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Low-frequency oscillations (LFOs) have been observed in a high average power gyrotron and the trapped electron population contributing to the oscillation has been measured. However, understanding of the LFOs remains incomplete and a full picture of this parasitic phenomenon has not been seen yet. In this work, we use a 3D conformal finite-difference time-domain (CFDTD) particle-in-cell (PIC) method...
The problem of adult and child exposure to uniform plane waves in the frequency range from 900 MHz to 3 GHz, employed by the fixed stations of the most widely used mobile communication systems, is investigated. Anatomically scaled models of a 7-year-old child, a 13-year-old child, and an adult were developed, starting from the visible-human dataset. The dosimetric analysis was performed using a parallel...
This work introduces a conformal finite difference time domain method to accurately and efficiently study photonic crystal (PC) devices such as PC cavities and waveguides. An absorption boundary known as a perfectly matched layer (PML) has been implemented and tested. The results show that the PML can work very well with PC structure simulations. These capabilities will facilitate the simulation and...
Summary form only given. This work introduces a conformal finite-difference time domain (CFDTD) particle-in-cell (PIC) method with improved field emission algorithms to accurately and efficiently study field emission devices. The CFDTD method is based on the Dey-Mittra algorithm or cut-cell algorithm, as implemented in the VORPAL code. Locally distorted cells with edges tangential to the metallic...
The feasibility of designing a multistage depressed collector using conformal finite-difference time-domain particle-in-cell simulations has been studied. A feedback mechanism is implemented to provide stable time-dependent voltages for each stage of the depressed collector. An arbitrary space-time dependent spent beam distribution can be given in our time-domain simulations. We demonstrate the design...
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