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Wave-particle interaction investigated in a travelling wave tube

机译：行波管中的波粒相互作用研究

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For wave-particle interaction studies, the one-dimensional beam-plasma system can be advantageously replaced by a travelling wave tube (TWT). This allowed us to carefully check the saturation mechanisms by the trapping of a cold electron beam, or by diffusion in the broad spectrum excited by a warm beam. While the former case is well understood, the latter case raises the question of the unsolved quasilinear paradox. When the beam intensity is low enough to ensure that beam-plasma instabilities are ruled out, a beam of test electrons is propagated in the TWT. By recording the test beam energy distribution at the output of the tube, we report the first experimental observation of the resonant domain of a single wave and of the overlap of the resonance domains responsible for the transition to large scale chaos common to many Hamiltonian systems. The fractal structure of phase space associated with this transition can also be explored.
机译：对于波粒相互作用研究，可以用行波管（TWT）代替一维束流等离子体系统。这使我们能够通过捕获冷电子束或通过由热束激发的广谱中的扩散来仔细检查饱和机制。虽然前者很容易理解，但后者却提出了未解决的准线性悖论的问题。当射束强度足够低以确保排除射束等离子体不稳定性时，测试电子束将在TWT中传播。通过记录管输出处的测试光束能量分布，我们报告了单波共振域和共振域重叠的首次实验观察，共振域负责过渡到许多汉密尔顿系统所共有的大规模混沌。也可以探索与此过渡有关的相空间的分形结构。

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