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We present two algorithmic improvements to enhance accuracy for large-signal simulations of vacuum electronic amplifiers using the GPU-accelerated, 3D time-domain particle-in-cell code “Neptune”. A new conformal (cut-cell) geometry model with a new algorithm for Ohmic surface loss accurately predicts the dispersive and dissipative electromagnetic properties of complex metal device structures.
This paper discusses effect of design parameters of liquid cooled CCTWT collector on its thermal performance. Design parameters like collector thickness, cooling channel aspect ratio, Coolant flow rate, channel width, channel height, fin width and number of channels are used to derive analytical model and demonstrate effect of individual parameter on Collector thermal performance. This Analytical...
Results are reported from a comprehensive study of the dispersive properties of serpentine and folded waveguide circuits. The dependence of various features of the dispersion on geometrical parameters is illustrated. Comparisons with predictions of a model circuit consisting of a periodically loaded transmission line are presented.
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.
One-dimensional (SUNRAY-1D), and two and half dimensional (SUNRAY-2.5D) codes are developed for accurate, fast and reliable multi-signal large signal analysis of a complete helix-type space TWT. Detailed beam and rf field parameters including inter-modulation components and higher-order time harmonics are simulated accurately for a high efficiency space TWT. The spent electron beam data of SUNRAY-2...
We report on the incorporation of a model of field emitters based on a Point Charge Model (PCM) that allows for rapid and analytical representations of tip current, variation, and emission statistics and its implementation and usage in the MICHELLE Particle-In-Cell (PIC) code to model the impact of emission variation on current characteristics and emittance. Rather than cold field emission characterized...
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