting high-power lasers,where electron beams can be accelerated to multi-GeV energy in a centimeter-scale plasma due to the laser wakefield acceleration mechanism. While, to date, worldwide research on laser plasma accelerators has been focused on the creation of compact particle and radiation sources for basic sciences, medical and industrial applications, there is great interest in applications for high-energy physics and astrophysics, exploring unprecedented high-energy frontier phenomena. In this context, we present an overview of experimental achievements in laser plasma acceleration from the perspective of the production of GeV-level electron beams, and deduce the scaling formulas capable of predicting experimental results self-consistently, taking into account the propagation of a relativistic laser pulse through plasma and the accelerating field reduction due to beam loading. Finally, we present design examples for 10-GeV-level laser plasma acceleration, which is expected in near-term experiments by means of petawatt-class lasers.

摘要：A combination of large mass,weak spring and nano-grating is the key for a nano-grating accelerometer to measure nano-G acceleration.A novel compact nano-grating accelerometer integrating a large mass with nano-grating is ***,the numbers of diffraction orders are ***,structure parameters are optimized by finite element analysis to achieve a high sensitivity in an ideal vibration ***,we design the fabrication method to form such a compact nano-grating accelerometer and successfully fabricate the uniform and well-designed nano-gratings with a period of 847 nm,crater of 451 nm by an FIB/SEM dual beam *** on the ANSYS simulation,a nano-grating accelerometer is predicted to work in the first modal and enables the accelerometer to have displacement sensitivity at 197 nm/G with a measurement range of±1 G,corresponding to zeroth diffraction beam optical sensitivity 1%/*** nano-gratings fabricated are very close to those designed ones within experimental error to lay the foundation for the sequent *** results provide a theoretical basis for the design and fabrication of nano-grating accelerometers.

摘要：A large dual-polarization microstrip reflectarray with China-coverage patterns in two operating bands is *** sufficiently compensate for the spatial phase delay differences in two operating bands separately,a three-layer rectangular patch element is addressed,which is suitable for the large dual-polarization *** to the complexly shaped areas and high gain requirements,there are more than 25000 elements in the reflectarray,making it difficult to design,due to more than 150000 optimization ***,the discrete fast Fourier transform(DFFT)and the inverse DFFT are used to establish a one-to-one relationship between the aperture distribution and the far field,which lays a foundation for optimizing the shaped-beam *** intersection approach,based on the alternating projection,is used to obtain the desired reflection phases of all the elements at some sample frequencies,and a new method for producing a suitable initial solution is proposed to avoid undesired local *** validate the design method,a dual-polarization shaped-beam reflectarray with 7569 elements is fabricated and *** measurement results are in reasonable agreement with the simulation ***,for the large broadband reflectarray with the minimum differential spatial phase delays in the operating band,an approach for determining the optimal position of the feed is *** simultaneously find optimal dimensions of each element in two orthogonal directions,we establish a new optimization model,which is solved by the regular polyhedron ***,a dual-band dual-polarization microstrip reflectarray with 25305 elements is designed to cover the continent of *** results show that patterns of the reflectarray meet the China-coverage requirements in two operating bands,and that the proposed optimization method for designing large reflectarrays with complexly shaped patterns is reliable and efficient.

摘要：首次提出一种新的梯度轴棱锥模型,这种梯度轴棱锥在传统的轴棱锥基础上,将轴棱锥顶点的锥角设计成具有一定的梯度.平面波入射到这种梯度轴棱锥,其衍射场会形成两个区域的Bessel光,并且在这两个Bessel光之间形成一个Bottle beam(局域空心光束).由于Bottle beam具有三维封闭的空心区域和极高的强度梯度,可用作激光导管、光镊和光学扳手等,在生命科学和纳米科技中有重要应用.从几何光学角度分析了梯度轴棱锥形成单个Bottle beam的原理,由衍射及相干理论,分析和模拟了纵向剖面光强分布和横截面光强分布.研究结果对梯度轴棱锥的设计和应用具有指导意义.

摘要：The physics design of a 3 MeV, 30 mA, 352.2 MHz Radio Frequency Quadrupole (RFQ) is done for the future Indian Spallation Neutron Source (ISNS) project at RRCAT, India. The beam dynamics design of RFQ and the error analysis of the input beam parameters are done by using standard beam dynamics code PARMTEQM. The electromagnetic stu-dies for the two-dimensional and three-dimensional cavity design are performed using computer codes SUPERFISH and CST Microwave Studio. The physics design of RFQ consisting of the beam dynamics design near the beam axis and the electromagnetic design for the RFQ resonator is described here.

摘要：Utility of microwave bootlace lens is well established. For broadband and wide scanning network, it is required to op-timize and use features of this lens for better communication and scanning device. This report presents the design of a compact 2D bootlace lens with five focal feed for multiple beam forming. This design will help in reducing phase error and will provide power efficiency and better resolution during target tracking. This design will provide better aperture efficiency and scanning angle.

摘要：Based on the sensing mechanism of microsensor, a simulation model of a practical silicon beam resonator attached to an E-type round diaphragm and used for measuring concentrated force is established. The relationship between the basic natural frequency of the beam resonator and the concentrated force is calculated, analyzed and investigated. As a microsensor FEM is used to study some important simulation results on the vibration features of the beam resonators. Based on the differential output signals, a set of optimum parameters of the proposed sensing unit is determined.

摘要：At the moment,a 70MeV cyclotron is under construction by the IBA *** cyclotron will be able to accelerate H- beam from a multicusp source and with a beam intensity in the range of 10mA at the source extraction.A He1+2+ beam is also *** beam will be produced by a PANTECHNIK ECR ion source（SUPERNANOGAN）with an extracted current of 1 to *** this paper the studies and design of the two sources with a common axial injection in the cyclotron are described.

摘要：唐津高速公路北环立交桥上部结构采用25 m后张预应力空心板梁,全桥共36跨总长890 m,其第20孔上跨北环双股电气化铁路,常规检查发现该跨板梁跨中梁底范围普遍存在横向裂缝,急需对该跨板梁进行更换。通过分析认为原桥设计标准偏低、近年来超载车辆激增、板梁间横向联系较弱为病害主要原因。针对病害原因,采用提高板梁荷载设计等级、增加梁高、增配普通钢筋和预应力钢筋、改变板梁间铰缝形式等措施设计新板梁。换梁施工采用切割机沿顺桥向切割板梁,用架桥机吊装新梁,并在施工过程中对铁路进行电气化防护。