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- W3100222861 abstract "We propose an unconventional electron gun structure in which the emitter is located on a concave cathode surface with a non-uniform electric field. Such a design violates the intuition that an emitter should place close to a uniform electric field to reduce the velocity spread. The commonly employed design guide based on the adiabatic condition predicts a huge velocity spread of 24%, but the simulation using EGUN code and verified with CST particle studio shows a very low spread of 2.8%. Examining the magnetic moment and the kinetic energy of the beam reveals that the electrons experience a relatively long acceleration process due to the much weak electric field. That's why the non-adiabatic effect matters. In addition to the cyclotron compression and the E$times$B drift, the resonant polarization drift plays a crucial role in reducing the overall velocity spread.Simulations show a decent beam quality with the pitch factor of 1.5 and the transverse velocity spread of 2.8% over a wide range of the magnetic field (7.4-8.0 T) and the beam voltage (12-22 kV) with a high structural tolerance. The promising results with the wide working range enable the development of continuous frequency-tunable gyrotrons." @default.
- W3100222861 created "2020-11-23" @default.
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- W3100222861 date "2020-01-01" @default.
- W3100222861 modified "2023-10-18" @default.
- W3100222861 title "Nonadiabatic Effects on Beam-Quality Parameters for Frequency-Tunable Gyrotrons" @default.
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- W3100222861 doi "https://doi.org/10.1109/ted.2019.2954362" @default.
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