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The high-order mode oscillation is studied in designing a four-cavity intense relativistic klystron amplifier(IRKA). The reason of the oscillation caused by high-order modes and a method to suppress this kind of spurious modes are found through theoretical analyses and the study on the influence of major parameters of a high frequency structure (such as, the oscillation frequency of cavities, the...
How to improve the efficiency of the gyrotron is always the focus of attention in studying gyrotron. There are many way to enhance the efficiency of the gyrotron, which are mainly concentrated in two aspects, one is designing the gyrotron with a depressed collector, the another is by changing the cavity structure to improve efficiency. In the paper, we adopt a new cavity structure which can better...
How to improve the efficiency of the gyrotron is always the focus of attention in studying gyrotron. There are many way to enhance the efficiency of the gyrotron, which are mainly concentrated in two aspects, one is designing the gyrotron with a depressed collector, the another is by changing the cavity structure to improve efficiency. In the paper, we adopt a new cavity structure which can better...
Based on the mode-matching technique and simulation software CST, this paper analyzes and simulates the input cavity of gyroklystron amplifier, and gets the structure model of TE01 mode W-band gyroklystron input cavity. Then it contrasts the influence of the size of coupling slots to the coupling frequency and Q-value.
A complex cavity with gradual transition is employed in the 94 GHz gyrotron. A self-consistent field nonlinear theory has been used and numerical simulations for electron beam interaction with RF modes are given. A pulse output power of 235.2 kW is obtained by simulation at a beam voltage of 60 kV with beam current of 10 A, a velocity ratio of 1.45, and magnetic field 17kG, corresponding to an efficiency...
A complex cavity with gradual transition is employed in the W-band gyrotron. A self-consistent field nonlinear theory has been used and numerical simulations for electron beam interaction with RF modes are given. A pulse output power of 212 kW is obtained by simulation at a beam voltage of 60 kV with beam current of 10 A, a velocity ratio of 1.5, and magnetic field 17kG, corresponding to an efficiency...
Cyclotron electron beam provided by magnetron injection gun has a direct impact on the performance of the whole gyro-devices. Based on the initial study and computer simulations, A 10 A single-anode electron gun has been studied and designed according to the requirements of the gyrotron. Calculations have been performed to optimize the electrode shape and the beam parameters. The electron beam with...
In this paper, we improve the trilateral filter for removing the mix of Gaussian and impulse noise. The new algorithm incorporates Rank-Ordered Absolute Differences (ROAD) Statistic for detecting outliers in gradient domain and intensity domain of image with impulse noise. A switching mechanism is adopted in gradient bilateral filter and intensity bilateral filter for smoothing the gradients and intensities...
Avoiding the DOS attack is crucial for wireless local area network (wireless LAN) in ensuring the wireless LAN to work normally. In this paper, a method of detecting and avoiding the Queensland attack is proposed. The method uses the change of the beacon interval to determine whether the attack occurred. Once the attack is detected, the method resets the working channel of the AP, and reboots it....
Based on the quasi-self-consistent field nonlinear theory the simulation software GKER (gyroklystron emulator) was developed for the calculations and simulation of the interaction between electron beam and RF field in gyroklystrons using the union programming technique. This paper mainly discusses the simulation results of the resonators designed for the experimental gyroklystrons using GKER.
A systematic theoretical study of gyroklystrons with a series of abrupt transitions along the axial has been done already. A quasi-self-consistent field nonlinear theoretical investigation and a result of numerical simulation of electron beam interacting with RF field in a gyroklystron are presented in this paper. Parameters of Ka band gyroklystrons were calculated for designs using this theory and...
Open cavity with abrupt changes is generally used in the gyro-oscillators and amplifiers. On the basis of mode-matching technique we present the high frequencies structure analyses code for gyrotron. The code provides a method for computing the resonant frequency and Q value in an open cavity. We present the theory and an example which demonstrates the operation and the possible usage of the code.
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