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RSS2005 Vol. 17, No. 12
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2005,
17.
Abstract:
A self-adapting FBG (Fiber Bragg grating) dynamic sensor system based on the temperature controlled filter FBG is investigated. Using the semiconductor cooling device the temperature of the FBG filter was controlled, so that the wavelength of the nar...
A self-adapting FBG (Fiber Bragg grating) dynamic sensor system based on the temperature controlled filter FBG is investigated. Using the semiconductor cooling device the temperature of the FBG filter was controlled, so that the wavelength of the nar...
2005,
17.
Abstract:
The AMK-02 ultrasonic measurement meter can measure meteorological and turbulent parameters of the atmosphere. The temperature pulsation sensitivity of the AMK-02 is too low to calculate the refractive-index-structure parameter C2n accurately at the ...
The AMK-02 ultrasonic measurement meter can measure meteorological and turbulent parameters of the atmosphere. The temperature pulsation sensitivity of the AMK-02 is too low to calculate the refractive-index-structure parameter C2n accurately at the ...
2005,
17.
Abstract:
By using the Wigner distribution function(WDF) method, the transformation properties of a Cosine-Gaussian beam in the fractional Fourier transform plane are studied. Closed-form expressions for the intensity distribution and beam widths of Cosine-Gau...
By using the Wigner distribution function(WDF) method, the transformation properties of a Cosine-Gaussian beam in the fractional Fourier transform plane are studied. Closed-form expressions for the intensity distribution and beam widths of Cosine-Gau...
2005,
17.
Abstract:
The lidar technique based on stimulated Raman scattering (SRS) process has been extensively used in monitoring trace gas concentrations in the atmosphere. To monitor the atmospheric CO2 concentration, a nonlinear Raman lidar based on the SRS process ...
The lidar technique based on stimulated Raman scattering (SRS) process has been extensively used in monitoring trace gas concentrations in the atmosphere. To monitor the atmospheric CO2 concentration, a nonlinear Raman lidar based on the SRS process ...
2005,
17.
Abstract:
As a novel pumping scheme, the line focus system applied in the grazing incidence is the on-axis parabola. Using 2D ray-tracing program, the line focus effects with different incidence angle of a Gaussian laser pulse were calculated. As the incidence...
As a novel pumping scheme, the line focus system applied in the grazing incidence is the on-axis parabola. Using 2D ray-tracing program, the line focus effects with different incidence angle of a Gaussian laser pulse were calculated. As the incidence...
2005,
17.
Abstract:
The self-focusing properties of the femtosecond pulse were analyzed through numerical calculation using modified Schr-dinger equation. On the basis of the analysis, the self-focusing properties of the chirped Gaussian pulse in the chirped pulse ampli...
The self-focusing properties of the femtosecond pulse were analyzed through numerical calculation using modified Schr-dinger equation. On the basis of the analysis, the self-focusing properties of the chirped Gaussian pulse in the chirped pulse ampli...
2005,
17.
Abstract:
A method of measuring the atmospheric turbulence based on the arrival angle fluctuation of a focused laser beam backscattering was numerically simulated. Based on the paraxial scalar wave equation and a fractal phase-screen algorithm a simu-lation mo...
A method of measuring the atmospheric turbulence based on the arrival angle fluctuation of a focused laser beam backscattering was numerically simulated. Based on the paraxial scalar wave equation and a fractal phase-screen algorithm a simu-lation mo...
2005,
17.
Abstract:
The effect of third-order nonlinearity on the second harmonic generation of ultrashort pulses in KDP crystal is analyzed theoretically. It is found that the influence of third-order nonlinearity on conversion efficiency becomes dominant when the inci...
The effect of third-order nonlinearity on the second harmonic generation of ultrashort pulses in KDP crystal is analyzed theoretically. It is found that the influence of third-order nonlinearity on conversion efficiency becomes dominant when the inci...
2005,
17.
Abstract:
A secondary-throat diffuser and an 8°diffuser are used respectively on COIL. The performance parameters of the two diffusers are measured and compared. The result indicates that the secondary-throat diffuser may effectively insulate the flow disarran...
A secondary-throat diffuser and an 8°diffuser are used respectively on COIL. The performance parameters of the two diffusers are measured and compared. The result indicates that the secondary-throat diffuser may effectively insulate the flow disarran...
2005,
17.
Abstract:
The characteristics of spectral distribution of harmonic emission are analyzed with a single electron model in the cases of circularly polarized femtosecond laser pulses. It is discovered that the oscillation of electrons will generate harmonic emiss...
The characteristics of spectral distribution of harmonic emission are analyzed with a single electron model in the cases of circularly polarized femtosecond laser pulses. It is discovered that the oscillation of electrons will generate harmonic emiss...
2005,
17.
Abstract:
The technology of XeF(C-A) laser pumped by two counter optical sources is discussed and the photographes of the XeF2 photodissociation waves propagating from two directions are given. The output energy of XeF(C-A) laser is enhanced under two pump sou...
The technology of XeF(C-A) laser pumped by two counter optical sources is discussed and the photographes of the XeF2 photodissociation waves propagating from two directions are given. The output energy of XeF(C-A) laser is enhanced under two pump sou...
2005,
17.
Abstract:
Using a complex analytical signal representation, the free-space propagation properties of ultrashort pulsed Bessel-Gauss beams whose waist width is independent of frequency are studied. It is found that within the diffraction-free range the transver...
Using a complex analytical signal representation, the free-space propagation properties of ultrashort pulsed Bessel-Gauss beams whose waist width is independent of frequency are studied. It is found that within the diffraction-free range the transver...
2005,
17.
Abstract:
HfO2 films were prepared by electron beam evaporation. The residual stress was measured by ZYGO interferometer. The results showed that the residual stresses of HfO2 films were tensile and increased with the increase of deposition temperature firstly...
HfO2 films were prepared by electron beam evaporation. The residual stress was measured by ZYGO interferometer. The results showed that the residual stresses of HfO2 films were tensile and increased with the increase of deposition temperature firstly...
2005,
17.
Abstract:
Using our series codes, quasi-stable Ni-like Ag collisional excitation scheme driven by laser with grazing incidence was studied. Comparing with that with normal incidence, at low drive intensity of 1.2×1013 W·cm-2, the laser energy is mainly deposit...
Using our series codes, quasi-stable Ni-like Ag collisional excitation scheme driven by laser with grazing incidence was studied. Comparing with that with normal incidence, at low drive intensity of 1.2×1013 W·cm-2, the laser energy is mainly deposit...
2005,
17.
Abstract:
The high-order harmonic generation spectrums of He+ irradiated by the two-color coherent laser field are researched by numerically solving the 1-D time-dependent Schr dinger equation using symplectic algorithm. The computational results show that gre...
The high-order harmonic generation spectrums of He+ irradiated by the two-color coherent laser field are researched by numerically solving the 1-D time-dependent Schr dinger equation using symplectic algorithm. The computational results show that gre...
2005,
17.
Abstract:
Copper nano-particles were prepared by flow-levitation method and compacted for 40 min under pressure of 1.5 GPa by cold pressing method . The pressing process was studied well under 25 ℃ and inert gas protection. The relative density and the microha...
Copper nano-particles were prepared by flow-levitation method and compacted for 40 min under pressure of 1.5 GPa by cold pressing method . The pressing process was studied well under 25 ℃ and inert gas protection. The relative density and the microha...
2005,
17.
Abstract:
Big error would be introduced in numerical computation of power spectrum density(PSD) because of the use of the weighted window function. Using simulated single-frequency wavefront, PSD values before and after applying Hanning window were computed an...
Big error would be introduced in numerical computation of power spectrum density(PSD) because of the use of the weighted window function. Using simulated single-frequency wavefront, PSD values before and after applying Hanning window were computed an...
2005,
17.
Abstract:
Thermal stability of nanocrystalline intermetallic compound Cu4Al obtained from flow-levitation method is studied by means of DTA (Differential Thermal Analysis) and XRD (X-Ray Diffraction). By DTA experiments on Cu4Al nanopowder, three endothermal p...
Thermal stability of nanocrystalline intermetallic compound Cu4Al obtained from flow-levitation method is studied by means of DTA (Differential Thermal Analysis) and XRD (X-Ray Diffraction). By DTA experiments on Cu4Al nanopowder, three endothermal p...
2005,
17.
Abstract:
By analyzing the optical design in the off-axis and multi-pass amplification system, and combining the application in the three high power solid laser facilities, it is indicated that avoiding the ghost image damage and controlling the system aberrat...
By analyzing the optical design in the off-axis and multi-pass amplification system, and combining the application in the three high power solid laser facilities, it is indicated that avoiding the ghost image damage and controlling the system aberrat...
2005,
17.
Abstract:
A measurement apparatus which composes of a reformed atomic force microscope (AFM), a precision rotating air-bearing and a auxiliary transform rotary is developed. The spindle error is approximately 0.049 μm. This apparatus can measure the inertial c...
A measurement apparatus which composes of a reformed atomic force microscope (AFM), a precision rotating air-bearing and a auxiliary transform rotary is developed. The spindle error is approximately 0.049 μm. This apparatus can measure the inertial c...
2005,
17.
Abstract:
A simplified two-dimension calculation model for helical magnetic flux compression generator with explosive initiated axially(AMFCG) was built by Maxwell equation. By the theoretic model the calculation formula of magnetic flux was simplified, which ...
A simplified two-dimension calculation model for helical magnetic flux compression generator with explosive initiated axially(AMFCG) was built by Maxwell equation. By the theoretic model the calculation formula of magnetic flux was simplified, which ...
2005,
17.
Abstract:
By using the finite-difference time-domain method in two-dimension, the transient response of BJT (bipolar junction transistor) under the high power electromagnetic pulse was simulated. The distribution and variation of the electronic field, current ...
By using the finite-difference time-domain method in two-dimension, the transient response of BJT (bipolar junction transistor) under the high power electromagnetic pulse was simulated. The distribution and variation of the electronic field, current ...
2005,
17.
Abstract:
Considering the ponderomotive force, the high-power microwave propagation in waveguide filled with plasma is analyzed and simulated. The propagation characteristics of the high-power microwave and the relationship between the power of the microwave a...
Considering the ponderomotive force, the high-power microwave propagation in waveguide filled with plasma is analyzed and simulated. The propagation characteristics of the high-power microwave and the relationship between the power of the microwave a...
2005,
17.
Abstract:
Absolute instability is a major physics limitation in the realization of the ultimate capability of gyro-traveling-wave tube. The physical interpretations ,character and suppressing methods of absolute instability were analyzed and verified by a W-ba...
Absolute instability is a major physics limitation in the realization of the ultimate capability of gyro-traveling-wave tube. The physical interpretations ,character and suppressing methods of absolute instability were analyzed and verified by a W-ba...
2005,
17.
Abstract:
The bunching cavity with dielectric absorber for gyroklystron is studied by using the mode-matching technique to build scattering matrix. By the theoretical analysis and the numerical simulation, the effect of loss dielectric absorber on Q factor and...
The bunching cavity with dielectric absorber for gyroklystron is studied by using the mode-matching technique to build scattering matrix. By the theoretical analysis and the numerical simulation, the effect of loss dielectric absorber on Q factor and...
2005,
17.
Abstract:
The injection power of a diagnostic neutral beam (DNB) can be obtained with the thermocouple probe measurement system on the Hefei superconducting Tokamak-7 (HT-7). With the 49 kV, 6 A, 100 ms pulse charge of an acceleration electrode, a thermocouple...
The injection power of a diagnostic neutral beam (DNB) can be obtained with the thermocouple probe measurement system on the Hefei superconducting Tokamak-7 (HT-7). With the 49 kV, 6 A, 100 ms pulse charge of an acceleration electrode, a thermocouple...
2005,
17.
Abstract:
In order to reduce the amplitude of corkscrew motion to obtain a high current pulsed electron beam with good quality, both simulation and experimental work were done based on the beam transport system of “Dragon-I”, which is a pulsed high current ele...
In order to reduce the amplitude of corkscrew motion to obtain a high current pulsed electron beam with good quality, both simulation and experimental work were done based on the beam transport system of “Dragon-I”, which is a pulsed high current ele...
2005,
17.
Abstract:
A current-controlled model of semiconductor opening switch(SOS) was developed to study the current opening effect and the physical process of SOS in pulsed power system. The p+-p-n-n+ type SOS was analyzed on the basis of the model. The distributions...
A current-controlled model of semiconductor opening switch(SOS) was developed to study the current opening effect and the physical process of SOS in pulsed power system. The p+-p-n-n+ type SOS was analyzed on the basis of the model. The distributions...
2005,
17.
Abstract:
Conventional analog I/Q demodulator suffers from phase and amplitude imbalance and DC offset, which cause big error into the measurement. A digital PAD is designed. Based on I/Q demodulation principle, using digital algorithms, such as digital filter...
Conventional analog I/Q demodulator suffers from phase and amplitude imbalance and DC offset, which cause big error into the measurement. A digital PAD is designed. Based on I/Q demodulation principle, using digital algorithms, such as digital filter...
2005,
17.
Abstract:
The paper introduces the calculation and measurement method of Q factor which describes the performance of cyclotron's RF D circuit. It mainly introduces the formula and principle for calculating the Q factor. The calculation data are compared with t...
The paper introduces the calculation and measurement method of Q factor which describes the performance of cyclotron's RF D circuit. It mainly introduces the formula and principle for calculating the Q factor. The calculation data are compared with t...
2005,
17.
Abstract:
The control of the electron beam in an intense current linear induction accelerator(LIA)is very important. The center position of the electron beam and the beam profile are two important parameters which should be measured accurately. The setup of a ...
The control of the electron beam in an intense current linear induction accelerator(LIA)is very important. The center position of the electron beam and the beam profile are two important parameters which should be measured accurately. The setup of a ...
2005,
17.
Abstract:
Velvet as a cathode has the ability to emit intense multi-pulsed beams. The characteristics of the double-pulsed relativistic electron beams generated by velvet cathode were studied. The integral emittance and brightness of the double-pulsed beams we...
Velvet as a cathode has the ability to emit intense multi-pulsed beams. The characteristics of the double-pulsed relativistic electron beams generated by velvet cathode were studied. The integral emittance and brightness of the double-pulsed beams we...
2005,
17.
Abstract:
The principle of measuring the bunch length of the Beijing electron positron collider upgrade(BEPCⅡ) linac by harmonic bunch length monitor is presented. The measured bunch length ranging between 1.4 mm and 2.0 mm agrees well with the theoretic calcu...
The principle of measuring the bunch length of the Beijing electron positron collider upgrade(BEPCⅡ) linac by harmonic bunch length monitor is presented. The measured bunch length ranging between 1.4 mm and 2.0 mm agrees well with the theoretic calcu...
2005,
17.
Abstract:
Electron paramagnetic resonance(EPR) and cross-sectional transmission electron microscopy were used to study defect structure and radiated damage mechanism. Single crystal samples of cubic zirconia stabilized by 9.5 mol.% Y2O3 (YSZ) were implanted wi...
Electron paramagnetic resonance(EPR) and cross-sectional transmission electron microscopy were used to study defect structure and radiated damage mechanism. Single crystal samples of cubic zirconia stabilized by 9.5 mol.% Y2O3 (YSZ) were implanted wi...
2005,
17.
Abstract:
In this article, a non-laminar and non-collision numerical simulation model based on a third order trajectory equation is presented. In this model, the injection angles of beamlets are assumed as a random distribution. Simulation result shows that X-...
In this article, a non-laminar and non-collision numerical simulation model based on a third order trajectory equation is presented. In this model, the injection angles of beamlets are assumed as a random distribution. Simulation result shows that X-...
2005,
17.
Abstract:
The high beam current (0.9 A) and the large number of bunches (93 bunches) may cause coupled bunch instabilities (CBI) in BEPCII. Active feedback systems are required to suppress CBI. The BEPCII transverse feedback system mainly includes three parts ...
The high beam current (0.9 A) and the large number of bunches (93 bunches) may cause coupled bunch instabilities (CBI) in BEPCII. Active feedback systems are required to suppress CBI. The BEPCII transverse feedback system mainly includes three parts ...
