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A sheet electron beam source is demonstrated using a line-shape carbon nanotube (CNT) field emitter. The line-shape CNT field emitter shows large emission current under the small applied voltage. Moreover, the emitted electron is well-confined without any focusing lens.
A 9.3 GHz 6 MeV linear accelerator (LINAC) was designed by using three-dimensional (3D) particle-in-cell (PIC) simulations with 3D time-domain electromagnetic simulations. In the 3D PIC simulations, field data of a π/2 standing wave mode extracted from the 3D time-domain field calculations were injected into a side-coupled LINAC composed of 25 acceleration and 24 coupling cavities. Acceleration of...
Research activities for development of a compact and high power terahertz radiation source using a CNT cold cathode are presented. Basic principles of the proposed device and experimental challenges to realize the device are discussed.
Generation of electron bunch from a dc-biased, single surface multipactor was studied theoretically and by PIC simulations. The condition for a spatially narrow bunch was obtained and verified by PIC simulations. This kind of multipactor is proposed to be used as a compact electron gun for various applications, such as linear accelerators.
We formulated a cubic spline trajectory planner with arc-length parameter which is estimated by summing up to the 3rd order in Taylor's expansion. The PVAJT motion planning is presented to reduce trajectory calculation time at every cycle time of servo control loop so that it is able to generate cubic spline trajectory in real time. These method can be used to more complex spline trajectory. We executed...
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