Search

Your search keyword '"Bonatto, Alexandre"' showing total 11 results
Start Over Author "Bonatto, Alexandre" Publication Year Range Last 3 years
11 results on '"Bonatto, Alexandre"'

1. Plasmonic excitations in double-walled carbon nanotubes

Author

Martín-Luna, Pablo, Bonatto, Alexandre, Bontoiu, Cristian, Xia, Guoxing, and Resta-López, Javier

Subjects
Physics - Accelerator Physics, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

The interactions of charged particles moving paraxially in multi-walled carbon nanotubes (MWCNTs) may excite electromagnetic modes. 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 wakefields in double-walled carbon nanotubes (DWCNTs) is studied by means of the linearized hydrodynamic theory. General expressions have been derived for the excited longitudinal and transverse wakefields and related to the resonant wavenumbers which can be obtained from the dispersion relation. In the absence of friction, the stopping power of the wakefield driver, modelled here as a charged macroparticle, can be written solely as a function of these resonant wavenumbers. The dependencies of the wakefields on the radii of the DWCNT and the driving velocity have been studied. DWCNTs with inter-wall distances much smaller than the internal radius may be a potential option to obtain higher wakefields for particle acceleration compared to single-walled carbon nanotubes (SWCNTs)., Comment: arXiv admin note: text overlap with arXiv:2308.08399

Published
2024
Full Text
View/download PDF

5. Excitation of wakefields in carbon nanotubes: A hydrodynamic model approach

Author

Ministerio de Universidades (España), Generalitat Valenciana, Martín-Luna, Pablo, Bonatto, Alexandre, Bontoiu, C., Xia, Guoxing, Resta-López, J., Ministerio de Universidades (España), Generalitat Valenciana, Martín-Luna, Pablo, Bonatto, Alexandre, Bontoiu, C., Xia, Guoxing, and Resta-López, J.

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.

Published
2023

10. An Effective-Density Model for Accelerating Fields in Laser-Graphene Interactions

Author

Bonțoiu, Cristian, Apsimon, Oznur, Bonatto, Alexandre, Kukstas, Egidijus, Resta-López, Javier, Welsch, Carsten, Xia, Guoxing, and Yadav, Monika

Subjects
MC3: Novel Particle Sources and Acceleration Techniques, Accelerator Physics
Abstract

With the advancement of high-power UV laser technology, the use of nanostructures for particle acceleration attracts renewed interest due to its possibility of achieving TV/m accelerating gradients in solid state plasmas. Electron acceleration in ionized materials such as carbon nanotubes and graphene is currently considered as a potential alternative to the usual laser wakefield acceleration (LWFA) schemes. An evaluation of the suitability of a graphene target for LWFA can be carried out using an effective density model, thus replacing the need to model each layer. We present a 2D evaluation of the longitudinal electric field driven by a short UV laser pulse in a multi-layer graphene structure, showing that longitudinal fields of ~5 TV/m are achievable., Proceedings of the 13th International Particle Accelerator Conference, IPAC2022, Bangkok, Thailand

Published
2022
Full Text
View/download PDF

11. Dense Îł -ray emission in two consecutive pulses irradiating near critical density plasma.

Author

Zhao, Yuan, Liu, Jianxun, Xia, Guoxing, and Bonatto, Alexandre

Subjects
PLASMA density, GAMMA rays, ION channels, LASER pulses, LASER beams, LASER-plasma interactions, LASERS
Abstract

We report the overdense electron acceleration and dense gamma ray emission via the use of two continuous laser pulses irradiating near critical density plasma. Thanks to the ion channel formed behind the first laser pulse, the leading laser beam is well focused to a higher intensity. As a result, the noticeable electron re-injection and ion focusing when one laser incident is significantly suppressed in the two-consecutive- lasers scheme, efficiently improved the electron acceleration process. Moreover, owing to the stronger laser field and the higher electron energy, the probability rate of the accelerated electron emitting Îł -rays is considerably enhanced. In this regime, the laser intensity is reduced from 1 Ă— 10 23 to 4 Ă— 10 22 W cmâˆ'2 with the competitive density of generated gamma rays. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results