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RSS2005 Vol. 17, No. 08
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2005,
17.
Abstract:
Spatial harmonic coefficients are theoretically calculated for transverse magnetic TM01 mode in slow wave structure (SWS) of relativistic backward-wave oscillators(RBWO). It is proved that there are four means to construct resonant SWS cavities whose...
Spatial harmonic coefficients are theoretically calculated for transverse magnetic TM01 mode in slow wave structure (SWS) of relativistic backward-wave oscillators(RBWO). It is proved that there are four means to construct resonant SWS cavities whose...
2005,
17.
Abstract:
In this paper, the three-dimensional simulation code MAFIA and its quasi-periodic boundary conditions and the postprocessor are used to determine the coupled cavity slow wave structure cold-test characteristics. Some simulation methods of dispersion ...
In this paper, the three-dimensional simulation code MAFIA and its quasi-periodic boundary conditions and the postprocessor are used to determine the coupled cavity slow wave structure cold-test characteristics. Some simulation methods of dispersion ...
2005,
17.
Abstract:
A high power traveling wave tube (TWT) using a ferroelectric cathode as the electron source is reported. The Ferroelectric electron gun (FEG) consists of PLZT ceramic and field enhancing grids, which allows an electron beam to be extracted from the F...
A high power traveling wave tube (TWT) using a ferroelectric cathode as the electron source is reported. The Ferroelectric electron gun (FEG) consists of PLZT ceramic and field enhancing grids, which allows an electron beam to be extracted from the F...
2005,
17.
Abstract:
The high-power millimeter device with large diameter, short period and two SWSs is put forward. The device is analysed using our universal linear theory and PIC method. The output power and frequency of the device are measured. The experimental resul...
The high-power millimeter device with large diameter, short period and two SWSs is put forward. The device is analysed using our universal linear theory and PIC method. The output power and frequency of the device are measured. The experimental resul...
2005,
17.
Abstract:
An experiment on an axial feedback vircator was performed on the intense electron beam accelerator SPARK-04. The far-field measurement method was employed to obtain the main mode and the power of the microwave generated by this device. The experiment...
An experiment on an axial feedback vircator was performed on the intense electron beam accelerator SPARK-04. The far-field measurement method was employed to obtain the main mode and the power of the microwave generated by this device. The experiment...
2005,
17.
Abstract:
An 8 mm fundamental wave gyro traveling wave tube is studied. By the analysis of stability, the parameters are determined. Employing a PIC code, the interaction between electron beam and wave is simulated and discussed in detail, and the primary desi...
An 8 mm fundamental wave gyro traveling wave tube is studied. By the analysis of stability, the parameters are determined. Employing a PIC code, the interaction between electron beam and wave is simulated and discussed in detail, and the primary desi...
2005,
17.
Abstract:
This paper focuses on two factors of 0-harmonic component and modes interval in frequency-agile relativistic magnetron under thermal cavity condition by way of example of 10 cavites rising-sun magnetron. Based on the analysis of these factors, it sug...
This paper focuses on two factors of 0-harmonic component and modes interval in frequency-agile relativistic magnetron under thermal cavity condition by way of example of 10 cavites rising-sun magnetron. Based on the analysis of these factors, it sug...
2005,
17.
Abstract:
The three-dimensional analysis PIC code KARAT-3D was used to assess the multiple beam klystron(MBK). A power output of about 128 kW was obtained at 1.25 GHz when input voltage was 14 kV and input current was 20.8 A. Specially, the beam transimission ...
The three-dimensional analysis PIC code KARAT-3D was used to assess the multiple beam klystron(MBK). A power output of about 128 kW was obtained at 1.25 GHz when input voltage was 14 kV and input current was 20.8 A. Specially, the beam transimission ...
2005,
17.
Abstract:
According to the Maxwell equations, an analytic solution related with coaxial diode current, applied voltage and geometry parameters is obtained by introducing certain approximation. The relation among the coaxial diode impedance, the potential distr...
According to the Maxwell equations, an analytic solution related with coaxial diode current, applied voltage and geometry parameters is obtained by introducing certain approximation. The relation among the coaxial diode impedance, the potential distr...
2005,
17.
Abstract:
A C-band magnetically insulated transmission line oscillator (MILO) has been designed, manufactured and tested. The C-band MILO typically operates in single-shot mode with 437~464 kV, 36~39 kA beam pulses, generating 1.60~1.68 GW high power microwave...
A C-band magnetically insulated transmission line oscillator (MILO) has been designed, manufactured and tested. The C-band MILO typically operates in single-shot mode with 437~464 kV, 36~39 kA beam pulses, generating 1.60~1.68 GW high power microwave...
2005,
17.
Abstract:
The ghigh peak power klystron works as a high power microwave source and is receiving much recognition. The single beam high power klystron has experienced many drawbacks that are unable to overcome, such as the high operating voltage, the low output...
The ghigh peak power klystron works as a high power microwave source and is receiving much recognition. The single beam high power klystron has experienced many drawbacks that are unable to overcome, such as the high operating voltage, the low output...
2005,
17.
Abstract:
An S-band MILO was designed by 2D particle-in-cell(PIC) electromagnetic code, based on the L-band hard-tube MILO of the Philips laboratory. The working frequency of the S-band MILO was 2.3 GHz. The design was further improved to increase the output p...
An S-band MILO was designed by 2D particle-in-cell(PIC) electromagnetic code, based on the L-band hard-tube MILO of the Philips laboratory. The working frequency of the S-band MILO was 2.3 GHz. The design was further improved to increase the output p...
2005,
17.
Abstract:
A high power UWB pulse radiation source was developed, which was composed of a repetition rate high power pulse source, a wideband pulse producing setup and a wideband pulse emission antenna. The parameters of the high power UWB pulse radiation sourc...
A high power UWB pulse radiation source was developed, which was composed of a repetition rate high power pulse source, a wideband pulse producing setup and a wideband pulse emission antenna. The parameters of the high power UWB pulse radiation sourc...
2005,
17.
Abstract:
A coaxial vircator with a new kind of quasi- optical resonator was presented. The 3- mirror cavity's field distribution shows that the maximum field in the resonator is located in the cavity's center, which can greatly enhance the beam- wave interact...
A coaxial vircator with a new kind of quasi- optical resonator was presented. The 3- mirror cavity's field distribution shows that the maximum field in the resonator is located in the cavity's center, which can greatly enhance the beam- wave interact...
2005,
17.
Abstract:
In order to analyze the rectangular waveguide grating which is a typical slow wave structure, the dispersion relation was obtained by the field-matching method. The coupling impedance was subsequently obtained from the relevant equations. The higher ...
In order to analyze the rectangular waveguide grating which is a typical slow wave structure, the dispersion relation was obtained by the field-matching method. The coupling impedance was subsequently obtained from the relevant equations. The higher ...
2005,
17.
Abstract:
By means of coaxial apparatus, a high electrical voltage breakdown experiment for pressurized glycol/water mixture with microsecond charging is carried out. The experimental results are presented and analyzed. The conclusions are shown as follows: th...
By means of coaxial apparatus, a high electrical voltage breakdown experiment for pressurized glycol/water mixture with microsecond charging is carried out. The experimental results are presented and analyzed. The conclusions are shown as follows: th...
2005,
17.
Abstract:
An experimental system of foilless diode operating in low guiding magnetic field was designed on the pulsed power generator S-5N. In the experiment, a trapezium-shape wavefrom was obtained with a rise time of about 9 ns and a flat top of about 26 ns ...
An experimental system of foilless diode operating in low guiding magnetic field was designed on the pulsed power generator S-5N. In the experiment, a trapezium-shape wavefrom was obtained with a rise time of about 9 ns and a flat top of about 26 ns ...
2005,
17.
Abstract:
The principle and parameters of a low impedance pulsed electron accelerator MC55 are described. The experimental waveforms of the electron beam produced by MC55 are also presented. MC55 consists a 24-stages Marx generator, a 10 Ω water coaxial pulse ...
The principle and parameters of a low impedance pulsed electron accelerator MC55 are described. The experimental waveforms of the electron beam produced by MC55 are also presented. MC55 consists a 24-stages Marx generator, a 10 Ω water coaxial pulse ...
2005,
17.
Abstract:
Models of electron emission mechanism are established concerning metal and carbon fiber cathodes. Correctness of the electron emission mechanism was proved according to micro-photos and electron scanning photos of cathodes respectively. The experimen...
Models of electron emission mechanism are established concerning metal and carbon fiber cathodes. Correctness of the electron emission mechanism was proved according to micro-photos and electron scanning photos of cathodes respectively. The experimen...
2005,
17.
Abstract:
This paper summarizes recent results of the study and development of high-power repetitive nanosecond generators employing a semiconductor opening switch(SOS). The SOS-based pulsed power generator(SPG200, SPG700) has been developed and tested in Nort...
This paper summarizes recent results of the study and development of high-power repetitive nanosecond generators employing a semiconductor opening switch(SOS). The SOS-based pulsed power generator(SPG200, SPG700) has been developed and tested in Nort...
2005,
17.
Abstract:
The lifetime of conventional trigatron is limited by the erosion of the trigger electrode. An extended lifetime trigatron was designed with three new types of trigger electrode based on the analysis of trigger mechanism. The experimental results indi...
The lifetime of conventional trigatron is limited by the erosion of the trigger electrode. An extended lifetime trigatron was designed with three new types of trigger electrode based on the analysis of trigger mechanism. The experimental results indi...
2005,
17.
Abstract:
The spiral line was analyzed through a simple theory, the code simulation and the experimental test. The pulse width of spiral forming line was widened comparing with that of non-spiral forming line, which could be determined by a simple formula and ...
The spiral line was analyzed through a simple theory, the code simulation and the experimental test. The pulse width of spiral forming line was widened comparing with that of non-spiral forming line, which could be determined by a simple formula and ...
2005,
17.
Abstract:
The experimental studies of 400 kW PSM high voltage power supply are summarized in this paper. Firstly, the rapid protective method to shut down high voltage in 10 μs under over-current situation is described. The arc-deposited energy in the process ...
The experimental studies of 400 kW PSM high voltage power supply are summarized in this paper. Firstly, the rapid protective method to shut down high voltage in 10 μs under over-current situation is described. The arc-deposited energy in the process ...
2005,
17.
Abstract:
Using the finite element method, a numerical study of the electric field enhancement factor of a metallic microprotrusion on the cathode surface of an infinite planar diode was presented. According to the numeral results, the relationship between the...
Using the finite element method, a numerical study of the electric field enhancement factor of a metallic microprotrusion on the cathode surface of an infinite planar diode was presented. According to the numeral results, the relationship between the...
2005,
17.
Abstract:
The high electric field of high power microwave propagating in atmosphere makes air breakdown possible, which confines the maximun transmitting power of microwave antenna because of its intense power density. It is in the near field that the air brea...
The high electric field of high power microwave propagating in atmosphere makes air breakdown possible, which confines the maximun transmitting power of microwave antenna because of its intense power density. It is in the near field that the air brea...
2005,
17.
Abstract:
In an HPM radiation system, the horn feeds which have high power capacity and favorable radiation performance are required. The multimode and smooth-wall horn can fulfill the requirement. Based on the single step mode-matching technololgy, the method...
In an HPM radiation system, the horn feeds which have high power capacity and favorable radiation performance are required. The multimode and smooth-wall horn can fulfill the requirement. Based on the single step mode-matching technololgy, the method...
2005,
17.
Abstract:
Mode coupling coefficients are the bases of coupled-wave theory (CWT). The mode coupling coefficients in coaxial waveguide with radii changes were deduced. It is revealed that the mode coupling coefficients in circular waveguide are just the special ...
Mode coupling coefficients are the bases of coupled-wave theory (CWT). The mode coupling coefficients in coaxial waveguide with radii changes were deduced. It is revealed that the mode coupling coefficients in circular waveguide are just the special ...
2005,
17.
Abstract:
The low-frequency-compensation principle for TEM-horn antenna was verified by experiment. The low frequency transmission and radiation characters were improved by the low-frequency-compensation. When the magnitudes and directions of the electric and ...
The low-frequency-compensation principle for TEM-horn antenna was verified by experiment. The low frequency transmission and radiation characters were improved by the low-frequency-compensation. When the magnitudes and directions of the electric and ...
2005,
17.
Abstract:
An improved COBRA lens antenna in X-band for TM01 mode is designed. The dielectric lens consisting of three or four sectors is located on the aperture plane of a conical horn. The antenna can radiate circular polarzied patterns, with a boresight peak...
An improved COBRA lens antenna in X-band for TM01 mode is designed. The dielectric lens consisting of three or four sectors is located on the aperture plane of a conical horn. The antenna can radiate circular polarzied patterns, with a boresight peak...
2005,
17.
Abstract:
In this paper，the finite-difference time-domain (FDTD) and the discrete fast Fourier transform (DFFT) methods are adopted to calculate the transfer function and the sensitivity of TEM horn of various length and flare angle. The max relative error and...
In this paper，the finite-difference time-domain (FDTD) and the discrete fast Fourier transform (DFFT) methods are adopted to calculate the transfer function and the sensitivity of TEM horn of various length and flare angle. The max relative error and...
2005,
17.
Abstract:
This paper presents a high power feed system for 7.3 m Cassegrain antenna. In order to make E and H patterns of the feed equal in the illuminated area, the dual-mode conical horn is chosen as the feed form. Since the high power signal is transmitted ...
This paper presents a high power feed system for 7.3 m Cassegrain antenna. In order to make E and H patterns of the feed equal in the illuminated area, the dual-mode conical horn is chosen as the feed form. Since the high power signal is transmitted ...
2005,
17.
Abstract:
The axis length and the beat-wave wavelength in double-bent circular waveguide TM01-TE11 mode converter are analyzed, keeping the axis of the output port parallel to that of the input port and keeping the two curvature radii equal. It is proved that ...
The axis length and the beat-wave wavelength in double-bent circular waveguide TM01-TE11 mode converter are analyzed, keeping the axis of the output port parallel to that of the input port and keeping the two curvature radii equal. It is proved that ...
2005,
17.
Abstract:
Severe attenuation happens when the high-power microwave propagates through a certain altitude. At this altitude, the microwave pulse will ionize the surrounding air and create a plasma, so the severe nonlinear attenuation will be caused, even the br...
Severe attenuation happens when the high-power microwave propagates through a certain altitude. At this altitude, the microwave pulse will ionize the surrounding air and create a plasma, so the severe nonlinear attenuation will be caused, even the br...
2005,
17.
Abstract:
Based on physic-optics and geometric-optics, a design method of high power microwave feed vacuum output window was discussed. For an X band, 1.5 GW pulse power handling ability gaussian feed, a dishing type of Teflon vacuum output window was fabricat...
Based on physic-optics and geometric-optics, a design method of high power microwave feed vacuum output window was discussed. For an X band, 1.5 GW pulse power handling ability gaussian feed, a dishing type of Teflon vacuum output window was fabricat...
2005,
17.
Abstract:
The sand and dust attenuation has a great effect on the microwave propagation in the air. The calculation model of the sand and dust attenuation was got, combining the formula of the complex dielectric constant of dry sand with the dielectric constan...
The sand and dust attenuation has a great effect on the microwave propagation in the air. The calculation model of the sand and dust attenuation was got, combining the formula of the complex dielectric constant of dry sand with the dielectric constan...
2005,
17.
Abstract:
The effect of HPM on the intracellular calcium of sperm cells was determined using laser scanning confocal microscopy. The abnormality，micronucleus frequency，livability, numbers and the acrosin reaction of the sperm cells were studied at the same tim...
The effect of HPM on the intracellular calcium of sperm cells was determined using laser scanning confocal microscopy. The abnormality，micronucleus frequency，livability, numbers and the acrosin reaction of the sperm cells were studied at the same tim...
2005,
17.
Abstract:
The characteristics of microwave pulses from different sources penetrating various kind of walls were studied. The walls used in the experiment included common brick-mix wall, common reinforced concrete wall and reinforcing steel bar-net concrete wal...
The characteristics of microwave pulses from different sources penetrating various kind of walls were studied. The walls used in the experiment included common brick-mix wall, common reinforced concrete wall and reinforcing steel bar-net concrete wal...
2005,
17.
Abstract:
The electromagnetic interaction with electric devices caused by high power microwave(HPM) is now much concerned. The BLT equation can solve some problems of electromagnetic interaction. This paper firstly introduces the formulations of the BLT equati...
The electromagnetic interaction with electric devices caused by high power microwave(HPM) is now much concerned. The BLT equation can solve some problems of electromagnetic interaction. This paper firstly introduces the formulations of the BLT equati...
2005,
17.
Abstract:
The retinal histopathological effects and electro-retinograms (ERG) were recorded before and after exposure to determine ocular structural and functional and retinal ultra-structural changes in chinchilla rabbits. It is shown that HPM exposure may br...
The retinal histopathological effects and electro-retinograms (ERG) were recorded before and after exposure to determine ocular structural and functional and retinal ultra-structural changes in chinchilla rabbits. It is shown that HPM exposure may br...
