2010 Vol. 22, No. 12

Recommend Articles
ICF与激光等离子体
Rapid growth of large size KDP crystal by temperature reduction method
zhuang xinxin, ye liwang, wang jiancheng, su genbo, zheng guozong, he youping, lin xiuqin, hu guoxing, zhao yuan
2010, 22.
Abstract:
Potassium dihydrogen phosphate (KDP) and its deuterated analog are the crystals primarily selected for Pockel’s cells or frequency conversion plates in inertial confinement fusion systems. Crystals rapidly grown from point seed by temperature reducti...
Damage characteristic improvement of high reflectors by SiO2 overlayer
liu xiaofeng, li xiao, zhao yuan'an, li dawei, shao jianda, fan zhengxiu
2010, 22.
Abstract:
In order to study the damage mechanism of high reflectors in high power laser systems, laser damage experiments are carried out on fundamental frequency high reflectors which are widely used in high power laser systems, and then the typical morpholog...
Effect of modifiers on uniformity of spin-coated sol-gel silica antireflective films
yang wei, li haibo, zhang qinghua, ma hongju, hui haohao, liu zhichao, ma ping
2010, 22.
Abstract:
The mechanism of radiative striations in spin-coated sol-gel silica antireflective films was analyzed. Several kinds of fluoroalkanol modified sols were prepared using the Stber method in order to improve the surface properties of the spin-coated fil...
Characteristics of plasma in spatial filter pinhole of high power laser system
zhang xin, yuan qiang, zhao junpu, hu dongxia, dai wanjun, zhou wei, jiang xuejun, deng wu, zhang kun
2010, 22.
Abstract:
The pinhole closure phenomena in spatial filter of high power solidstate laser system might limit the output energy and affect the safe operation of the laser system. The distribution of plasma created by intense laser radiation is studied. The nume...
Profile analysis and power spectrum evaluation of ICF shell X-ray image
zhao xuesen, gao dangzhong, ma xiaojun, tang yongjian, zhang lin, sun tao, dong shen
2010, 22.
Abstract:
Theoretical analysis of ICF shell X-ray radiography mechanism and the derived digital image’s profile edge forming is carried out. In order to determine the center and radius of the microsphere accurately, the least square fitting expressions with so...
Self-focusing propagation of ultra-short ultra-intense laser in under-dense plasmas
zhu bin, wu yuchi, dong kegong, wang lei, hong wei, liu hongjie, wen xianlun, jiao chunye, teng jian, he yingling, gu yuqiu
2010, 22.
Abstract:
Experiments have been performed using ultra-short (30 fs) ultra-intense laser pulse (up to 1018 W/cm2) focused into under-dense plasmas. A probe pulse was used for the shadowgraphy and the investigation on the propagation of laser under various condi...
Preparation of poly(imine imine ketone)s microshells
cui yi, luo xuan, fan yongheng, liu lei, lin runxiong, zhang lin
2010, 22.
Abstract:
Large diameter (0.6~2.0 mm) microshells of poly (imine imine ketone)s (PIIKs) were prepared by microliquid technique and doublelayer latex technique. A double T-channel droplet generator was designed and developed for the fabrication of PIIKs micro...
Unfolding soft X-ray spectra in ICF experiments with base function method
song tianming, yang jiamin, yi rongqing
2010, 22.
Abstract:
In inertial confinement fusion experiments, three 14-channel soft X-ray spectrometers are used to detect the soft-X-ray spectra and obtain the time history of radiation flux and equivalent temperature. Base function method is one of the unfolding met...
Fabrication of polystyrene porous films with gradient pore structures
yan hongwei, zhang lin, li bo, yin qiang
2010, 22.
Abstract:
Silica opals and multilayer heterostructures were fabricated by vertical deposition technique. Polystyrene inverse opals and gradient porous structures were obtained by colloidal templating, in order to control the pore microstructure of polymer poro...
Catalyst-free preparation of low density melamine-formaldehyde aerogel
shang chengwei, hu wencheng, ren hongbo, zhang lin
2010, 22.
Abstract:
Low density melamine-formaldehyde(MF) aerogels were prepared by sol-gel method and CO2 supercritical drying process. Melamine and formaldehyde were used as precursors and Di methyl sulfoxide (DMOS) was used as solvent. The obtained MF aerogel had a l...
Electrodepositing of Au on hollow PS micro-spheres
sun jingyuan, zhang yunwang, du kai, wan xiaobo, xiao jiang, zhang wei, chen jing, zhang lin
2010, 22.
Abstract:
Using the self-regulating new micro-sphere electrodepositing device, the techniques of electrodepositing gold on hollow PS micro-spheres were established. The experiment was carried out under the following conditions:voltage was about 0.7~0.8 V, curr...
Preparation and characterization of phlorogluctinolacetaldehyde organic aerogels
yang xiao, wang chaoyang, fu zhibing, zhang houqiong, tang yongjian, wei jianjun
2010, 22.
Abstract:
Organic aerogels were synthesized by sol-gel polycondensation of phlorogluctinol(P)with acetaldehyde(A) in a slightly alcohol solution, Na2CO3 as the base catalyst, followed by crosslink, solvent exchanging, and drying with supercritical carbon dioxi...
Characterization of inner surface roughness for ICF capsules by backlit shadowgraphy
liu yuanqiong, zhao xuesen, lei haile, xie duan, gao dangzhong
2010, 22.
Abstract:
A backlit shadowgraphy technique has been developed, which can be used for nondestructive characterization of ice layer’s inner surface quality for transparent ICF capsules. The physics of the bright band formation for single-layer shell is analyzed ...
Collapse behavior of laser beam in plasma
chen huaying, liu sanqiu
2010, 22.
Abstract:
On the basis of the nonlinear equation for the wave packet of the elliptically polarized laser electric field, the Lagrange density function of the nonlinear equation is constructed by means of field theory. It is shown that the energy focus of the w...
Measurement of femtosecond laser focusing spot by optical imaging and pinhole method
wu yuchi, he yingling, zhu bin, wen tianshu, dong kegong, guo yi, sun li, li qing, wang xiaodong, gu yuqiu
2010, 22.
Abstract:
For the interaction experiments between ultra-intense laser and targets, characterizing the laser focusing spot is very important. Two different methods were adopted on SILEX-Ⅰ Ti:sappire femtosecond laser system. One is directly imaging the laser sp...
Fabrication of carbon aerogel sheet and techniques of removing its dense layer
zhong yanhong, zhou bin, gui jiayin, du ai, xu xiang, zhu xiurong, wu guangming, zhang zhihua, shen jun
2010, 22.
Abstract:
This paper introduces the fabrication of carbon aerogel sheets with different thicknesses and densities and corresponding superficial micro-treatments. By resorcinol and formaldehyde’s polymerization reaction and via a self-made flexible mould, a ser...
粒子束技术
Electron trapping by two parallel-propagating intense laser beams
wang jiaxiang, ren na, li ankang, li guibo
2010, 22.
Abstract:
In order to enhance the signal of the weak nonlinear strong-field phenomenon induced by free electron interaction with intense laser fields, a scheme to trap the high-energy electrons by two parallel-propagating laser beams has been proposed. The mec...
Harmonics spontaneous emission due to electron motion in laser standing wave
zhou suyun, yuan xiao
2010, 22.
Abstract:
The dynamics and harmonics emission spectra due to electron motion in laser standing wave have been investigated considering a single electron model. The motion status of electron and harmonics radiation spectra are numerically analyzed. The electron...
Experiment study on technologies for laser-driven flyer hypervelocity launch
dai fu, gong zizheng, cao yan, niu jinchao, tong jingyu, xiang shuhong, yang liming
2010, 22.
Abstract:
The paper introduces the factors that influence the technologies for laser-driven flyer hypervelocity launch, and studies the effects of laser energy, spatial distribution of laser beam and deposition techniques of coatings on the velocity and integr...
Effects of electrode voltage and gap on discharge in RF atmospheric pressure argon
zhuang juan, wang dezhen, liu liying
2010, 22.
Abstract:
On the basis of one-dimensional fluid model, the characteristics of radio frequency discharge at atmospheric pressure in argon using bare metal electrode are numerically investigated. The primary processes of excitation and ionization in Ar are consi...
Numerical simulation of ion thruster discharge chamber
he wusheng, sun anbang, mao genwang, huo chao, chen maolin
2010, 22.
Abstract:
For better understanding of the plasma physical mechanism in the discharge chamber, the discharge chamber of Kaufman ion thruster was researched numerically, the primary electrons are treated as particles and the secondary electrons and ions are desc...
Experimental investigation on currents produced by obliquely incident X rays
dan jiakun, li jianfeng, huang xianbin, yang libing, zhang siqun, ouyang kai, li jun, duan shuchao
2010, 22.
Abstract:
Experimental setup was designed to distinguish photoelectric effect, thermoelectric effect and Compton effect in X rays and metal interaction. Measurements of currents in metals irradiated by obliquely incident X rays produced by X pinch show that ph...
Secondary proton removing effects of imaging lenses in proton radiography
liu jin, zhang linwen, shi jiangjun, liu jun
2010, 22.
Abstract:
In order to understand the effect of imaging lenses on imaging quality of proton radiograph, the research on the secondary proton-removing effect of imaging lenses has been carried out. The analytical results show that, the secondary protons’ energy ...
Explosion dynamics of heteroclusters in ultraintense femtosecond laser field
gao qiwen, li shaohui
2010, 22.
Abstract:
The explosion dynamics process of heteroclusters ((CH4)n,(CD4)n,(D2O)>)n) in ultraintense femtosecond laser fields has been studied theoretically using Bethe model. It is found that the average energy of hydrogen ions and deuterium ions after expl...
Effects of air ionization on particle holographic image
cao liang, cao na, xu qing, ma jiming, zhang zhanhong, xue jun, cui guangbin
2010, 22.
Abstract:
In particle field holography, an optical system named 4F system is usually used for imaging particles in an appropriate position. At the real focus of the 4F system, air will be ionized when the laser pulse energy increases. In this case, intensity d...
Discharge characteristics of plasma jet at atmospheric pressure and its sterilization efficacy
liu wenzheng, yan wei, hao yuchong
2010, 22.
Abstract:
A plasma jetting system with the use of the coaxial dielectric barrier electrodes is introduced. It can create glow discharge helium plasma in the air, and be applied to sterilization without both reaction vessel and vacuum system. Some factors such ...
Fabrication of bulk nanocrystalline Ni by spark plasma sintering
yu zhengwei, luo jiangshan, lei haile, liu ying, han shangjun, wu weidong, tang yongjian
2010, 22.
Abstract:
Ni nano-particles were prepared by flow-levitation method. And then, bulk nanocrystalline Ni samples, 10 mm in diameter and 2 mm in height with a relative density of 96.8 % and a microhardness of 4.17 GPa, were fabricated by spark plasma sintering us...
Self-adaptive adjustment of inverse range of dynamic light scattering particle sizing based on multi-scale transform
wang yajing, shen jin, zheng gang, sun xianming, liu wei
2010, 22.
Abstract:
In dynamic light scattering particle sizing, the inverse range can be self-adapted closer to the true range by multi-scale transform. The simulative autocorrelation functions(ACFs) of unimodal size distribution particles of 200~600 nm and bimodal siz...
脉冲功率技术
High power graphite two-electrode spark gap switch
guo liangfu, li li, lai guiyou, lin fuchang, chen dehuai, li yizheng, li dongmei, luan yongping
2010, 22.
Abstract:
Two-electrode spark gap switch is an important candidate for the switching element of huge high laser power supply systems. This paper presents the using condition and critical technology of graphite two-electrode spark gap switch. The electrical fie...
Optimization design of electromagnetic field of multigap gas switch
wu hanyu, cong peitian, guo ning, sun tieping, zhang guowei
2010, 22.
Abstract:
Three different electrode configurations of multigap switches, ellipse-ellipse, arc-ellipse and arc-arc types, are designed. And the simulation of electric field and the static experiment of the switches are conducted. The result shows that, the fiel...
Design of spiral pulse-forming line with high voltage and μs long pulse width
fang jinyong, jiang weihua, zhang zhiqiang, huang wenhua
2010, 22.
Abstract:
The design proposal of spiral pulse-forming line with high voltage and μs pulse width is presented, and the spiral structure is firstly used for the generator with μs-long pulse width and high output voltage. The inner conductor of the pulse-forming ...
Effect of magnetizing inductance on pulse waveform drop of linear transformer driver
wang ganping, tan jie, xiang fei, luo min, kang qiang, cao shaoyun, zhang yonghui, gong shenggang, luo guangyao, zhang beizhen, li chunxia
2010, 22.
Abstract:
Based on the experimental device of the linear transformer driver, the effect of magnetizing inductance on the pulse waveform drop is theoretically and simulatively studied in this paper. The formulae are deduced, with which the effect of magnetizing...
Compact high-voltage pulse transformer with closed magnetic core
zhang yu, liu jinliang, cheng xinbing, zhang hongbo, bai guoqiang
2010, 22.
Abstract:
A compact 200 kV pulse transformer with step-up ratio of 109 was developed to miniaturize high-voltage pulse transformer. Researches on coupling, high-voltage insulation and output characteristics of the transformer were carried out by electromagneti...
Recognition of NEMP and LEMP signals based on auto-regression model and artificial neutral network
li peng, song lijun, han chao, zheng yi, cao baofeng, li xiaoqiang, zhang xueqin, liang rui
2010, 22.
Abstract:
Auto-regression (AR) model, one power spectrum estimation method of stationary random signals, and artifical neutral network were adopted to recognize nuclear and lightning electromagnetic pulses. Self-correlation function and Burg algorithms were us...
Spot size measurement for pulsed X-ray source with lamination method
gao yi, ma jiming, zhang zhong, zhang pengfei, sun jiang, wang zhiguo, yin jiahui, liang tianxue, du taibin
2010, 22.
Abstract:
The principle of pulsed X-ray spot size measurement with lamination method was presented. The spatial resolution and output response for uniformly distributed line source of the metal-film lamination were calculated numerically. The corresponding rel...
综述
Spray cooling technology for high-power solid-state laser
si chunqiang, shao shuangquan, tian changqing, xu hongbo
2010, 22.
Abstract:
As an efficient cooling method for high power lasers, spray cooling gets more and more attentions. The progress in spray cooling technology is reviewed. Emphasis is placed on the heat transfer mechanism, the influencing factors of heat transfer capab...
高功率激光与光学
Effect of diffuser inlet area ratio on free-vortex aerodynamic window performance
liu shengtian, guo jianzeng, liu qi, chen liang, li jinxue
2010, 22.
Abstract:
The effects of diffuser inlet area ratio on pressure recovery and sealing capability of free-vortex aerodynamic window were investigated experimentally based on active diffuser. The results show that the diffuser inlet area ratio is an important fact...
Modeling of atmospheric turbulence in surface layer over desert based on meteorological parameters
hu yuehong, qiang xiwen, feng jianwei, zhang zhigang, han yan, zong fei, li yan
2010, 22.
Abstract:
A numerical model of atmospheric turbulence in surface layer over desert is presented. Through measuring meteorological parameters including temperature, humidity, pressure and wind speed, atmospheric turbulence strength in the surface layer can be o...
Coherent beam combination of fiber laser array with multi-dithering
ma yanxing, wang xiaolin, zhou pu, ma haotong, zhao haichuan, xu xiaojun, si lei, liu zejin, zhao yijun
2010, 22.
Abstract:
Coherent beam combining of four fiber laser beams with multi-dithering based on field programmable gate array(FPGA) control module was demonstrated. When the phase control system is in close loop, the phase errors between the beams induced by atmosph...
Application of wavelet analysis to laser Doppler signal processing
zhou jian, long xingwu
2010, 22.
Abstract:
An idea of using laser Doppler velocimeter(LDV) to offer the velocity in vehicle inertial navigation system was proposed. The principles of measuring its own velocity of laser Doppler and relative theory of wavelet transform were expounded. Doppler s...
Coherent and incoherent combinations of radial array elliptical Gaussian beams beyond paraxial approximation
li changjin
2010, 22.
Abstract:
Starting from the Rayleigh-Sommerfeld diffraction integral, analytical expressions for the free-space propagation of radial array nonparaxial elliptical Gaussian beams in coherent and incoherent combinations are derived, and some special cases includ...
Integrating current transformer calibration for charge measurement of electron beam generated in laser wakefield acceleration
dong kegong, zhu bin, wu yuchi, su chunxiao, yu ruizhen, gu yuqiu, wang xiaofang
2010, 22.
Abstract:
This paper presents the calibration of the input-output characteristic of integrating current transformer (ICT) by digital signal generation and oscilloscope, gives the ratio of input and output of the calibrated ICT under different input pulse durat...
Numerical simulation of impulse coupling to aluminum target in laser ablation in vacuum
yuan hong, tong huifeng, sun chengwei, zhao jianheng, li mu
2010, 22.
Abstract:
Analyzing the interaction mechanism of laser with target and vaporized target material, a one-dimensional bulk absorption model to simulate the solid target ablated directly by the laser beam is presented, numerical calculation of impulse acting on t...
Influence of chirp match and synchronization jitter on optical parametric chirped pulse amplification
li xianhua, zeng shuguang, zhang bin, sun nianchun, sui zhan
2010, 22.
Abstract:
In the process of optical parametric chirped pulse amplification, a chirp matching method for signal-and-pump synchronization has been established by studying the variation of conversion efficiency with pump pulse chirped parameters and the correspon...
Electrical response of PC-type HgCdTe detector under out-band 10.6 μm laser irradiation
he yuanxing, jiang houman
2010, 22.
Abstract:
A 1-D energy balance model is used to describe the electrical responses of photoconductor (PC)-type HgCdTe detector under out-band 10.6 μm laser irradiation. The simulated resistance-vs-time curve agrees with the experimental curve in terms of curvil...
Influence of optical window shape on aero-optic effects
zhang li, liu guodong, wang guibing
2010, 22.
Abstract:
This paper studies the optical aberrations in the case when the optical beam is propagating through the flow field of two optical windows with different shapes, respectively. The flow field is governed by the the 3-D Reynolds averaged Navier-Stokes (...
Pang Miao, Yuan Xuewen, Gao Xueyan
measurement system for laser intensity distribution based on diffused transmission imaging
2010, 22.
Abstract:
CCD diffused transmission imaging method is used to measure laser intensity distribution and power. The measurement principle of the design is presented. The designed system’s configuration is summarized. There are particular introduction for each pa...
Multi-objective star calibration study of total atmospheric transmittance measurement with stellar irradiance
zhu ming, zhan jie
2010, 22.
Abstract:
The Langley-Plot calibration principles and measurement apparatus of total atmospheric transmittance were introduced. The multi-objective star calibration of total atmospheric transmittance measurements with stellar irradiance is presented, and calib...
Effect of tangential airflow on resin composite irradiated by laser
chen minsun, jiang houman, liu zejin
2010, 22.
Abstract:
In order to understand the influence of the tangential airflow on the thermal response of resin composite irradiated by laser, the convective heat transfer coefficient and the blanketing effect are studied by the heat transfer theory of boundary laye...
加速器技术
Precise beam current measurement for storage ring using beam position monitor
leng yongbin, yan yingbing, zhou weimin, yuan renxian
2010, 22.
Abstract:
Beam position monitor (BPM), as the most popular component in beam instrumentation system of particle accelerator, carrying not only beam position information but also other information like beam charge, is suitable for multi parameters diagnostics. ...
Photon beam position measurement system based on four-quadrant detector
gu liming, sun baogen, shen chaobo, lu ping, wang jigang, wang xiaohui, tang leilei, xiao yunyun
2010, 22.
Abstract:
In order to overcome the limitation that the two-wire monitor cannot measure the beam position in vertical and horizontal directions at the same time, a new photon beam position measurement system based on four-quadrant detector has been developed at...
Optical characteristics of gas switch and vacuum diode of high power pulse modulator
yin yi, zhong huihuang, yang zhilong, yang jie, liu jinliang, zhang jun
2010, 22.
Abstract:
Gas switch and vacuum diode are important parts of high power pulse modulator; the measurements of their characteristic parameters are focused on voltage and current. In this paper, using the photodiode and optic fiber, the optical characteristic par...
高功率微波
Behavioral response and cell morphology changes of Caenorhabditis elegans under high power millimeter wave irradiation
ren changhong, yuan guangjiang, gao yan, wu yonghong, xu zhiwei, xu shouxi, su yinong, liu pukun, zhang chenggang
2010, 22.
Abstract:
C. elegans were exposed to high power millimeter waves(MMWs) with different mean power densities, to investigate their behavioral response and cell morphology changes under MMW irradiation. The time-course photomicrography system was used to record t...
Radiation characteristics of high powe mesoband patch antenna array
xu gang, liao yong, xie ping, meng fanbao, tang chuanxiang
2010, 22.
Abstract:
To enhance the total power capability and gain of the high power mesoband electromagnetic pulse radiator, the study of a high power mesoband patch antenna array was conducted, including analysis of antenna elements, mutual coupling analysis, design o...
Jiggle particle swarm optimization algorithm for multi-parameter optimization of Egun
fan junjie, zhang zhaochuan
2010, 22.
Abstract:
A jiggle particle swarm optimization (JPSO) algorithm has been adopted for multi-parameter optimization of 2D electro-optical problems. Given the target track of electron trajectory and scope of optimization, it can find rotating axisymmetric vacuum ...
Intense electron emission of SiC nanowires cathode used in high power microwave
chen zhongdao, bai shuxin, li gongyi, li xiaodong, wan hong
2010, 22.
Abstract:
Experimental study on the electron emission of silicon carbide nanowires cathode samples fabricated by the pyrolysis of polycarbosilane at 1 200 ℃ was carried out. The results show that the silicon carbide nanowires cathode has higher electron emissi...
3-D simulation of S-band wide-gap klystron amplifier output cavity
bai xianchen, zhang jiande, yang jianhua
2010, 22.
Abstract:
High frequency characteristics analysis is presented on a washer loaded wide-gap reentrant output cavity for the S-band relativistic wide-gap klystron amplifier(WKA). At resonant frequency points, the electric field modes of the wide-gap output cavit...
Numerical simulation on coupling effects of ultra wide band electromagnetic pulse into slots in a cavity
xiao jinshi, liu wenhua, zhang shiying, zhang jinhua
2010, 22.
Abstract:
Aperture coupling is a main coupling mode through which ultra wide band(UWB) electromagnetic pulse(EMP) can disturb or damage many equipments. Coupling effects of slots with different shapes in a cuboid object are studied using finite difference in t...
Focusing and transport of sheet electron beams
han ying, ruan cunjun, wang yong, zhao ding
2010, 22.
Abstract:
Sheet electron beams can transport stably in periodically cusped magnetic fields(PCMs). Two-plane focusing and edge focusing of the sheet beams with rectangular cross section of finite width are investigated using single-particle model. Theoretical a...