In recent years, people are dedicated to the research work of finding compact THz sources with high emission power. Smith-Purcell radiation is qualified for the possibility of coherent enhancement due to the effect of...In recent years, people are dedicated to the research work of finding compact THz sources with high emission power. Smith-Purcell radiation is qualified for the possibility of coherent enhancement due to the effect of FEL mechanism. The compact experiment device is expected to produce hundreds mW level THz ray. The electron beam with good quality is provided under the optimized design of the electron gun. Besides, the grating is designed as an oscillator without any external feedbacks. While the beam passes through the grating surface, the beam bunching will be strong and the second harmonics enhancement will be evident, as is seen from the simulation results.展开更多
In recent years,people are looking for a new compact THz source with high emission power,one potential choice is to build small accelerator with Smith-Purcell radiation.The main difficulty is how to obtain high qualit...In recent years,people are looking for a new compact THz source with high emission power,one potential choice is to build small accelerator with Smith-Purcell radiation.The main difficulty is how to obtain high quality electron beam.In this paper,the beam dynamics design of a compact THz source is presented.The electron beam is produced by an electron gun and compressed by permanent magnets.The electron gun is similar to the Shanghai EBIT,but permanent magnets are used,instead of the superconducting magnets in Shanghai EBIT.With this design,we can reduce the size and cost of the whole device.Poisson/Pandira was employed to simulate and optimize the magnetic field.Egun was used to simulate the beam trajectories from the electron gun to the collector.Within 2 centimeters around the center of longitudinal magnetic field,the calculation showed that the beam satisfies to our design aim.展开更多
文摘In recent years, people are dedicated to the research work of finding compact THz sources with high emission power. Smith-Purcell radiation is qualified for the possibility of coherent enhancement due to the effect of FEL mechanism. The compact experiment device is expected to produce hundreds mW level THz ray. The electron beam with good quality is provided under the optimized design of the electron gun. Besides, the grating is designed as an oscillator without any external feedbacks. While the beam passes through the grating surface, the beam bunching will be strong and the second harmonics enhancement will be evident, as is seen from the simulation results.
文摘In recent years,people are looking for a new compact THz source with high emission power,one potential choice is to build small accelerator with Smith-Purcell radiation.The main difficulty is how to obtain high quality electron beam.In this paper,the beam dynamics design of a compact THz source is presented.The electron beam is produced by an electron gun and compressed by permanent magnets.The electron gun is similar to the Shanghai EBIT,but permanent magnets are used,instead of the superconducting magnets in Shanghai EBIT.With this design,we can reduce the size and cost of the whole device.Poisson/Pandira was employed to simulate and optimize the magnetic field.Egun was used to simulate the beam trajectories from the electron gun to the collector.Within 2 centimeters around the center of longitudinal magnetic field,the calculation showed that the beam satisfies to our design aim.
