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RSS2001 Vol. 13, No. 01
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2001,
13.
Abstract:
According to the requirement of relativistic backward wave oscillator, a mode converter (and also a reflector). It converts the operating TM11 mode to TE11mode and at the same time, reflects the TE11 wave. At last, Gaussian-like HE11 mode is output by a metal horn. It is designed as a periodic cylindrically symmetric sinusoidal corrugation waveguide. and operates in 10GHz. Numerical simulations show the conversion efficiency in center frequency is over 90 percent, and the bandwidth is about 0.3GHz.
According to the requirement of relativistic backward wave oscillator, a mode converter (and also a reflector). It converts the operating TM11 mode to TE11mode and at the same time, reflects the TE11 wave. At last, Gaussian-like HE11 mode is output by a metal horn. It is designed as a periodic cylindrically symmetric sinusoidal corrugation waveguide. and operates in 10GHz. Numerical simulations show the conversion efficiency in center frequency is over 90 percent, and the bandwidth is about 0.3GHz.
2001,
13.
Abstract:
The useful boundary layer properties are discussed when an X-ray pulse is incident on common materials. Two characteristic times are given to determine whether steady-state theory is applicable. With expressions given in the paper, parameters of boundary layer , such as electron density, electric fields and their profile with distance, can be calculated expediently. An example is discussed to illustrate the use of these expressions.
The useful boundary layer properties are discussed when an X-ray pulse is incident on common materials. Two characteristic times are given to determine whether steady-state theory is applicable. With expressions given in the paper, parameters of boundary layer , such as electron density, electric fields and their profile with distance, can be calculated expediently. An example is discussed to illustrate the use of these expressions.
2001,
13.
Abstract:
A new approach, the multipole theory(MT) method, is briefly described for the computation of the resonant frquencies in the microwave cavity with cylindrical symmetry and complicated geometry shapes at the longitudinal section. The essential concept is to represent the solution of the axisymmetric Helmholtz equation by the generalized MT formula of 3-D Helmholtz equation. The MT formulation of the resonant frequencies is derived. By calculating three engineering examples, it is shown that the MT method is an effective approach for the computation of the resonant frequencies in cylindrical symmetric microwave cavities.
A new approach, the multipole theory(MT) method, is briefly described for the computation of the resonant frquencies in the microwave cavity with cylindrical symmetry and complicated geometry shapes at the longitudinal section. The essential concept is to represent the solution of the axisymmetric Helmholtz equation by the generalized MT formula of 3-D Helmholtz equation. The MT formulation of the resonant frequencies is derived. By calculating three engineering examples, it is shown that the MT method is an effective approach for the computation of the resonant frequencies in cylindrical symmetric microwave cavities.
2001,
13.
Abstract:
Tapered magnetically insulated line oscillator (MILO) was simulated by 2D particle-in-cell (PIC) electromagnetic code. The MILO's parameters for highest output power in C-band was researched. The physics mechanism about tapered MILO was explained. The mechanism shows that under the same conditions, tapered MILO can output higher power than conventional MILOs.
Tapered magnetically insulated line oscillator (MILO) was simulated by 2D particle-in-cell (PIC) electromagnetic code. The MILO's parameters for highest output power in C-band was researched. The physics mechanism about tapered MILO was explained. The mechanism shows that under the same conditions, tapered MILO can output higher power than conventional MILOs.
2001,
13.
Abstract:
In this paper, a method of measuring the receiving area of a given susceptible element within an electronic system by using the antenna measurement system and microwave network analyzer is presented. As an example, the receiving areas of a given point on the circuit board, which include Ar, the receiving area of the element, and Ar-max , the maximum receiving area when the given point is conjugated-matched, is measured. Measured results indicate that the receiving areas vary greatly with the frequency of the incident wave and the microwave coherent effect is obvious. Ar is dependent on both the impedance of the element and the radiation impedance of the circuit board while Ar-max is independent of the load, which gives approximate upper bounds on the power coupling of the given point on th
In this paper, a method of measuring the receiving area of a given susceptible element within an electronic system by using the antenna measurement system and microwave network analyzer is presented. As an example, the receiving areas of a given point on the circuit board, which include Ar, the receiving area of the element, and Ar-max , the maximum receiving area when the given point is conjugated-matched, is measured. Measured results indicate that the receiving areas vary greatly with the frequency of the incident wave and the microwave coherent effect is obvious. Ar is dependent on both the impedance of the element and the radiation impedance of the circuit board while Ar-max is independent of the load, which gives approximate upper bounds on the power coupling of the given point on th
2001,
13.
Abstract:
The design consideration of high power and high frequency Magnetically Insulated Transmission Line Oscillator (MILO) was made. With the two-dimension fully electromagnetic Particle-in-cell(PIC) simulation, the output power of 1.16GW at C band and 270MW at X band in MILO were obtained.
The design consideration of high power and high frequency Magnetically Insulated Transmission Line Oscillator (MILO) was made. With the two-dimension fully electromagnetic Particle-in-cell(PIC) simulation, the output power of 1.16GW at C band and 270MW at X band in MILO were obtained.
2001,
13.
Abstract:
Starting from Maxwell’s equations for the fields, and using the matching conditions of electromagnetic fields, a cold dispersion equation and field solutions of an equivalent periodic structure pertaining to the double-gap resonator are derived. The dispersion equation and field solutions are employed to numerically calculate frequencies and field distributions, the effect of the resonant cavity size on frequency is discussed , and the theoretical basis for design of C-band double-gap output cavity is provided.
Starting from Maxwell’s equations for the fields, and using the matching conditions of electromagnetic fields, a cold dispersion equation and field solutions of an equivalent periodic structure pertaining to the double-gap resonator are derived. The dispersion equation and field solutions are employed to numerically calculate frequencies and field distributions, the effect of the resonant cavity size on frequency is discussed , and the theoretical basis for design of C-band double-gap output cavity is provided.
2001,
13.
Abstract:
In order to avoid emittance growth due to field asymmetries，a symmetric input coupler is designed. The symmetric coupler is designed as a coaxial input coupler that couples to the cavity on the cavity axis. Asymmetric mode configurations are strongly suppressed since the symmetry of the cavity is not disturbed. In addition the construction of the cooling channels is facilitated since the coupler connects to the gun at an area of low heat deposition. In this paper the design of the parts of coupler is given. The size of the coupler is gained correctly and some experiments have been done. The voltage standing wave ratio of 1.357 is got. The coupler is proved to be practical and feasible.
In order to avoid emittance growth due to field asymmetries，a symmetric input coupler is designed. The symmetric coupler is designed as a coaxial input coupler that couples to the cavity on the cavity axis. Asymmetric mode configurations are strongly suppressed since the symmetry of the cavity is not disturbed. In addition the construction of the cooling channels is facilitated since the coupler connects to the gun at an area of low heat deposition. In this paper the design of the parts of coupler is given. The size of the coupler is gained correctly and some experiments have been done. The voltage standing wave ratio of 1.357 is got. The coupler is proved to be practical and feasible.
2001,
13.
Abstract:
In RF photoinjector, the diode-pumped self-mode-locked laser(GE-100) is used as the laser seeds in the driving laser, and the laser pulse's timing jitter is reduced down below 2ps by means of phase-locking technology. The detail of the timing jitter is discussed, the laser pulse's timing jitter is determined by the phase-noise of the driving signal and the instability of the mode-locked laser. So the high stable mode-locked laser and the driving signal of low phase-noise is required to the low timing jitter.
In RF photoinjector, the diode-pumped self-mode-locked laser(GE-100) is used as the laser seeds in the driving laser, and the laser pulse's timing jitter is reduced down below 2ps by means of phase-locking technology. The detail of the timing jitter is discussed, the laser pulse's timing jitter is determined by the phase-noise of the driving signal and the instability of the mode-locked laser. So the high stable mode-locked laser and the driving signal of low phase-noise is required to the low timing jitter.
2001,
13.
Abstract:
Heaven 1 pre-amplifier is a double pass, double sided electron beam pumped krF laser system. The largest energy transmission efficiency from the Marx generator to the diodes and smaller post-pulse were obtained by optimizing the anode-cathode gap. The energies deposited in the gas were investigated as a function of Marx voltage for both 30μm Al and 20μm Ti anode foils at 0.10，0.15, 0.20 and 0.22 MPa cell pressures. The investigation was performed for the same 35μm Ti pressure foil. The lifetimes of the anode and pressure foils were studied and the damage causes of the anode and pressure foils were analyzed . The optimization of experimental conditions for a long time operation was realized.
Heaven 1 pre-amplifier is a double pass, double sided electron beam pumped krF laser system. The largest energy transmission efficiency from the Marx generator to the diodes and smaller post-pulse were obtained by optimizing the anode-cathode gap. The energies deposited in the gas were investigated as a function of Marx voltage for both 30μm Al and 20μm Ti anode foils at 0.10，0.15, 0.20 and 0.22 MPa cell pressures. The investigation was performed for the same 35μm Ti pressure foil. The lifetimes of the anode and pressure foils were studied and the damage causes of the anode and pressure foils were analyzed . The optimization of experimental conditions for a long time operation was realized.
2001,
13.
Abstract:
The current generator is an important part of the electron beam scan device in an industrial irradiation LINAC. A new method for generating the scanning current is provided by the controlled currentfeedback-current mirror, and the current waveform is modified by the index of scanning flatness. A fine scanning flatness of electron beam is obtained, the speed of the flatting scan can be increased.
The current generator is an important part of the electron beam scan device in an industrial irradiation LINAC. A new method for generating the scanning current is provided by the controlled currentfeedback-current mirror, and the current waveform is modified by the index of scanning flatness. A fine scanning flatness of electron beam is obtained, the speed of the flatting scan can be increased.
2001,
13.
Abstract:
Through bombarding the Zr target by the electrons at energies from 20keV to 34 keV, the K-shell ionization cross section of Zr element is obtained. These data are reported for the first time in the world. In the experiment, the influence of the electrons reflected from the thick substrate was corrected by means of a bipartition model of the electron transport. The mean path of the electrons passing through the Zr target of 24.3m g/cm2 mass thickness is calculated by the EGS4 program of Monte Carlo techniquesl.
Through bombarding the Zr target by the electrons at energies from 20keV to 34 keV, the K-shell ionization cross section of Zr element is obtained. These data are reported for the first time in the world. In the experiment, the influence of the electrons reflected from the thick substrate was corrected by means of a bipartition model of the electron transport. The mean path of the electrons passing through the Zr target of 24.3m g/cm2 mass thickness is calculated by the EGS4 program of Monte Carlo techniquesl.
2001,
13.
Abstract:
The fast neutron spherical critical assemblies are analyzed by means of the Monte -Carlo method with multi-group section data. The calculated keff are consistent with the experimental results. The neutron flux density versus energy distribution presents a single maximum in the core made up of high enriched uranium and the distribution presents two maximums in the reflecting layer made up of natural uranium. The neutron spectrum hardens as the radius increases in the bare spherical assembly and softens as radius increases in the assembly with reflecting layer.
The fast neutron spherical critical assemblies are analyzed by means of the Monte -Carlo method with multi-group section data. The calculated keff are consistent with the experimental results. The neutron flux density versus energy distribution presents a single maximum in the core made up of high enriched uranium and the distribution presents two maximums in the reflecting layer made up of natural uranium. The neutron spectrum hardens as the radius increases in the bare spherical assembly and softens as radius increases in the assembly with reflecting layer.
2001,
13.
Abstract:
The expression of the DC clearing electrode field is derived by the conformal transformation method. The influence on the beam parameters by DC clearing electrode fields is analyzed. As examples, the vertical orbit change is induced by the dipole field, the betatron tune shift is induced by the quadrupole field, the additional corrected chromaticity is induced by the sexupole, and so on. several measurement results are given.
The expression of the DC clearing electrode field is derived by the conformal transformation method. The influence on the beam parameters by DC clearing electrode fields is analyzed. As examples, the vertical orbit change is induced by the dipole field, the betatron tune shift is induced by the quadrupole field, the additional corrected chromaticity is induced by the sexupole, and so on. several measurement results are given.
2001,
13.
Abstract:
Based on the stress relaxation model in 1D planar geometry and the visco-elastic constitutive equation, the temperature and stress histories in the K9 glass samples irradiated by CW lser beams (l =1.06μｍ) have been calculated in this paper. The results indicate that the residual tensile stress due to the stress relaxation effect during cooling after the laser radiation may be greater than the tensile fracture strength of samples, while the maximum compression stress during the laser heating is less than the requirement for compression damage. For a K9 glass window of 3mm thickness, its damage due to the stress relaxation may be induced by a laser radiation of 946kW/cm2 for 0.2s. Therefore, the stress relaxation should be regarded as the main mechanism of damage in K9 glass windows while
Based on the stress relaxation model in 1D planar geometry and the visco-elastic constitutive equation, the temperature and stress histories in the K9 glass samples irradiated by CW lser beams (l =1.06μｍ) have been calculated in this paper. The results indicate that the residual tensile stress due to the stress relaxation effect during cooling after the laser radiation may be greater than the tensile fracture strength of samples, while the maximum compression stress during the laser heating is less than the requirement for compression damage. For a K9 glass window of 3mm thickness, its damage due to the stress relaxation may be induced by a laser radiation of 946kW/cm2 for 0.2s. Therefore, the stress relaxation should be regarded as the main mechanism of damage in K9 glass windows while
2001,
13.
Abstract:
Fourth-generation light sources, which would involve potentially higher brilliance, a higher degree of coherence, and ultrashort pulses, possibly at the hard X-ray region, be based on the self-amplified spontaneous emission principle of free electron lasers, would offer a further major advance in scientific capabilities. In this paper, the development history, the relationship with SASE FEL, the unique properties and the future applications of such sources are summarized and reviewed briefly.
Fourth-generation light sources, which would involve potentially higher brilliance, a higher degree of coherence, and ultrashort pulses, possibly at the hard X-ray region, be based on the self-amplified spontaneous emission principle of free electron lasers, would offer a further major advance in scientific capabilities. In this paper, the development history, the relationship with SASE FEL, the unique properties and the future applications of such sources are summarized and reviewed briefly.
2001,
13.
Abstract:
This paper describes a novel quasi-optical tunable radiation source with relativistic electron beam of middle energy and a quasi-optical resonator complied with diffraction grating and three-mirror reflector. Coherent radiation with peak power of several tens of kW at 3mm waveband is successfully detected from an experimental facility characterized by beam energy of 400—500 kV, pulse length of 70 ns, pulse beam current of 0.2 kA, and pulse magnetic field of up to 1.2 T.
This paper describes a novel quasi-optical tunable radiation source with relativistic electron beam of middle energy and a quasi-optical resonator complied with diffraction grating and three-mirror reflector. Coherent radiation with peak power of several tens of kW at 3mm waveband is successfully detected from an experimental facility characterized by beam energy of 400—500 kV, pulse length of 70 ns, pulse beam current of 0.2 kA, and pulse magnetic field of up to 1.2 T.
2001,
13.
Abstract:
On the basis of the vector non-paraxial nonlinear Schrdinger equation, the property of self-focusing of intense laser beam is analytically investigated by a modulation theory. The role in self-focusing of the nonzero ▽·E term and that of nonparaxiality are compared. It is shown that both effects can arrest catastrophic collapse of the beam, leading to a periodic focusing-defocusing oscillation. For the aspect of collapse arresting, the nonzero ▽·E term is dominant over nonparaxiality.
On the basis of the vector non-paraxial nonlinear Schrdinger equation, the property of self-focusing of intense laser beam is analytically investigated by a modulation theory. The role in self-focusing of the nonzero ▽·E term and that of nonparaxiality are compared. It is shown that both effects can arrest catastrophic collapse of the beam, leading to a periodic focusing-defocusing oscillation. For the aspect of collapse arresting, the nonzero ▽·E term is dominant over nonparaxiality.
2001,
13.
Abstract:
The power in the bucket (PIB) and b -parameter are chosen as criteria for characterizing the beam quality, the effect of the spherical aberration coefficient and obscure ratio of an annular lens on the super-Gaussian beam quality is analyzed. It is shown that there are different PIB curves at the geometrical and real focal planes, and by a suitable choice of the parameter of negative spherically aberrated annular lens the better power /energy focusability can be achieved as compared with the annular lens without spherical aberration.
The power in the bucket (PIB) and b -parameter are chosen as criteria for characterizing the beam quality, the effect of the spherical aberration coefficient and obscure ratio of an annular lens on the super-Gaussian beam quality is analyzed. It is shown that there are different PIB curves at the geometrical and real focal planes, and by a suitable choice of the parameter of negative spherically aberrated annular lens the better power /energy focusability can be achieved as compared with the annular lens without spherical aberration.
2001,
13.
Abstract:
Theoretical and experimental study on the optical properties of the free-vortex aerodynamic window (FADW) using the method of far-field beam is described. It mainly reports the deflexion and jitter of the far-field converged beam of He-Ne laser through the FADW.And the beam quality factor b of the FADW has been defined and studied in particular. At the same time it discusses the effect on the far-field beam spatial distribution of the FADW.At last it proposes the reference of the further study on the beam quality and the optimize design of the FADW.
Theoretical and experimental study on the optical properties of the free-vortex aerodynamic window (FADW) using the method of far-field beam is described. It mainly reports the deflexion and jitter of the far-field converged beam of He-Ne laser through the FADW.And the beam quality factor b of the FADW has been defined and studied in particular. At the same time it discusses the effect on the far-field beam spatial distribution of the FADW.At last it proposes the reference of the further study on the beam quality and the optimize design of the FADW.
2001,
13.
Abstract:
The dose would be enhanced in low Z material when X-ray enters the interface which is constructed with different materials. The mechanic of dose enhancement is introduced in this article, and the Dose Enhancement Factors Of W-SiO2、Ta-SiO2 interface are calculated in the article. The calculated results demonstrate that there exits stronger dose-enhancement in the SiO2 side near the interface when the energy of X-ray is between 100keV and 150keV.
The dose would be enhanced in low Z material when X-ray enters the interface which is constructed with different materials. The mechanic of dose enhancement is introduced in this article, and the Dose Enhancement Factors Of W-SiO2、Ta-SiO2 interface are calculated in the article. The calculated results demonstrate that there exits stronger dose-enhancement in the SiO2 side near the interface when the energy of X-ray is between 100keV and 150keV.
2001,
13.
Abstract:
A series of films were prepared by reactive evaporation. The microstructure defects on film surfaces and effect of substrate cleaning procedures on laser induced damage threshold were investigated. The RMS surface roughness of uncoated and coated substrates were measured. It was shown that the coating process could increase or decrease the surface roughness and had obvious effects on damage threshold.
A series of films were prepared by reactive evaporation. The microstructure defects on film surfaces and effect of substrate cleaning procedures on laser induced damage threshold were investigated. The RMS surface roughness of uncoated and coated substrates were measured. It was shown that the coating process could increase or decrease the surface roughness and had obvious effects on damage threshold.
2001,
13.
Abstract:
Utilizing lidar to obtain the wind velocity along the line of sight by Doppler shift, then inverting these velocity vectors to real atmosphere wind group speed is a very important purpose of lidar. In this paper, we will describe the technique which utilize conical scanning known as velocity azimuth display based on single LDV system. The horizontal and vertical wind sect of the observed field can be gained by spatial analytic geometry’s operation and analysis on the four orthogonal points on the scanning cone’s vertical section.
Utilizing lidar to obtain the wind velocity along the line of sight by Doppler shift, then inverting these velocity vectors to real atmosphere wind group speed is a very important purpose of lidar. In this paper, we will describe the technique which utilize conical scanning known as velocity azimuth display based on single LDV system. The horizontal and vertical wind sect of the observed field can be gained by spatial analytic geometry’s operation and analysis on the four orthogonal points on the scanning cone’s vertical section.
2001,
13.
Abstract:
Two-dimensional steady heat transport equation is used to calculate the temperature rise on the surface of BHP (Basic Hydrogen Peroxide) solutions of the Jet Singlet Oxygen Generator (JSOG). And analytical result is obtained. The water vapor content in JSOG depending on the surface temperature of BHP solutions and other factors is also studied qualitatively.
Two-dimensional steady heat transport equation is used to calculate the temperature rise on the surface of BHP (Basic Hydrogen Peroxide) solutions of the Jet Singlet Oxygen Generator (JSOG). And analytical result is obtained. The water vapor content in JSOG depending on the surface temperature of BHP solutions and other factors is also studied qualitatively.
2001,
13.
Abstract:
The intensity of CO2 laser was correlated with the time delay by reason of the spontaneous emission fluctuation. The experimental and theoretical results show that when the laser peak present before the minimum switched loss, the larger the initial spontaneous emission, the shorter the time delay, because of and the intensity of laser peak is smaller in a B-class CO2 laser. When the laser peak present after the minimum switched loss, the time delay is longer because of the larger initial spontaneous emission, the intensity of laser peak is also larger.
The intensity of CO2 laser was correlated with the time delay by reason of the spontaneous emission fluctuation. The experimental and theoretical results show that when the laser peak present before the minimum switched loss, the larger the initial spontaneous emission, the shorter the time delay, because of and the intensity of laser peak is smaller in a B-class CO2 laser. When the laser peak present after the minimum switched loss, the time delay is longer because of the larger initial spontaneous emission, the intensity of laser peak is also larger.
2001,
13.
Abstract:
Two different phase reconstruct algorithms are deseribed in this paper. the principle and the practical formula of the reconstruct algorithms are mainly described. Using a HS plate with hole array instead of HS wavefront sensor, the phase of Starlight II 1012W high power laser is measured. And the results of two reconstructed phases are analyzed. The P-V (peak-valley) and RMS (root-mean-square) values are also compared.
Two different phase reconstruct algorithms are deseribed in this paper. the principle and the practical formula of the reconstruct algorithms are mainly described. Using a HS plate with hole array instead of HS wavefront sensor, the phase of Starlight II 1012W high power laser is measured. And the results of two reconstructed phases are analyzed. The P-V (peak-valley) and RMS (root-mean-square) values are also compared.
2001,
13.
Abstract:
An optical source used to pump XeF(C-A) laser is introduced. The discharge breakdown property, the current as a function of charge voltage in different gas, the discharge homogeneity and the effect of different gas composition on the discharge radiation have been experimentally studied. The discharge breakdown time, peak current as a function of charge voltage and buffer gas are obtained. The methods of increasing the discharge homogeneity are analysed. The time-integrated spectra of discharge radiation under different experimental conditions are also obtained. By analysing radiation spectra, the optimum experimental condition of photo-dissociation XeF2 is defined. The radiation intensity on the XUV region arrives the maximum value in case of pAr : pN2 =1:1.
An optical source used to pump XeF(C-A) laser is introduced. The discharge breakdown property, the current as a function of charge voltage in different gas, the discharge homogeneity and the effect of different gas composition on the discharge radiation have been experimentally studied. The discharge breakdown time, peak current as a function of charge voltage and buffer gas are obtained. The methods of increasing the discharge homogeneity are analysed. The time-integrated spectra of discharge radiation under different experimental conditions are also obtained. By analysing radiation spectra, the optimum experimental condition of photo-dissociation XeF2 is defined. The radiation intensity on the XUV region arrives the maximum value in case of pAr : pN2 =1:1.
2001,
13.
Abstract:
The experiments were performed to determine the profile of electron temperature in Mg/Al dotted target irradiated by laser beams at wavelength of 0.35μm from the “Xing Guang Ⅱ” laser facility. X-ray spectra from the target were measured by a spatially resolved crystal spectrometer. The technique of multi-configuration Dirac-Fock was used to calculate relevant atomic parameters. Variations of relative intensity of isoelectronic lines from the double tracing materials in laser-produced plasmas with electron temperature were derived according to local-thermodynamic-equilibrium model. And, the spatial character of electron temperature in plasmas was determined via isoelectronic spectral line intensity ratios.
The experiments were performed to determine the profile of electron temperature in Mg/Al dotted target irradiated by laser beams at wavelength of 0.35μm from the “Xing Guang Ⅱ” laser facility. X-ray spectra from the target were measured by a spatially resolved crystal spectrometer. The technique of multi-configuration Dirac-Fock was used to calculate relevant atomic parameters. Variations of relative intensity of isoelectronic lines from the double tracing materials in laser-produced plasmas with electron temperature were derived according to local-thermodynamic-equilibrium model. And, the spatial character of electron temperature in plasmas was determined via isoelectronic spectral line intensity ratios.
2001,
13.
Abstract:
Parameters determining the widths shifts of the CIV lines CIV 2s 2S-2p2P0 are calculated by using the impact approximation and accurate close-coupling theory for the (CIV+e) collision problem. Line widths and shifts are calculated according to the derived parameters. The calculated line widths are compared with the semi-classical calculations and good agreements are found. The discrepancy between the experimental and theoretical Stark widths is almost a factor of 2.
Parameters determining the widths shifts of the CIV lines CIV 2s 2S-2p2P0 are calculated by using the impact approximation and accurate close-coupling theory for the (CIV+e) collision problem. Line widths and shifts are calculated according to the derived parameters. The calculated line widths are compared with the semi-classical calculations and good agreements are found. The discrepancy between the experimental and theoretical Stark widths is almost a factor of 2.
2001,
13.
Abstract:
One-dimension multi-group radiation transfer program was used to simulate the processes of re-emission for Au disk. Some results about the re-emission spectrum, the re-emission flux, the albedo and the equivalent temperature at the boundary are given, and the variations of re-emission spectrum with the incident flux are analyzed. It is found that the re-emission spectrum is closely related with the depth of ablation and the optical thickness of corona plasma.
One-dimension multi-group radiation transfer program was used to simulate the processes of re-emission for Au disk. Some results about the re-emission spectrum, the re-emission flux, the albedo and the equivalent temperature at the boundary are given, and the variations of re-emission spectrum with the incident flux are analyzed. It is found that the re-emission spectrum is closely related with the depth of ablation and the optical thickness of corona plasma.
2001,
13.
Abstract:
The paper focuses on the production of CH film by way of hot wire chemical vapor deposition. The effect of substrate temperature, evaporator temperature and substrate distance on the deposition rate of the CH film is discussed. The CH film with thickness range of 4~30m m is produced with the substrate temperature being 235~265K and the evaporator temperature being 370~410K. It is observed that under the condition of low substrate temperature and appropriate evaporator temperature, the deposition rate would be higher, while substrate distance had little effect on it. The IR spectrum and mass spectrum show that the CH film mainly consists polystyrene.
The paper focuses on the production of CH film by way of hot wire chemical vapor deposition. The effect of substrate temperature, evaporator temperature and substrate distance on the deposition rate of the CH film is discussed. The CH film with thickness range of 4~30m m is produced with the substrate temperature being 235~265K and the evaporator temperature being 370~410K. It is observed that under the condition of low substrate temperature and appropriate evaporator temperature, the deposition rate would be higher, while substrate distance had little effect on it. The IR spectrum and mass spectrum show that the CH film mainly consists polystyrene.
