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The transport of a rectangular sheet beam in a metamaterial-loaded waveguide has been theoretically studied. It is found from the theoretical analysis that the space-charge field can lead to the beam curling under the uniform axial magnetic focusing. The simulation results also verify the theoretical analysis. This work lays a foundation for developing new vacuum electron devices based on metamaterials.
The radial tunable periodic cusped magnet (RTPCM) focusing system is designed in this paper. It is shown that a radial divergent sheet beam with 1800V, 84.9mA can be transported smoothly through the drift tunnel with height of 0.36mm and length of 18.8mm focused by this RTPCM system.
A 220GHz relativistic backward wave oscillator(RBWO) is studied in this paper. This model consists of four parts, including slow wave structure(SWS), the cathode, the resonant reflector and the output waveguide. The single-grating rectangular waveguide is selected as the SWS. Through dispersion characteristics of the SWS, and the transmission characteristics of the resonant reflector and the output...
The radial divergent sheet beam electron optical system focused by a radial uniform magnetic field is designed in this paper. It is shown that the radial divergent sheet beam with size of 8 deg×0.23 mm, generated by the electron gun with 1700V, 151 mA, can stably pass through the beam drift tunnel with transverse size of 20 deg×0.52 mm and the length of 20 mm in a radial quasi-uniform magnetic field.
In this paper, we have presented the simulation results on sheet beam electron gun and sheet beam transport in a uniform magnetic field. It is shown that the sheet beam with size 4.6 mm×0.4 mm, generated by the electron gun with 20 kV, 560 mA, can stably pass through the beam tunnel with transverse size 6 mm×1 mm and the length 120 mm in a uniform magnetic field.
Stable high-elliptical sheet electron beam transport is an essential technology for an emerging class of high-power high-frequency planar-structure microwave devices. This paper studies on stable sheet beam transport in elliptical solenoid field. First, we investigate the magnetic field of elliptical solenoid. Then, we use 3D PIC simulations investigate the sheet beam transport in the elliptical magnetic...
Stable sheet electron-beam transport is critical for sheet-beam microwave device which is attractive for high-power millimeter wave to terahertz-regime radiation. This paper studies the stable sheet-beam transport in periodic nonsymmetric quadrupole field. First, the conditions for stable round- and sheet-beam transport in periodic magnetic quadrupole field are deduced. In the deduction, we find that...
Under the condition of the solenoid focusing magnetic fields, Diocotron instability easily forms in the sheet electron beam, which could lead to collapse in beam propagation. This formation of Diocotron instability is presented in detail in this paper by using a three dimensional (3D) particle-in-cell (PIC) simulation. Then the Wiggler field is used to focus sheet electron beam, and the simulation...
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