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RSS2007 Vol. 19, No. 06
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Particle simulation and experimental study of subnanosecond millimeter wave backward wave oscillator
2007,
19.
Abstract:
The particle simulation of the subnanosecond millimeter wave backward wave oscillator was carried out by KARAT code, the experiment was done under the condition of the electron beam with voltage 200 kV, current 500 A, pulse width 1.65 ns, and guiding...
The particle simulation of the subnanosecond millimeter wave backward wave oscillator was carried out by KARAT code, the experiment was done under the condition of the electron beam with voltage 200 kV, current 500 A, pulse width 1.65 ns, and guiding...
2007,
19.
Abstract:
An optimized X-band relativistic backward wave oscillator (RBWO) based on superradiance mechanism of short electron beam was designed and simulated numerically. The simulation results indicate that the RBWO can realize microwave radiation with high p...
An optimized X-band relativistic backward wave oscillator (RBWO) based on superradiance mechanism of short electron beam was designed and simulated numerically. The simulation results indicate that the RBWO can realize microwave radiation with high p...
2007,
19.
Abstract:
By means of the 2-D simplified model，the dynamic process of the exploding tube of MFCG is simulated. The simulation results show that the expanding angle can be varied with the radial position(or different time) due to the radial velocity variation w...
By means of the 2-D simplified model，the dynamic process of the exploding tube of MFCG is simulated. The simulation results show that the expanding angle can be varied with the radial position(or different time) due to the radial velocity variation w...
2007,
19.
Abstract:
A cyclotron was designed using the 2.5 dimensional particle simulation code KARAT in the paper. Transverse momentum of the electrons was imparted by a kicker. By using intense coupling and optimized length of the interaction space, the device could g...
A cyclotron was designed using the 2.5 dimensional particle simulation code KARAT in the paper. Transverse momentum of the electrons was imparted by a kicker. By using intense coupling and optimized length of the interaction space, the device could g...
2007,
19.
Abstract:
The effects of the plasma generated from the air ionzation on the output characteristic of microwave are given. Keeping the external wave constant, the diode current increases, the diode voltage decreases, and the microwave frequency decreases with t...
The effects of the plasma generated from the air ionzation on the output characteristic of microwave are given. Keeping the external wave constant, the diode current increases, the diode voltage decreases, and the microwave frequency decreases with t...
2007,
19.
Abstract:
The cutoff characteristic of waveguide is theoretically analysed in this paper, as well as the feasibility and accuracy in measuring the output power of HPM using the characteristic. It was used to measure the output microwave power of a magnetically...
The cutoff characteristic of waveguide is theoretically analysed in this paper, as well as the feasibility and accuracy in measuring the output power of HPM using the characteristic. It was used to measure the output microwave power of a magnetically...
2007,
19.
Abstract:
A new kind of slow-wave circuit, tunnelplane, is put forward. The tunnelplane circuit was similar to tunneladder slow-wave circuit, but the support between the ring and the metal wall is a metal plane. The tunnelplane was analyzed by field method. Th...
A new kind of slow-wave circuit, tunnelplane, is put forward. The tunnelplane circuit was similar to tunneladder slow-wave circuit, but the support between the ring and the metal wall is a metal plane. The tunnelplane was analyzed by field method. Th...
Primary study on spatial powers combining of parallel and intersectant beams of high power microwave
2007,
19.
Abstract:
Considering that the phases are hard to controll accurately for the high power microwaves, the spatial powers combining of both parallel beams and intersectant beams is investigated. It is concluded that when a small solid angles range adjacent to th...
Considering that the phases are hard to controll accurately for the high power microwaves, the spatial powers combining of both parallel beams and intersectant beams is investigated. It is concluded that when a small solid angles range adjacent to th...
2007,
19.
Abstract:
In this paper, the finite-difference time-domain(FDTD) method was employed to simulate the linear coupling processes of the microwave pulse into the nested cylindrical cavities system with narrow rectangular slots. The influence of the position of th...
In this paper, the finite-difference time-domain(FDTD) method was employed to simulate the linear coupling processes of the microwave pulse into the nested cylindrical cavities system with narrow rectangular slots. The influence of the position of th...
2007,
19.
Abstract:
With the 2.5D fully electromagnetic particle-in-cell code, a P-band hybrid magnetically insulated transmission line oscillator(MILO) was proposed and investigated by using the advantages of both tapered MILO and load-limited MILO. For the hybrid MILO...
With the 2.5D fully electromagnetic particle-in-cell code, a P-band hybrid magnetically insulated transmission line oscillator(MILO) was proposed and investigated by using the advantages of both tapered MILO and load-limited MILO. For the hybrid MILO...
2007,
19.
Abstract:
The small-signal theory of the gyro-TWT, a pinch-point analysis based on the theory of Briggs and Bers combining the cold analysis of the dielectric-loaded waveguide are employed to analysis the threshold current of the operating mode and critical os...
The small-signal theory of the gyro-TWT, a pinch-point analysis based on the theory of Briggs and Bers combining the cold analysis of the dielectric-loaded waveguide are employed to analysis the threshold current of the operating mode and critical os...
2007,
19.
Abstract:
The analysis uses the mode-matching technique to generate a parameter matrix which can be cascaded for computing the resonant frequency and Q value of a complex cavity consisting of a series of waveguide sections is introduced. Program was designed t...
The analysis uses the mode-matching technique to generate a parameter matrix which can be cascaded for computing the resonant frequency and Q value of a complex cavity consisting of a series of waveguide sections is introduced. Program was designed t...
2007,
19.
Abstract:
The generalized expression of Fermat’s principle is introduced through defining generalized refractive index on the basis of the comparison of the definition between left handed materials(LHMs) and right handed materials(RHMs). The concrete expressio...
The generalized expression of Fermat’s principle is introduced through defining generalized refractive index on the basis of the comparison of the definition between left handed materials(LHMs) and right handed materials(RHMs). The concrete expressio...
2007,
19.
Abstract:
The gyroklystron is a high power, high gain, and high efficiency millimeter wave amplifier. Its circuit usually comprises of 4 or 3 stagger-tuned cavities. The input coupler is the first cavity of the circuit and must exhibit reasonable coupling stre...
The gyroklystron is a high power, high gain, and high efficiency millimeter wave amplifier. Its circuit usually comprises of 4 or 3 stagger-tuned cavities. The input coupler is the first cavity of the circuit and must exhibit reasonable coupling stre...
2007,
19.
Abstract:
Resonant condition of this new cavity resonator is different from that of the traditional cavity resonators for its total phase shift need not be a positive integral multiple of 180°. The left-handed transmission line(LHTL) which can realize a negati...
Resonant condition of this new cavity resonator is different from that of the traditional cavity resonators for its total phase shift need not be a positive integral multiple of 180°. The left-handed transmission line(LHTL) which can realize a negati...
2007,
19.
Abstract:
The power capacity of a 36-element high power helical array antenna fed from double-layered radial waveguide is investigated. Two breakdown conditions are discussed, which are breakdown under vacuum condition and breakdown on the medium surface. Base...
The power capacity of a 36-element high power helical array antenna fed from double-layered radial waveguide is investigated. Two breakdown conditions are discussed, which are breakdown under vacuum condition and breakdown on the medium surface. Base...
2007,
19.
Abstract:
In design of the waveguide-stripline-coaxial line directional coupler, the solution of the field distribution in the stripline is essential. Using the Schwarz-Christoffel transformation function, the perfect stripline is transformed into a parallel-p...
In design of the waveguide-stripline-coaxial line directional coupler, the solution of the field distribution in the stripline is essential. Using the Schwarz-Christoffel transformation function, the perfect stripline is transformed into a parallel-p...
2007,
19.
Abstract:
According to demand of the double anode magnetron injection gun for gyroklystron amplifier, many factors influencing electron gun performance, such as electrode shape, magnetic distribution, beam current, first anode voltage, second anode voltage, we...
According to demand of the double anode magnetron injection gun for gyroklystron amplifier, many factors influencing electron gun performance, such as electrode shape, magnetic distribution, beam current, first anode voltage, second anode voltage, we...
2007,
19.
Abstract:
The propagation of high power microwave (HPM) can produce nonlinear effect in lower ionosphere. In this paper, the analytical interaction effect of HPM in lower ionosphere, and the relation of interaction factor with the initial electric field and mi...
The propagation of high power microwave (HPM) can produce nonlinear effect in lower ionosphere. In this paper, the analytical interaction effect of HPM in lower ionosphere, and the relation of interaction factor with the initial electric field and mi...
2007,
19.
Abstract:
A novel mode converter with slow-wave structures is investigated. The circular waveguide is separated into two regions by a metal plate. One is a regular 180° sector waveguide, the other is inserted with slow-wave structures. The input circular TM01 ...
A novel mode converter with slow-wave structures is investigated. The circular waveguide is separated into two regions by a metal plate. One is a regular 180° sector waveguide, the other is inserted with slow-wave structures. The input circular TM01 ...
2007,
19.
Abstract:
The electric-magnetic vibrator combined ultrawideband antenna consist of three parts: feed-in system,TEM horn radiation unit and current loop radiation unit. Applying CST electromagnetic software, the relation between physical structure and port S pa...
The electric-magnetic vibrator combined ultrawideband antenna consist of three parts: feed-in system,TEM horn radiation unit and current loop radiation unit. Applying CST electromagnetic software, the relation between physical structure and port S pa...
2007,
19.
Abstract:
The carbon-fiber cathode with CsI was substituted for the stainless steel cathode in the reflex triode virtual cathode oscillator experimental device. The carbon-fiber cathode vircator output microwaves with pulse width over 200 ns, which was about 3...
The carbon-fiber cathode with CsI was substituted for the stainless steel cathode in the reflex triode virtual cathode oscillator experimental device. The carbon-fiber cathode vircator output microwaves with pulse width over 200 ns, which was about 3...
2007,
19.
Abstract:
In order to study the basic physical process and energy conversion mechanism of helical magnetic flux compression generators (HMFCG) of the two-stage cylinder-taper configuration, a series of HMFCG models were simulated and analyzed using the code MF...
In order to study the basic physical process and energy conversion mechanism of helical magnetic flux compression generators (HMFCG) of the two-stage cylinder-taper configuration, a series of HMFCG models were simulated and analyzed using the code MF...
2007,
19.
Abstract:
In order to research Dense Plasma Focus device (DPF), a kind of scintillation neutron detector is introduced in this paper. The detector consists of a ST401-plastic scintillation and a XP2262B-photoelectric electron-multiplier tube. With a silver act...
In order to research Dense Plasma Focus device (DPF), a kind of scintillation neutron detector is introduced in this paper. The detector consists of a ST401-plastic scintillation and a XP2262B-photoelectric electron-multiplier tube. With a silver act...
2007,
19.
Abstract:
In the experiment of gas laser pumped by electron beam, large area uniform electron beam is important to generate high efficiency laser output. The experimental study on generation of large area uniform electron beam with SPG-200 pulsed power generat...
In the experiment of gas laser pumped by electron beam, large area uniform electron beam is important to generate high efficiency laser output. The experimental study on generation of large area uniform electron beam with SPG-200 pulsed power generat...
2007,
19.
Abstract:
ν/γ is an important physical parameter. ν，γ, are the Budker parameter and the relativistic mass factor, respectively. In this paper, its basic physical sense is expounded from three aspects of Lawson and Humphries formula and energy storage in intens...
ν/γ is an important physical parameter. ν，γ, are the Budker parameter and the relativistic mass factor, respectively. In this paper, its basic physical sense is expounded from three aspects of Lawson and Humphries formula and energy storage in intens...
2007,
19.
Abstract:
The 3.5 MeV foilless injector is the electron source of dragon-Ⅰ linear induction accelerator(LIA). In beam tuning, the variety range of magnetic field is approximately determined by simulation. Based on the beam current waveforms at injector exit, t...
The 3.5 MeV foilless injector is the electron source of dragon-Ⅰ linear induction accelerator(LIA). In beam tuning, the variety range of magnetic field is approximately determined by simulation. Based on the beam current waveforms at injector exit, t...
2007,
19.
Abstract:
The physical mechanism for producing keV level X-radiation via high power Z-pinch and a two-level model for K-shell radiation scaling of the imploding Z-pinch plasma were investigated, and the results of the numerical simulation by the two-level mode...
The physical mechanism for producing keV level X-radiation via high power Z-pinch and a two-level model for K-shell radiation scaling of the imploding Z-pinch plasma were investigated, and the results of the numerical simulation by the two-level mode...
2007,
19.
Abstract:
The operation principle of integral construction of Tesla transformer and PFL was investigated in Tesla-transformer-type accelerator. Experiment was carried out on Tesla transformer’s secondary winding to study the impulse voltage distribution while ...
The operation principle of integral construction of Tesla transformer and PFL was investigated in Tesla-transformer-type accelerator. Experiment was carried out on Tesla transformer’s secondary winding to study the impulse voltage distribution while ...
2007,
19.
Abstract:
A method based on Creedon’s laminar flow theory is got to predict MITL operating point changing, which is resulted from the so called electron re-trapping. The method gives exact numerical solutions for MITL total current, cathode current and voltage...
A method based on Creedon’s laminar flow theory is got to predict MITL operating point changing, which is resulted from the so called electron re-trapping. The method gives exact numerical solutions for MITL total current, cathode current and voltage...
2007,
19.
Abstract:
The synchronizer trigger system of Flash Ⅱ accelerator gas switch is designed and debugged. The system is composed of a synchro-control and a high voltage pulse generator, and the process includes the selection of synchronizer signal, filter, fast co...
The synchronizer trigger system of Flash Ⅱ accelerator gas switch is designed and debugged. The system is composed of a synchro-control and a high voltage pulse generator, and the process includes the selection of synchronizer signal, filter, fast co...
2007,
19.
Abstract:
The high power pulse technology, which is used in the ionic excimer, excimer and soft X-ray lasers, is introduced. The electrical parameters required by the three types of lasers are given respectively. In order to obtain soft X-ray laser, ten-stage ...
The high power pulse technology, which is used in the ionic excimer, excimer and soft X-ray lasers, is introduced. The electrical parameters required by the three types of lasers are given respectively. In order to obtain soft X-ray laser, ten-stage ...
2007,
19.
Abstract:
The measurement on the static breakdown voltages for two kinds of pseudospark switches with different electrode structures is presented. A newly designed pseudospark switch with two electrodes of 1 mm-wide annular slots was tested. Comparing the expe...
The measurement on the static breakdown voltages for two kinds of pseudospark switches with different electrode structures is presented. A newly designed pseudospark switch with two electrodes of 1 mm-wide annular slots was tested. Comparing the expe...
2007,
19.
Abstract:
For a high current diode composed of a small disk type ceramic insulator water/vacuum interface, the design of radial insulation structure is presented. According to the theory of vacuum flashover and the design rules for radial insulation, a “cone-c...
For a high current diode composed of a small disk type ceramic insulator water/vacuum interface, the design of radial insulation structure is presented. According to the theory of vacuum flashover and the design rules for radial insulation, a “cone-c...
2007,
19.
Abstract:
This paper studies the pulsed magnetizing property of annealing metglass and silicon steel core with polymer foil between layers fitted to the linear transformer driver(LTD). The capacitor fast discharge method was used to acquire a pulse with about ...
This paper studies the pulsed magnetizing property of annealing metglass and silicon steel core with polymer foil between layers fitted to the linear transformer driver(LTD). The capacitor fast discharge method was used to acquire a pulse with about ...
2007,
19.
Abstract:
Surface flashover switch have been investigated as a low inductance, low pulsed rate and low jitter command triggered switch. The development and mechanism of surface flashover switch are introduced in this paper. Experiments was carried out to study...
Surface flashover switch have been investigated as a low inductance, low pulsed rate and low jitter command triggered switch. The development and mechanism of surface flashover switch are introduced in this paper. Experiments was carried out to study...
2007,
19.
Abstract:
A high voltage pulse source with 300 kV peak voltage and less than 3 ns risetime was developed. The peaking circuit which consists of a peaking capacitor and an output switch is the key part of this source. The primary requirement of the peaking circ...
A high voltage pulse source with 300 kV peak voltage and less than 3 ns risetime was developed. The peaking circuit which consists of a peaking capacitor and an output switch is the key part of this source. The primary requirement of the peaking circ...
2007,
19.
Abstract:
Two surface discharge radiation sources with slope structure and plane structure respectively are introduced. The discharge characteristics of these two sources were studied with 1.0 μF and 1.5 μF storage capacitance and 15~30 kV charging voltage. Fr...
Two surface discharge radiation sources with slope structure and plane structure respectively are introduced. The discharge characteristics of these two sources were studied with 1.0 μF and 1.5 μF storage capacitance and 15~30 kV charging voltage. Fr...
2007,
19.
Abstract:
In this paper, the output voltage on a resistive load of a capacitor discharging circuit is numerically calculated based on Rompe-Weizel's formula for spark dynamic resistance. With the same electrical parameters, the calculated peak voltage is 54 kV...
In this paper, the output voltage on a resistive load of a capacitor discharging circuit is numerically calculated based on Rompe-Weizel's formula for spark dynamic resistance. With the same electrical parameters, the calculated peak voltage is 54 kV...
2007,
19.
Abstract:
In this paper a Blumlein line in folded parallel-plates configuration using Kapton film as dielectrics is investigated. The characteristic parameters of this Blumlein line were analyzed theoretically, and the electromagnetic field distribution and th...
In this paper a Blumlein line in folded parallel-plates configuration using Kapton film as dielectrics is investigated. The characteristic parameters of this Blumlein line were analyzed theoretically, and the electromagnetic field distribution and th...
2007,
19.
Abstract:
A rep-rate fast pulse hard X-ray generator is developed. The specialties in principle and structure is described, and the experiment parameters of running voltage, current and X-ray radiation field are measured and analyzed. The stability of the sour...
A rep-rate fast pulse hard X-ray generator is developed. The specialties in principle and structure is described, and the experiment parameters of running voltage, current and X-ray radiation field are measured and analyzed. The stability of the sour...
2007,
19.
Abstract:
This article describes the design and performance of a rep-frequency pulsed-current source. The scheme for rep-frequency pulse current source is based on the new type reversely switching dynistor(RSD). The pulsed-current source, which mainly consists...
This article describes the design and performance of a rep-frequency pulsed-current source. The scheme for rep-frequency pulse current source is based on the new type reversely switching dynistor(RSD). The pulsed-current source, which mainly consists...
