Channeling of protons through carbon nanotubes

Abstract

Abstract. We investigate how dynamic polarization of carbon valence electrons influences both the angular and spatial distributions of protons channeled in a (11, 9) single-wall carbon nanotube placed in vacuum and in different dielectric media. Proton speeds between 3 and 10 a.u., corresponding to energies of 0.223 and 2.49 MeV, are chosen with the nanotube length varied between 0.1 and 1 µm. In all performed calculations we describe the interaction between proton and carbon atoms on the nanotube wall using the Doyle-Turner potential. The image force on a proton is calculated using a two-dimensional hydrodynamic model for the dynamic response of the nanotube valence electrons and the dielectric media surrounding the nanotube. The angular distributions of channeled protons are generated using a computer simulation method which solves the proton equations of motion in the transverse plane numerically. The best level of ordering and straightening of carbon nanotube arrays is often achieved when they are grown in a dielectric matrix. Consequently, we investigate here how the dynamic polarization of carbon valence electrons in the presence of various surrounding dielectric media affects the angular distributions of protons channeled through (11, 9) single-wall carbon nanotubes. Our analysis shows that the inclusion of the image interaction, gives rise to a number of rainbow maxima in the corresponding angular and spatial distribution. Our analysis shows that the presence of dielectric media surrounding the nanotube influences the positions and appearance of rainbows in the corresponding angular and spatial distributions. In addition, we analyze the possibility of production of nano-sized beams by carbon nanotubes.

Channeling and Radiation in Periodically Bent Crystals

“….1.3.2).bending parameter, 69-70, 74, 180, 201 electron-based, 153, 158, 162, 172-173 feasibility, 8, 9, 104-111, 158-160, 162, 163 heavy projectile, 176 high-energy regime, 101, 102, 104 imperfect, 10, 58-60, 133-135, 194-196 number of periods, 7, 105, 106, 110, 181, 182, 184, 185, 201, 212 optimal length, 127-128 oscillations, 75 parameter, 66-68, 70, 78 perfect, 2 period, 2, 50, 55, 57-58, 70, 71, 109-110, 179, 182, 184-187 positron-based, 56, 80, 104-111, 154 preparation, 9-10, 51-58, 191 Si-Ge, 51-54, 200 Crystalline undulator laser, 5, 209, 233, 234 brilliance, 8, 231 gain, 210, 216-218, 220, 222 Crystalline undulator radiation, 1, 67, 77-79, 107, 116, 118 brilliance, 126, 130, 132, 133, 233 experiment, 192, 197-206 spectral distribution, 117-119, 122, 124, 125, 134, 136, 137, 139, 140 Crystallographic directions, 28 A. V. Korol et al, Channeling and Radiation in Periodically Bent Crystals, 283 Springer Series on Atomic, Optical, and Plasma Physics 69, DOI: 10.1007/978-3-642-54933-5, © Springer-Verlag Berlin Heidelberg 2014 Index E Energy losses, 8, 95, 178, 244 in PBCr, 99, 101 radiative, 95, 97, 99, 100 Equations of motion,30,77,114,214,216,[242][243]247 …”

“…The examples of such materials are nanotubes and fullerites, for which the channeling effects has been also investigated, see, e.g.,[20, 56,77,88,108,112,[297][298][299]. The examples of such materials are nanotubes and fullerites, for which the channeling effects has been also investigated, see, e.g.,[20, 56,77,88,108,112,[297][298][299].…”

Channeling of Protons through Radial Deformed Double Wall Carbon Nanotubes

“…Like in previous investigation with SWNTs [37], we can conclude that the both, spatial and angular distributions are very sensitive to the value of radial strain and nanotube length. Also, they are very sensitive to the value of incidence proton energy [22]. These effect can be used to manipulate proton yields within the nanotube.…”

MBN explorer atomistic simulations of 855 MeV electron propagation and radiation emission in oriented silicon bent crystal: theory versus experiment

“…The dependence calculated by means of the RADCHARM code [44] is presented as well. 4 In Ref. [20], the spectral distributions are presented in arbitrary units, whereas the current simulations produced the absolute values.…”