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Radio wave propagation of three types of birdcage transmit/receive radio-frequency (RF) coils (lowpass filter, highpass filter, and bandpass filter configurations) was analysed for mouse body magnetic resonance imaging at main magnetic fields of 1.5, 3.0, 4.7, 7.0, 9.4, and 11.7 T (Larmor frequencies of 63.87, 127.74, 200, 300, 400, and 500 MHz) in terms of magnetic (|B1|) field sensitivity and homogeneity...
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...
Design and analysis of a slow-wave structure (SWS) potentially applicable to high power traveling-wave tube (TWT) amplifiers at millimeter-wave frequencies are presented. The circuit characteristics, including the dispersion relation, are predicted. Hot test particle-in-cell (PIC) simulation results will be described employing VORPAL that is based on the conformal finite difference time domain (CFDTD)...
Design and analysis of a slow-wave structure potentially applicable to high power traveling-wave tube (TWT) amplifiers at millimeter-wave frequencies are presented. The circuit characteristics including dispersion relation is predicted. Hot test particle-in-cell (PIC) simulation results will be described employing VORPAL that is based on the conformal finite difference time domain (CFDTD) method.
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