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The large-signal code TESLA (Telegraphist's Equations Solution for Linear-beam Amplifiers) was originally developed for the analysis and design of klystrons. It has now been applied to the simulations of an extended interaction klystron (EIK) for the first time. Results for the power transfer curve and bandwidth curves computed for a G-band EIK compare well to their measured values. TESLA obtains...
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...
One-dimensional (1D) periodic structures with a localized defect and operating in the mm and sub-mm wavelength ranges can be formed by machining small perturbations on the waveguide's walls. We demonstrate the applicability of such structures for diverse applications: from particle acceleration to materials research. It is shown that the strong field enhancement inside the sizable lattice defect should...
Conventional microwave tubes generally use cylindrical electron beam coaxial to RF interaction circuit for generation or amplification of microwave signals. Many performance limitations these tubes in respect of band width, efficiency, voltage break have been addressed by emerging multi-beam technology which uses several low perveance electron beams in place of single beam used in conventional tubes...
A novel approach of sheet electron beam transport under uniform magnetic field through a tunnel of particular shape and size is described here. The space charge field for rectangular beam trough rectangular tunnel, elliptical beam through rectangular tunnel, elliptical beam through elliptical tunnel is analyzed numerically. This analysis shows that component of space charge field along direction of...
We present results of 3D time-domain simulations of vacuum electron devices performed on high-performance GPU hardware using a new simulation code, NEPTUNE. Electromagnetic field evolution using two techniques is compared. First a GPU implementation of the finite-difference time-domain (FDTD) method is shown to give a 20x reduction in execution time compared to an equivalent CPU code. Second, we demonstrate...
The modelling of magnetrons compared to other tubes is more difficult since it requires 3D modelling rather than a 2D investigation. This is not only due to the geometry which can include complicated details to be modeled in 3D but also due to the interaction process itself: The electric field, magnetic field and particle movement span a 3D space. In this paper3D simulations of a strapped magnetron...
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