Modulation and trapping of a test beam in a traveling wave tube

For wave-particle interaction studies, the paradigmatic 1D beam-plasma system can be advantageously replaced by a Traveling Wave Tube (TWT). We consider the case when the cold beam intensity is low enough to ensure that instabilities are ruled out. This allows to carefully study the interaction of a beam of essentially test electrons with a single wave propagating in the TWT. By recording the test beam energy distribution at the output of the tube, we report the experimental observation of the velocity modulation and synchronization of a non-resonant beam and of the beam trapping by a resonant wave.

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