Ponente
Descripción
Charged particles traveling through a carbon nanotube can excite electromagnetic modes in the electron gas confined within the cylindrical graphene shell that forms the nanotube wall. This mechanism has recently been proposed as a promising approach for short-wavelength, high-gradient particle acceleration. In this work, we revisit the theoretical framework based on a linearized hydrodynamic model describing the response of a single-walled carbon nanotube (SWNT) to a localized point charge. In the model, the electron gas is treated as a plasma, incorporating solid-state effects through additional terms in the momentum equation. The system of governing equations, comprising the continuity and momentum equations, is coupled with Maxwell’s equations, and the resulting differential equations are solved using a modified Fourier-Bessel transform. We analyze the plasma modes capable of generating a longitudinal electric wakefield component suitable for accelerating trailing particles. Numerical simulations are presented to explore how parameters such as the damping factor, the driver velocity, nanotube radius, and particle position affect the excited wakefields. Finally, we assess the strengths and limitations of this theoretical model in capturing the key features of CNT-based acceleration mechanisms.
