|
|
Martin-Luna, P., Bonatto, A., Bontoiu, C., Lei, B. F., Xia, G. X., & Resta-Lopez, J. (2025). Wakefield excitation and stopping power in multi-walled carbon nanotubes: one- and two-fluid model. J. Phys. D, 58(22), 225203–15pp.
Abstract: The motion of charged particles along multi-walled carbon nanotubes (MWCNTs) can induce electromagnetic modes. This wake effect represents an innovative approach for short-wavelength, high-gradient particle acceleration and for producing brilliant radiation sources. This article examines the excitation of wakefields produced by a point-like charge moving parallel to MWCNTs using the linearized hydrodynamic theory. General expressions for the excited longitudinal and transverse wakefields and the stopping power have been derived, relating them to the resonant wavenumbers obtainable from the dispersion relations under the assumption of negligible friction. As the number of walls in MWCNTs increases, they exhibit a richer spectrum of plasmonic excitations, which has been widely studied as a function of the driver velocity in this manuscript. This comprehensive study provides a deeper understanding of the physical phenomena behind plasmonic excitations in MWCNTs, paving the way for potential applications in particle acceleration, nanotechnology, and materials science.
|
|
|
|
Martín-Luna, P., Bonatto, A., Bontoiu, C., Xia, G., & Resta-Lopez, J. (2023). Excitation of wakefields in carbon nanotubes: a hydrodynamic model approach. New J. Phys., 25(12), 123029–12pp.
Abstract: The interactions of charged particles with carbon nanotubes (CNTs) may excite electromagnetic modes in the electron gas produced in the cylindrical graphene shell constituting the nanotube wall. This wake effect has recently been proposed as a potential novel method of short-wavelength high-gradient particle acceleration. In this work, the excitation of these wakefields is studied by means of the linearized hydrodynamic model. In this model, the electronic excitations on the nanotube surface are described treating the electron gas as a 2D plasma with additional contributions to the fluid momentum equation from specific solid-state properties of the gas. General expressions are derived for the excited longitudinal and transverse wakefields. Numerical results are obtained for a charged particle moving within a CNT, paraxially to its axis, showing how the wakefield is affected by parameters such as the particle velocity and its radial position, the nanotube radius, and a friction factor, which can be used as a phenomenological parameter to describe effects from the ionic lattice. Assuming a particle driver propagating on axis at a given velocity, optimal parameters were obtained to maximize the longitudinal wakefield amplitude.
|
|
