Wiggler磁场聚焦带状电子注
Focusing sheet electron beam by Wiggler-field
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摘要: 带状电子注在螺线管磁场作用下传输时,易形成Diocotron不稳定性,导致电子注崩溃。采用Wiggler磁场聚焦带状电子注能防止Diocotron不稳定性。研究了Wiggler磁场聚焦带状注的作用机理,得出带状电子注在Wiggler场作用下的包络方程。结合理论分析,使用3维粒子模拟程序对带状电子注的Diocotron不稳定性和Wiggler磁场抑制不稳定性分别进行了模拟。研究表明:合适的选择磁场大小和周期能有效抑制Diocotron不稳定性,使得设计带状电子注行波管成为可能。
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关键词:
- 带状电子注 /
- Wiggler磁场 /
- Diocotron不稳定性 /
- 粒子模拟
Abstract: Transporting in solenoid magnetic fields, sheet electron beams tend to manifest Diocotron instability, which could lead to collapse of beam propagation. Wiggler-field can be used to focus sheet electron beam and prevent Diocotron instability. The theory of the Wiggler-field focusing sheet electron beams was analyzed, and the corresponding beam envelope was gotten. Using 3D PIC program, the formation of Diocotron instability a Wiggler-field focusing sheet electron beam was simulated. Results show that Wiggler-field design, such as increasing the inagnitude and reducing the period properly, would restrain Diocotron instability. This might make the sheat-electron-beam travelling wave tube possible.-
Key words:
- sheet electron beam /
- wiggler-field /
- diocotron instability /
- particle-in-cell
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