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RSS2008 Vol. 20, No. 01
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2008,
20.
Abstract:
A simple concept is applied to the construction of a Bessel-Gauss resonator based on an axicon with a plane output mirror. Fox-Li algorithm and numerical integral are applied respectively to describe the radical amplitude at output mirror and the thr...
A simple concept is applied to the construction of a Bessel-Gauss resonator based on an axicon with a plane output mirror. Fox-Li algorithm and numerical integral are applied respectively to describe the radical amplitude at output mirror and the thr...
2008,
20.
Abstract:
The algorithm of retrieving cloud height was studied. The intensity and the pulse width of the cloud backscatter is different from the atmospheric aerosol and the random noise. The cloud height could be determined by analyzing lidar returns. A select...
The algorithm of retrieving cloud height was studied. The intensity and the pulse width of the cloud backscatter is different from the atmospheric aerosol and the random noise. The cloud height could be determined by analyzing lidar returns. A select...
2008,
20.
Abstract:
In this paper, the damage modes of the carbon fiber and the glass fiber reinforced epoxy or bakelite resin matrix composites irradiated by CW laser under different power densities were analyzed, and the changes of the microstructure and the tensile s...
In this paper, the damage modes of the carbon fiber and the glass fiber reinforced epoxy or bakelite resin matrix composites irradiated by CW laser under different power densities were analyzed, and the changes of the microstructure and the tensile s...
Comparison of several stochastic parallel optimization control algorithms for adaptive optics system
2008,
20.
Abstract:
Optimizing the system performance metric directly is an important method for correcting wave-front distortions in adaptive optics(AO) systems. Appropriate stochastic parallel optimization control algorithm is the key to correcting distorted wave fron...
Optimizing the system performance metric directly is an important method for correcting wave-front distortions in adaptive optics(AO) systems. Appropriate stochastic parallel optimization control algorithm is the key to correcting distorted wave fron...
2008,
20.
Abstract:
Pyrotechnic explosion pumping method is one of the solutions to make miniature and portable laser. A chemical reagent used to pump Nd glass laser was prepared. The main ingredients of the reagent were metal powders and alkali metals’ oxysalts. The ex...
Pyrotechnic explosion pumping method is one of the solutions to make miniature and portable laser. A chemical reagent used to pump Nd glass laser was prepared. The main ingredients of the reagent were metal powders and alkali metals’ oxysalts. The ex...
2008,
20.
Abstract:
In order to investigate the tribological performance of laser clad coating about die steel, laser cladding techniques were adopted with Fe alloy powders. Tests were carried out using laser clad layers as upper samples and GCr15 steel as lower samples...
In order to investigate the tribological performance of laser clad coating about die steel, laser cladding techniques were adopted with Fe alloy powders. Tests were carried out using laser clad layers as upper samples and GCr15 steel as lower samples...
2008,
20.
Abstract:
Using the local moment invariants based on edge region as the recognition feature and building multiple neural networks, a novel method for partially occluded extended target recognition is presented. First, the local moment invariants are calculated...
Using the local moment invariants based on edge region as the recognition feature and building multiple neural networks, a novel method for partially occluded extended target recognition is presented. First, the local moment invariants are calculated...
2008,
20.
Abstract:
The thermal ablation rate and mass ablation rate of cured E-51 epoxy under long pulse laser irradiation were studied. The effects of irradiation time, maximum power density, frequency and pulse width were discussed. The thermal ablation rate graduall...
The thermal ablation rate and mass ablation rate of cured E-51 epoxy under long pulse laser irradiation were studied. The effects of irradiation time, maximum power density, frequency and pulse width were discussed. The thermal ablation rate graduall...
2008,
20.
Abstract:
A broadband (white-light) interferometric detection method based on the Michelson interferometer principle was put forward to detect the phasing error between the segmented mirrors, and subsequently correct the misaligned segments correspondingly to ...
A broadband (white-light) interferometric detection method based on the Michelson interferometer principle was put forward to detect the phasing error between the segmented mirrors, and subsequently correct the misaligned segments correspondingly to ...
2008,
20.
Abstract:
On the basis of the calculation result of the simultaneous dual wavelength threshold condition, the reflectivities of reflection mirror were more than 99.73% at 1 318.8 nm and 1 338 nm wavelengths,but about 7% at 1 064 nm; the output mirror was coate...
On the basis of the calculation result of the simultaneous dual wavelength threshold condition, the reflectivities of reflection mirror were more than 99.73% at 1 318.8 nm and 1 338 nm wavelengths,but about 7% at 1 064 nm; the output mirror was coate...
2008,
20.
Abstract:
In the laser engineering system, a beam expander and an annular aperture were taken as the equivalent of the Cassegrain telescope system. The far-field irradiance distribution of an expanded Gaussian beam which had gone through an annular aperture wa...
In the laser engineering system, a beam expander and an annular aperture were taken as the equivalent of the Cassegrain telescope system. The far-field irradiance distribution of an expanded Gaussian beam which had gone through an annular aperture wa...
2008,
20.
Abstract:
Using high resolution radiosonde data from SPARC data center of America, employing the Tatarski formula, this paper compares the refractive index structure constant calculated by the outer scale method with the one by thd method of coupling turbulent...
Using high resolution radiosonde data from SPARC data center of America, employing the Tatarski formula, this paper compares the refractive index structure constant calculated by the outer scale method with the one by thd method of coupling turbulent...
2008,
20.
Abstract:
A kind of hole-net structure can be formed on silicon sample irradiated by pulse laser with power of 0.5 J·s-1·cm-2 and wavelength of 1 064 nm. The photoluminescence(PL) emission is enhanced by the hole-net structure. The PL peak center is about 700 ...
A kind of hole-net structure can be formed on silicon sample irradiated by pulse laser with power of 0.5 J·s-1·cm-2 and wavelength of 1 064 nm. The photoluminescence(PL) emission is enhanced by the hole-net structure. The PL peak center is about 700 ...
2008,
20.
Abstract:
ICF target material areal density and its distribution can be measured by counting beta particles passing through the material. It is necessary to calibrate the areal density measuring device using a series of standard materials with known areal dens...
ICF target material areal density and its distribution can be measured by counting beta particles passing through the material. It is necessary to calibrate the areal density measuring device using a series of standard materials with known areal dens...
2008,
20.
Abstract:
The total cross sections of electron impact single K-shell ionization of atomic targets Al, Ti, Cu and Mo, with a wide range of atomic numbers from 11 to 42, are evaluated in the energy range up to about 1 MeV employing the relativistic correction me...
The total cross sections of electron impact single K-shell ionization of atomic targets Al, Ti, Cu and Mo, with a wide range of atomic numbers from 11 to 42, are evaluated in the energy range up to about 1 MeV employing the relativistic correction me...
2008,
20.
Abstract:
Aperture of gate hole is an important geometry parameter in a Spindt type field emission array(FEA) cathode. During the local oxidation of silicon(LOCOS) process, a SiO2 “bird beak” will form and lead to much smaller holes than the Si3N4 dot patterne...
Aperture of gate hole is an important geometry parameter in a Spindt type field emission array(FEA) cathode. During the local oxidation of silicon(LOCOS) process, a SiO2 “bird beak” will form and lead to much smaller holes than the Si3N4 dot patterne...
2008,
20.
Abstract:
The transmission characteristics of relativistic electron beams in the ion-focusing channel is given in this paper utilizing the single-particle theory, and the effects of the system parameters such as the ion-electron density ratio, the beam voltage...
The transmission characteristics of relativistic electron beams in the ion-focusing channel is given in this paper utilizing the single-particle theory, and the effects of the system parameters such as the ion-electron density ratio, the beam voltage...
2008,
20.
Abstract:
In order to prepare nitrogen-doped TiO2 film in the surface of SiO2 glass, Ti ion implantation was performed at room temperature in fused silica and then the as-implanted samples were annealed in nitrogen ambient up to 900 ℃. SRIM code and Rutherford...
In order to prepare nitrogen-doped TiO2 film in the surface of SiO2 glass, Ti ion implantation was performed at room temperature in fused silica and then the as-implanted samples were annealed in nitrogen ambient up to 900 ℃. SRIM code and Rutherford...
2008,
20.
Abstract:
Al films on quartz wafers were fabricated by DC magnetron sputtering. Surface roughness, crystal structure, stress stress,preferred orientation and reflectivity of Al films were studied by different annealing temperature. The AFM images show that the...
Al films on quartz wafers were fabricated by DC magnetron sputtering. Surface roughness, crystal structure, stress stress,preferred orientation and reflectivity of Al films were studied by different annealing temperature. The AFM images show that the...
2008,
20.
Abstract:
This paper analyzes the characteristics of the front rising electromagnetic pulse and introduces the basic theory of transmission line method used to analyze shielding effectiveness of rectangular cavity. The basic formulas are then revised to calcul...
This paper analyzes the characteristics of the front rising electromagnetic pulse and introduces the basic theory of transmission line method used to analyze shielding effectiveness of rectangular cavity. The basic formulas are then revised to calcul...
2008,
20.
Abstract:
A 10-stage wave erection Marx generator with coaxial structure is designed, which realizes the miniaturization of pulse power modulator with capacitance energy storage. Low-inductance capacitors of 3 nF are chosen as energy storage capacitors, and so...
A 10-stage wave erection Marx generator with coaxial structure is designed, which realizes the miniaturization of pulse power modulator with capacitance energy storage. Low-inductance capacitors of 3 nF are chosen as energy storage capacitors, and so...
2008,
20.
Abstract:
Photoconductive semiconductor switches (PCSS) have been used in pulsed power technology due to their advantages over conventional switches, such as fast rise time, negligible time jitter, and optical electrical isolation. History and developments of ...
Photoconductive semiconductor switches (PCSS) have been used in pulsed power technology due to their advantages over conventional switches, such as fast rise time, negligible time jitter, and optical electrical isolation. History and developments of ...
2008,
20.
Abstract:
A simple sol-gel method was applied to prepare high refractive index thin film used in antilaser optical area. The method composed of two steps employing a complete hydrolysis and a restrained polycondensation at low temperature. The morphology of th...
A simple sol-gel method was applied to prepare high refractive index thin film used in antilaser optical area. The method composed of two steps employing a complete hydrolysis and a restrained polycondensation at low temperature. The morphology of th...
2008,
20.
Abstract:
This paper studies the excitation of the stimulated Raman backscatter of ultrashort and ultrahigh intensity laser pulse. Through one dimentional particle-in-cell code LPIC++, it is found that in the relativitic condition, the stimulated Raman backsca...
This paper studies the excitation of the stimulated Raman backscatter of ultrashort and ultrahigh intensity laser pulse. Through one dimentional particle-in-cell code LPIC++, it is found that in the relativitic condition, the stimulated Raman backsca...
2008,
20.
Abstract:
Coupled-wave equations and conversion efficient theory formulas for second harmonic plane wave of type Ⅰ phase matching in uniaxial crystals were obtained from wave equation of medium when second-harmonic wave absorption was taken into account. Based...
Coupled-wave equations and conversion efficient theory formulas for second harmonic plane wave of type Ⅰ phase matching in uniaxial crystals were obtained from wave equation of medium when second-harmonic wave absorption was taken into account. Based...
2008,
20.
Abstract:
Monolithic tantalic oxide aerogels were synthesized from inorganic salt precursors, tantalic pentachloride by hydrolysis and condensation in alcohol solvent. The propylene oxide and the epichlorohydrin were used as gelling agent respectively. The tan...
Monolithic tantalic oxide aerogels were synthesized from inorganic salt precursors, tantalic pentachloride by hydrolysis and condensation in alcohol solvent. The propylene oxide and the epichlorohydrin were used as gelling agent respectively. The tan...
2008,
20.
Abstract:
Experimental study of characteristics of laser induced damage on the K9 glass surface, irradiated by Nd:YAG laser operating at 1.064 μm wavelength and approximately 10 ns pulse duration and 1 Hz repetition rate, have been made. The change law of lase...
Experimental study of characteristics of laser induced damage on the K9 glass surface, irradiated by Nd:YAG laser operating at 1.064 μm wavelength and approximately 10 ns pulse duration and 1 Hz repetition rate, have been made. The change law of lase...
2008,
20.
Abstract:
Mo/B4C multilayer is a suitable material combination for high reflectivity mirrors in the soft X-ray wavelength region of 6.7~8.0 nm. The structures of the ideal Mo/B4C multilayer mirrors optimized based on the General Algorithm method (GA) are that ...
Mo/B4C multilayer is a suitable material combination for high reflectivity mirrors in the soft X-ray wavelength region of 6.7~8.0 nm. The structures of the ideal Mo/B4C multilayer mirrors optimized based on the General Algorithm method (GA) are that ...
2008,
20.
Abstract:
In the Sino-Russian joint Z-pinch experiments on Angara-5-1 facility, the framing camera with an exposure time of several 10 picosecond was employed. By setting different kinds of filters of various thickness values before the pinholes of camera and ...
In the Sino-Russian joint Z-pinch experiments on Angara-5-1 facility, the framing camera with an exposure time of several 10 picosecond was employed. By setting different kinds of filters of various thickness values before the pinholes of camera and ...
2008,
20.
Abstract:
The design of double-gap output cavity for relativistic klystron amplifier is provided. The angle and position of support rods and gap length are described. Using a three-dimension fully electromagnetic Particle-in-Cell (PIC) code, the simulation of ...
The design of double-gap output cavity for relativistic klystron amplifier is provided. The angle and position of support rods and gap length are described. Using a three-dimension fully electromagnetic Particle-in-Cell (PIC) code, the simulation of ...
2008,
20.
Abstract:
A new method to measure the aberrations of entire beam path is presented. An additional CCD in far-field for detecting focal spot is located. Different deformable mirror’s surface shapes are generated which can bring additional aberrations to ICF opt...
A new method to measure the aberrations of entire beam path is presented. An additional CCD in far-field for detecting focal spot is located. Different deformable mirror’s surface shapes are generated which can bring additional aberrations to ICF opt...
2008,
20.
Abstract:
Based on the measured values on the axis of the magnetic system of the traveling wave tube(TWT), an axis-symmetrical equivalent model of magnetic ring, whose volume is equal to that of the practical non-axis-symmetrical magnetic ring with a gap, is p...
Based on the measured values on the axis of the magnetic system of the traveling wave tube(TWT), an axis-symmetrical equivalent model of magnetic ring, whose volume is equal to that of the practical non-axis-symmetrical magnetic ring with a gap, is p...
2008,
20.
Abstract:
The motion of the electron in the conversion region has been analysed. The equations of the electron motion are given and calculated. The effects of the beam radius, the initial energy ratio, the length of the conversion region and the magnetic field...
The motion of the electron in the conversion region has been analysed. The equations of the electron motion are given and calculated. The effects of the beam radius, the initial energy ratio, the length of the conversion region and the magnetic field...
2008,
20.
Abstract:
Based on the angular periodicity of the helix slow-wave structure, an improved simulation method for simulating the high frequency characteristic is proposed using the boundary condition of Master/Slave in the commercial software HFSS. The simulation...
Based on the angular periodicity of the helix slow-wave structure, an improved simulation method for simulating the high frequency characteristic is proposed using the boundary condition of Master/Slave in the commercial software HFSS. The simulation...
2008,
20.
Abstract:
The accurate three dimensional helix travlingwave tube coldtest simulation model is presented using the electromagnetic code HFSS. For electric field in the perturbation rod, four prominent approximations of perturbation method are analyzed with th...
The accurate three dimensional helix travlingwave tube coldtest simulation model is presented using the electromagnetic code HFSS. For electric field in the perturbation rod, four prominent approximations of perturbation method are analyzed with th...
2008,
20.
Abstract:
S-band tapered magnetically insulated transmission line oscillator designs using slowly tapered vanes and sharply tapered vanes were presented and analyzed. Simulation results show that: this structure can produce microwave at mean power of 2.5 GW an...
S-band tapered magnetically insulated transmission line oscillator designs using slowly tapered vanes and sharply tapered vanes were presented and analyzed. Simulation results show that: this structure can produce microwave at mean power of 2.5 GW an...
2008,
20.
Abstract:
Based on the general coupled wave equations in corrugated circular waveguide with trapered radius, this paper presents the numerical optimization method Runge-Kutta to get the design parameters of 3 mm TE03-TE02 and TE02-TE01 high efficiency mode con...
Based on the general coupled wave equations in corrugated circular waveguide with trapered radius, this paper presents the numerical optimization method Runge-Kutta to get the design parameters of 3 mm TE03-TE02 and TE02-TE01 high efficiency mode con...
2008,
20.
Abstract:
Shanghai synchrotron radiation facility (SSRF) is a third-generation light source under construction. It requires high level of electron beam orbit stability. Mechanical stability of the magnet girder assemblies (MGAs) is essential for electron beam ...
Shanghai synchrotron radiation facility (SSRF) is a third-generation light source under construction. It requires high level of electron beam orbit stability. Mechanical stability of the magnet girder assemblies (MGAs) is essential for electron beam ...
2008,
20.
Abstract:
The transverse bunch-by-bunch feedback system has been constructed at Hefei light source to cure and damp the coupled bunch instability. There are two important modules in the system: the vector calculation module and the notch filter. The vector cal...
The transverse bunch-by-bunch feedback system has been constructed at Hefei light source to cure and damp the coupled bunch instability. There are two important modules in the system: the vector calculation module and the notch filter. The vector cal...
2008,
20.
Abstract:
The main part of the 100 MeV electron linac consists of a thermionic electron gun, a bunching system and 4 SLAC type accelerating tubes. The bunching system and the accelerating tubes are fed by a 45 MW S-band microwave power source. The beam dynamic...
The main part of the 100 MeV electron linac consists of a thermionic electron gun, a bunching system and 4 SLAC type accelerating tubes. The bunching system and the accelerating tubes are fed by a 45 MW S-band microwave power source. The beam dynamic...
