Electron guiding in macroscopic borosilicate capillaries with large bending angles

Nguyen, Hai-Dang; Wulfkühler, Jan-Philipp; Heisig, Jörg

doi:10.1038/s41598-021-87156-4

Cited by 6 publications

(3 citation statements)

References 28 publications

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“…Additionally, it has been demonstrated that dielectric capillaries can transmit ion beams without any change in both the ion kinetic energy and the ion charge [66]. Capillary guiding peculiarities have been also studied for electron beams, revealing similar elastic and inelastic features of scattering by the inner capillary surface, while a time evolution of transmitted intensity for electrons remains essentially different from that of ions [67][68][69][70][71][72][73][74][75][76][77].…”

Section: Introductionmentioning

confidence: 99%

Surface Channeling of Charged and Neutral Beams in Capillary Guides

Dabagov

Dik

2022

QuBS

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In this review work, the passage of charged and neutral beams through dielectric capillary guides is described from a uniform point of view of beams channeling in capillaries. The motion of beams into the hollow channels formed by the inner walls of capillaries is mainly determined by multiple small-angle scattering (reflection) and can be described in the approximation of surface channeling. It is shown that the surface interaction potential in the case of micro- and nano-capillaries is actually conditioned by the curvature of the reflecting surface. After presenting the analysis of previously performed studies on X-rays propagation into capillaries, which is valid for thermal neutrons, too, the surface channeling formalism is also developed for charged particle beams, in particular, moving in curved cylindrical capillaries. Alternative theories explaining experimental results on the beams passage through capillaries are based on simple thermodynamic estimates, on various diffusion models, and on the results of direct numerical simulations as well. Our work is the first attempt to explain the effective guiding of a charged beam by a capillary from the general standpoint of quantum mechanics, which made it possible to analytically explore the interaction potential for surface channeling. It is established that, depending on the characteristics of a projectile and a dielectric forming the channel, the interaction potential can be either repulsive or attractive; the limiting values of the potential function for the corresponding cases are determined. It has been demonstrated that the surface channeling behaviour can help in explaining the efficient capillary guiding for radiations and beams.

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Section: Introductionmentioning

confidence: 99%

Surface Channeling of Charged and Neutral Beams in Capillary Guides

Dabagov

Dik

2022

QuBS

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“…The effect of controlling electron beams with an energy up to 10 keV by dielectric channels have been actively investigated since 2007 [1,2]. At present, there is a large amount of experimental data on investigating the grazing interaction of electrons with an energy up to 20 keV with dielectric surfaces [3][4][5][6][7][8][9][10]. However, to date, there is no unambiguous answer to the question of the mechanism of such an interaction: whether the control effect is a consequence of the scattering of electrons at surface atoms, or whether self-consistent dynamic charge distribution on the surface of the dielectric sample acts as a determining factor as in the case of ions [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Control of a Fast-Electron Beam using a Ceramic Channel

et al. 2021

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The possibility of controlling charged-particle beams by the use of dielectric channels (guiding) is an urgent task because of the potential of developing inexpensive autonomous controlling and focusing devices. At present, experiments with the use of ions with an energy on the order of MeV are intended for the application of radiation with a spot size of about one micrometer for material analysis, surface modification, and cell surgery. In the case of using electron beams, such a possibility is still under study. In this work, the possibility of controlling a beam of accelerated electrons by using a ceramic channel in the case of its inclination both in the vertical and in horizontal planes is demonstrated. Data about the control are obtained for the channel after irradiation of both its end faces for no less than 5 h. After such treatment, an inhomogeneous carbon-containing deposit is formed on the interior surface of the channel near its end faces. It is demonstrated that the formed deposit has no influence on the guiding properties of the channel.

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“…绝缘微管造价低廉、体积小, 并且带电粒子在其中通过自组织调节的充电过程传输而不需要额外的供能设备. 因此, 除正离子外, 负离子 [17][18][19][20] 、电子 [21][22][23][24][25][26][27][28][29][30][31][32] 、正电子 [33,34] 、μ子 [35,36] 等各种不同性质的带电粒子在绝缘微管中输运机制的研究也被广泛开展.…”

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Production and measurement of MeV proton microbeams in atmospheric environment based on glass capillary

Wan,

Pan,

Zhu

et al. 2024

Acta Phys. Sin.

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The production of the ion microbeam is traditionally by focusing or/and collimating to reduce the size of the beam to submicron meter scale. The traditional setup for the production of the microbeam consists of an expensive focusing and collimating system with a large space, based on electromagnetic fields. Meanwhile, the microbeam obtained through pure collimation by metal micro-tubes is limited by the fabrication processing, i.e., the beam spot size is very much limited by it in the scale of several microns and it is fabricated not as simple as that of a glass capillary. The use of inexpensive and easy-to-make glass capillaries as the tool for ion external microbeam production has become a new direction, inspired by early research on guiding effects. In this work, we used a glass capillary with the open outlet (108 μm in diameter), serving as a vacuum differential and collimating component, to produce a 2.5 MeV-proton microbeam directly into the atmosphere from the linear accelerator for the measurements. We measured the beam spot diameter and energy distribution of the microbeam as a function of the tilt angle of the capillary. We also conducted calculations and ion trajectory analysis on the scattering process of 2.5 MeV protons on the inner walls. The measurement results show that when the tilt angle is around 0°, there are a direct transmission part maintaining the initial incident energy, and a scattering part with the energy loss in the microbeam. It is found that the proportion of the directly transmitted protons and the beam spot size are at maximum around the tilt angle of zero. As the tilt angle increases, the beam spot diameter decreases; when the tilt angle is greater than the geometric angle, all the microbeam are from the scattering with the energy loss. The simulation combined with the ion trajectory analysis based on the scattering process explained the experimental results. It is found that the large angle scattering determines the overall external microbeam spot, while the central region of the beam spot is composed of directly penetrating ions, and its size is determined by the geometry of the glass capillary, i.e., the outlet diameter and the aspect ratio. The easy and inexpensive production of the external microbeam by glass capillaries has the nature benefits for its relative safe and stable operation, and the last but not least point is the simple positioning of the microbeam to the sample without the complex diagnostic tools. It is expected to be widely used in radiation biology, medicine, materials and other fields.

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Electron guiding in macroscopic borosilicate capillaries with large bending angles

Cited by 6 publications

References 28 publications

Surface Channeling of Charged and Neutral Beams in Capillary Guides

Surface Channeling of Charged and Neutral Beams in Capillary Guides

Effect of Control of a Fast-Electron Beam using a Ceramic Channel

Production and measurement of MeV proton microbeams in atmospheric environment based on glass capillary

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