2010 Vol. 22, No. 10

Recommend Articles
脉冲功率技术
Numerical simulation of vacuum surface flashover under applied magnetic field
liu yu, deng jianjun, wang meng, zou wenkang, zhou liangji
2010, 22.
Abstract:
The influence of applied magnetic field on the process of vacuum flashover, especially on electric field-induced secondary electron emission and electron avalanche, has been investigated by a Monte-Carlo code based on single particle model. It is fou...
Miniature MA-level helical explosively-driven magnetic flux compression generator
li xiaolin, chen dongqun, li da, cao shengguang, wang yuwei, li shu
2010, 22.
Abstract:
The parameters of miniature MA-level helical explosively-driven magnetic flux compression generator(HEMCG) are calculated by method of equivalent circuit,and the result indicates that the main loss of HEMCG is non-Ohmic loss.The entire outer diameter...
Application of high rep-rate linear transformer to long pulse high power generator
xiang fei, tan jie, wang ganping, luo min, cao shaoyun, kang qiang
2010, 22.
Abstract:
The realization technique of modularization on the long pulse high power generator was expounded. The energy efficiency was analyzed. The main influence factors on the wave distortion from the primary pulse to the system output waveforms were discuss...
Influencing factors of life of high power linear xenon-filled flash lamp
ma yongbo, peng shuming, long xinggui, fu xuemei, cao qingwei, yang benfu, yan dengyun
2010, 22.
Abstract:
This paper analyzes the factors influencing the failures of high power linear xenon-filled flash lamps in NOVA, NIF and Shenguang-Ⅲ. The factors include the correlations between the stress and flash lamp explosion, the correlation between lifetime an...
Long pulse generator based on thin spiral line
pan yafeng, peng jianchang, song xiaoxin, su jiancang, wang liming
2010, 22.
Abstract:
A spiral pulse forming line was presented, which consisted of inner cylinder and outer cylinder, and was densely wound by thin lines with multiple origins. Combining it with Tesla transformer, a compact long pulse generator was constructed, which had...
Physical design and simulation of LTD-based source with long pulse and high power
wang ganping, xiang fei, tan jie, luo min, kang qiang, cao shaoyun
2010, 22.
Abstract:
A linear transformer driver (LTD) module with 150 kV output capability was designed based on a former 125 kV LTD module, which used Blumlein line as the pulse forming line. A 600 kV LTD system was contrived with four newly designed modules connected ...
Experimental study of unstable resonator for high-power TEA CO2 laser
yang guilong, shao chunlei, guo ruhai, meng fanjiang, li dianjun, guo lihong, guo jin
2010, 22.
Abstract:
The experiments of unstable resonator were performed for compressing divergence angle through modifying a high-power stable resonator TEA CO2 laser. The virtual confocal positive branch was adopted to study the influences of structure parameters and ...
Calibrating method of high voltage and current probe for fast pulse measurements
lai dingguo, zhang yongmin, xie linshen, yao weibo, qiu aici, huang jianjun, ren shuqing, yang li
2010, 22.
Abstract:
A calibrating method of high voltage and current probe for fast pulse measurements is presented based on pulse formation principle. A voltage and current generator which used the output line and diode of Flash Ⅱ accelerator as pulse formation line wa...
粒子束技术
Band gap of 3-element 1-D defective mode photonic crystal
zhang ling, liang liang, zhou chao
2010, 22.
Abstract:
The band gap structure of 3-element 1-D photonics crystal with defective mode was studied by transfer matrix method,and the influence of the variation of the defect thickness on band gap structure was analyzed through numerical simulation. The simula...
On-line diagnosis of O and OH radical in atmospheric pressure plasma jet by optical emission spectroscopy
liu zhongwei, chen qiang, wang zhengduo, yang lizhen, li bin, wang chuanyue
2010, 22.
Abstract:
The hydroxyl radical(OH) and oxygen atom(O) play important roles in atmospheric chemistry, surface treatment and chemical decontamination. The present work reports the measurement of OH and O in atmospheric pressure plasma jet by optical emission spe...
Novel method for measuring and correcting dead-time using 252Cf neutron source based autocorrelation function in nuclear radiation detection
wei biao, ren yong, tang yuelin, mi deling, feng peng, jin jing
2010, 22.
Abstract:
To solve the problem of dead time loss, a novel method for measuring and correcting dead-time is proposed with the use of autocorrelation function based on a 252Cf -source-driven spectrum analyzing system. The experiment shows that the dead-time of t...
Effect of negative permeability on negative permittivity in electromagnetic metamaterials
huang yongjun, wen guangjun, li tianqian, xie kang
2010, 22.
Abstract:
For further understanding of the interactions between different materials in the electromagnetic metamaterials, the change characteristics of the effective permittivity of wire array embedded in a single negative permeability medium were analyzed the...
Time-frequency feature analysis and recognition of fission neutrons signal based on support vector machine
jin jing, wei biao, feng peng, tang yuelin, zhou mi
2010, 22.
Abstract:
Based on the interdependent relationship between fission neutrons(252Cf)) and fission chain((235U system), the paper presents the time-frequency feature analysis and recognition in fission neutron signal based on support vector machine(SVM) through t...
Pinhole imaging using CdZnTe detector for high-energy gamma source
wang xi, xiao shali, zhang liuqiang, cao yulin, chen yuxiao, li miao, shen min
2010, 22.
Abstract:
Based on a new room-temperature CdZnTe detector, the energy spectrum of each pixel and the image of the 662 keV 137Cs source have been obtained with a thick pinhole system. According to penetration and scattering effect of the high energy photons in ...
Influence of scattering α particle on time spectra in explosive detection
he tie, chen yuan, an li, guo haiping, zheng pu, wang xinhua
2010, 22.
Abstract:
The resolution of time spectrum is an important factor to obtain the excellent prompt gamma spectrum in the explosive detection. In this paper, we consider the scattering of α particle in the D-T reaction chamber wall is the main reason to the resolu...
加速器技术
Single-shock compression limit of low-Z fluids
he yiguang, wang zhao, tang xiuzhang
2010, 22.
Abstract:
Compression limit of low-Z fluid is the most important criterion of theoretical and experimental study of equations-of-state at high pressure. Virial theorem and Hugoniot equation show that the shock compression ratio is decided by the excitation deg...
Status of 40 kW solid state amplifier development at Hefei Light Source
huang guirong, chu chen, jin kai, wang jinxiang, jia dachun, he zheng, sun yonghui, li yunmin
2010, 22.
Abstract:
A 40 kW, 204 MHz solid state RF amplifier is being developed for the 800 MeV electron storage ring at Hefei Light Source. The solid state amplifier is composed of 130 amplifier units combined by three-stage combiners in two towers. Some prototypes of...
Development of pulsed wire field integral measurement system
wang tao, jia qika
2010, 22.
Abstract:
The theory and the devices of the pulsed wire magnetic measurement system are described. The effects on the measurement accuracy of wire gravity, noise and reflected signal are theoretically analyzed. Some methods such as symmetric wire mounting, nig...
Propagation of intense relativistic sheet electron beam in periodic cusped magnetic fields
du guangxing, qian baoliang
2010, 22.
Abstract:
The propagation of a relativistic (300 keV) sheet electron beam carrying high current (3 kA) through the offset-pole periodic cusped magnetic fields with low amplitude (0.173 T) and short period (20 mm) has been investigated theoretically and numeric...
Betatron tune measurement system for Shanghai Synchrotron Radiation Facility storage ring
leng yongbin, yan yingbing, yuan renxian, zhou weimin
2010, 22.
Abstract:
This paper presents the status of various tune measurement techniques, and describes the beam spectra analysis method based on turn-by-turn beam position data. The physical requirements, hardware layout and key modules of the betatron tune monitor sy...
高功率微波
Bi-directional coupler based on composite right/left-handed and artificial transmission lines
li yunong, liu changjun
2010, 22.
Abstract:
An artificial transmission line as a right-handed transmission line is edge-coupled with a CRLH-TL to realize coupling between the left-handed and the right-handed transmission line. The directional coupler is a compact planar structure with characte...
Spatial power-combination based on parabolic antenna array
chen xin, yu chuan, pan wenwu, cao xiaoyang, zhang shengshuai
2010, 22.
Abstract:
The spatial power-combination, adopting parabolic antennas as the array cells, has been studied, considering the relation between the spatial power-combination efficiency and the amplitude error and phase error of antenna cells. The results of numeri...
Emission characteristics of several field emission cathode materials
bai xianchen, yang jianhua, zhang jiande, ren heming
2010, 22.
Abstract:
The comparative studies by using a tri-cathode accelerator are presented on the cathode emission capability, relative emission delay and emission-time jitter of several common cathode materials, that is, stainless-steel, brass, aluminum, velvet and g...
Design and characteristics of C-band resonant relativistic backward-wave oscillator
zhang jun, jin zhenxing, zhong huihuang, shu ting, zhou shengyue
2010, 22.
Abstract:
A C-band resonant relativistic backward-wave oscillator(RBWO) is designed, and its structure feature and operation mechanism are analyzed. Operation characteristics of the designed device were investigated by particle-in-cell(PIC) simulation. Simulat...
Effect of cascaded mushroom-like EBG structure on multual coupling of dual-band microstrip antenna
chen xi, liang changhong, liu songhua, liang le
2010, 22.
Abstract:
A uniform mushroom-like electromagnetic band-gap (EBG) structure can realize only one surface-wave suppression bandgap. Hence, two kinds of units with different parameters mushroom-like EBG structures are cascaded to realize the dual-band or broadban...
Optimal design and experiment on high power wideband patch antenna
xu gang, liao yong, xie ping, zhang xianfu, meng fanbao, tang chuanxiang
2010, 22.
Abstract:
A 300 MHz-center frequency wideband patch antenna has been developed for high power wideband electromagnetic (EM) pulse radiation, small signal test and high power experiments were performed. The two-layer-patch antenna structure was optimized by Tag...
Observation and analysis of lightning induced overvoltage on buried cables
yu hui, dong wansheng, chen shaodong, wang jianguo, zhang yijun, zhang yang, zhou mi, sun zhen, deqing cuomu
2010, 22.
Abstract:
The experiments have been conducted about lightning electromagnetic pulse (LEMP) coupling to buried cables in the depth of 0.5 m. The test system and the measurement method are both introduced, and the lightning induced overvoltages at the end of the...
Voltage conversion ratio of photoconductive semiconductor switch in microstrip test circuit
sun yunqing, yang hongchun, wu minghe, zeng gang, cui haijuan
2010, 22.
Abstract:
The voltage conversion ratio of the photoconductive semiconductor switch (PCSS) is measured in the microstrip test circuit. The analytical equation of the ratio is deduced according to transmission line theory with the consideration of reflection fro...
Numerical simulation of high power microwave breakdown on dielectric surface at different gas pressures
cai libing, wang jianguo, zhu xiangqin
2010, 22.
Abstract:
This paper presents the electrostatic particle-in-cell (PIC) Monte Carlo collisions (MCC) method for simulating the breakdown on dielectric surface illuminated by high-power microwaves, and the dielectric surface breakdown at different pressures in a...
T-junction high power microwave power combiner
zhang qiang, yuan chengwei, liu lie
2010, 22.
Abstract:
A novel power combiner applied to high power microwave is described and analyzed. It consists of two overmoded rectangular waveguides which are connected vertically, and several metal plates are inserted vertically with the polarization direction of ...
ICF与激光等离子体
Discharge characteristics of SF6/C2H6 working mixture in electric-initiated pulsed HF laser
huang ke, yi aiping, yu li, huang chao, zhu feng, tang ying, liu jingru, ye xisheng
2010, 22.
Abstract:
Typical spatial distribution of the discharge plasma fluorescence and temporal evolutions of the discharge current and voltage in SF6/C2H6 mixture have been measured, which serves as the working gas of the discharge-pumped pulsed HF laser. Discharge ...
High precision 3D coordinates location technology for pellet
fan yong, zhang jiacheng, zhou jingbin, tang jun, xiao decheng, wang chuanke, dong jianjun
2010, 22.
Abstract:
In inertial confinement fusion (ICF) system, manual way has been used to collimate the pellet traditionally, which is time-consuming and low-level automated. A new method based on Binocular Vision is proposed, which can place the prospecting apparatu...
Application of spherically bent crystals spectrometer to X-ray diagnosis
liu lifeng, xiao shali, wang hongjian, shi jun, liu shenye, wei minxi, chen bolun, qian jiayu
2010, 22.
Abstract:
In order to diagnose X-ray emitted from the plasma, a spherically bent crystals spectrometer was developed based on the X-ray Bragg diffraction theory. In the experiment, the dispersive element of crystal analyzer was quartz, the bent radius was 250 ...
Nanosecond-pulsed atmospheric pressure glow discharge plasma and its applications
wan jun, jia xianghong, song mingwei, wang shouguo
2010, 22.
Abstract:
A nanosecond pulsed high voltage power based on semiconductor opening switch was employed to generate atmospheric pressure glow air plasma between a high voltage needle-array electrode and a grounded plate electrode. The discharge volume was 1 600 mm...
Effects of gel particle properties on fabrication process of hollow glass microspheres in drop-tower furnace by dried gel method
qi xiaobo, wei sheng, zhang zhanwen, chen sufen, li bo
2010, 22.
Abstract:
To fabricate high quality hollow glass microsphere (HGM) for inertial confinement fusion targets by dried gel method, effects of gel particle diameter, specific heat, blowing agent concentration and thermal radiation absorption coefficient on the tra...
Thermodynamic properties of LiX(X=H, D, T) system investigated by density-functional theory
lei jiehong, xing pifeng, tang yongjian, zhang yunjuan
2010, 22.
Abstract:
Some thermodynamic functions, mechanics and spectroscopic properties for LiX(X=H,D,T) were calculated with ab initio method. The vibration energy and vibration entropy for solid Li were calculated based on the quasi-harmonic Debye’s theory. The chang...
Influence of polyvinylpyrrolidone with different molecular weight on silver nanoconfiguration in polyol process
yi zao, li kai, niu gao, luo jiangshan, chen shanjun, yi yougen, tang yongjian
2010, 22.
Abstract:
This paper researches the influence of different molecular weight polyvinylpyrrolidone on silver nanoconfiguration in polyol process. The silver nanoparticles are characterized by scanning electron microscopy and X-ray diffraction. Their optical prop...
Laser-induced damage of optical films in vacuum environments
ling xiulan, zhao yuan, li dawei, shao jianda, fan zhengxiu
2010, 22.
Abstract:
Characteristics of laser-induced damage of some optical thin films deposited by e-beam evaporation were investigated in vacuum and atmosphere environments,and the differences of laser-induced damage in two conditions were analyzed and discussed. The ...
Temporal evolution of molecular vibrational temperature in filamentary dielectric barrier discharge in nitrogen at atmospheric pressure
liu xin, xu yong, zhang xiaoguang, wang biyi, li jianfeng, yang xuefeng
2010, 22.
Abstract:
The experiment of filamentary dielectric barrier discharge (DBD) in nitrogen at atmospheric pressure has been studied, in which the needle-plate reactor was employed. The temporal evolution of vibrational temperature of the N2 (C3Πu→B3Πg) molecules w...
Characterization of microstructure and density of polymer foam with X-ray phase contrast computed tomography
gao dangzhong, ma xiaojun, jia peng, ye chenggang
2010, 22.
Abstract:
This paper analyzes the principle and method of X-ray phase contrast imaging technique used to characterize the microstructure of polymer foam. The analytical result shows that the image contrast of low Z polymer foam can be considerably improved wit...
Synthesis and properties of core-shell PS/Ag microspheres
duan tao, tang yongjian, tu hong, luo jiangshan
2010, 22.
Abstract:
Monodisperse polystyrene(PS) microspheres with average sizes of 1.2 to 1.5 μm were obtained by emulsion polymerization. Using PS microspheres as the cores, some PS/Ag core shell particles were prepared after ultrasonic sensitization, deoxidization an...
Numerical simulation of 2D radiation-driven implosion process
yong heng, gao yaoming, qi jin, pei wenbing, zhai chuanlei
2010, 22.
Abstract:
The two-dimensional(2D) three-temperature radiation hydrodynamics code, LARED-H(laser radiation electron dynamic hohlraum), is improved to simulate the 2D radiation-driven implosion process. In order to solve the linear-algebraic equations discretize...
Applications of point-projection radiography to high energy density physics experiment
dong jiaqin, fu sizu, wang wei, xiong jun, jia guo, fang zhiheng
2010, 22.
Abstract:
The principles and characteristics of point-projection radiography were studied through static imaging experiments, using laser-driven about 4.8 keV Ti plasma X-ray source. The application of point-projection to dynamic diagnosis was then developed, ...
Structure and sol-gel process of monolithic TiO2 aerogels
wang xian, bi yutie, ren hongbo, zhang lin
2010, 22.
Abstract:
The sol-gel process and structure of monolithic TiO2 aerogels were experimentally studied. It has been shown that, the increasing of the catalyst and precursor amounts can both lead to shorter gelation time and the hardness improvement of the wet gel...
高功率激光与光学
Variability of clear-air turbulent dissipation rate in troposphere measured by wind profiler
zhang caiyun, weng ningquan
2010, 22.
Abstract:
Using the spectral width from the Airda16000 low stratospheric wind profiler radar, removing the non-turbulent contaminations, then obtaining the spectral width contributed by turbulence, the turbulent dissipation rate could be estimated. The height ...
Coupling of cylindrical high-power laser-diode array end-pumped disk amplifier
deng qinghua, ding lei, he shaobo, fu xuejun, tang jun, xie xudong, lu zhenhua, dong yifang
2010, 22.
Abstract:
A coupling method is put forward for laser-diode array (LDA) end-pumped amplifiers. The LDA is inscribed on a cylindrical surface and then a duct is connected to it. That means the laser diodes are arranged in the shape of an arch. The center of the ...
Numerical study on impulse coupling coefficients of conical nozzle and parabolic nozzle for laser propulsion
li qian, cao zhengrui, jin xing
2010, 22.
Abstract:
A dimensionless factor of conical nozzle is defined combined with incident laser energy, energy deposit efficiency, ambient air pressure, generatrix length and semi-apex angle of nozzle, and it is extended to the study of parabolic nozzle. Effects on...
Parameter optimization system for X-ray in-line phase contrast imaging
cao yudong, qi shuangxi, ye yan, li zeren
2010, 22.
Abstract:
A parameter optimization system is established for X-ray in-line phase contrast imaging of the object of two dimensional Gaussian distribution based on the theoretical analysis of the imaging technology. The dependence of the evaluation parameters in...
Influence of spectrum characteristics on diode pumped alkali laser
yang zining, wang hongyan, lu qisheng, li yuandong, xu xiaojun
2010, 22.
Abstract:
The influence of spectrum characteristics on diode pumped alkali laser has been studied based on the rate equations. The result shows that, there exists an optimal operation temperature for alkali lasers, and the influences of temperature and gain me...
Reconstruction of three-dimensional information in digital micro-holography
wang huaying, zhao baoqun, liao wei, xu hehua
2010, 22.
Abstract:
The reconstruction method of digital holographic phase information based on lateral shearing interferometer was studied and a method to obtain the coefficients of the linear phase aberration was proposed. It is pointed out that one-dimensional phase ...
Investigation of nonlinear characteristics of CS2 with femto-second pulsed Z-scan technique
li hongyu, chang qing
2010, 22.
Abstract:
Nonlinear refraction and absorption properties in carbon disulfide(CS2) have been investigated by Z-scan technique under femtosecond pulse lasers at 800 nm in a broad intensity range. It is found that the Z-scan transmittance curve has a large displa...
Line-imaging velocity interferometer for laser driven flyer diagnostics
liu shouxian, li zeren, peng qixian, chen guanghua, liu jun, meng jianhua, yuan shuyun
2010, 22.
Abstract:
A line-imaging velocity interferometer was developed and implemented, which is used for laser-driven-flyer velocity measurement with high temporal and spatial resolution. Based on VISAR and ORVIS, this system reshapes the probe laser to line light on...
Effect of turbulence inner scale on light-wave temporal spectra
li yan, qiang xiwen, zong fei, zhao junwei, han yan, hu yuehong, feng jianwei
2010, 22.
Abstract:
The temporal spectra of scintillation and angle-of-arrival fluctuations have been studied experimentally for light-waves traveling in turbulence of different inner scales. Because of the complexity and uncontrollability of the real atmosphere, the ex...
External cavity feedback laser diode bar with narrow bandwidth and good beam quality
su zhouping, zhao yanli, lou qihong, zhou jun
2010, 22.
Abstract:
An off-axis external cavity with double feedback is designed to simultaneously reduce spectral bandwidth and improve the beam quality of the laser diode bar. The external cavity is made up of a high-reflection mirror and a blazed grating, where the s...
Intensity distribution in Young’s experiment with partially coherent Hermite-Gaussian beams
wang pu
2010, 22.
Abstract:
Taking the partially coherent Hermite-Gaussian(H-G) beam as a typical example, this paper studies the distribution of diffraction intensity and the visibility of interference fringes in Young’s two-slit set-up illuminated by the multi-mode partially ...
Deployable umbrella-shaped keel concentrator used in solar thermal propulsion system
dai jianfeng, zhao pei, mao genwang, sun yibin, li xing, he chengdan
2010, 22.
Abstract:
A deployable umbrella-shaped keel concentrator has been proposed for the solar thermal thruster (STP) system. The improved concentrator overcomes the shortcomings of traditional inflatable concentrators and rigid fixed concentrators. A deployable sol...
综 述
Research progress in laser induced damage on optical films
li xiaoguang, shen jun
2010, 22.
Abstract:
The mechanism of laser induced damage on optical films, and the methods to improve the laser-induced damage threshold (LIDT) were reviewed in two respects including theory and experiment. We summarized the existing theory models and their applicable ...