Simulated transmission of a 1-MeV proton microbeam through an insulating macrocapillary

Liu, S.D.; Stolterfoht, N.; Zhao, Yongtao

doi:10.1016/j.nimb.2019.07.040

Cited by 7 publications

(11 citation statements)

References 26 publications

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“…However, a few experiments with a microbeam of 1 MeV protons [27][28][29] provided evidence of MeV-ion guiding as they showed clear charge-up processes together with a high transmission, which could not be achieved by the atomic scatterings. Recently, several theoretical simulations [30][31][32] reproduced those experimental results. The pioneering simulation by Nagy etal [30,31] adopted two-dimensional (2D) model, where the charge patch deflections and atomic scatterings were both considered.…”

Section: Introductionmentioning

confidence: 75%

“…The pioneering simulation by Nagy etal [30,31] adopted two-dimensional (2D) model, where the charge patch deflections and atomic scatterings were both considered. However, a three-dimensional (3D) model was used in our latest simulation [32], which only included the charge patch deflections. Anyhow, the ultra extension of the charge patch along the capillary length turns out responsible for the MeV-ion guiding [32].…”

Section: Introductionmentioning

confidence: 99%

“…However, a three-dimensional (3D) model was used in our latest simulation [32], which only included the charge patch deflections. Anyhow, the ultra extension of the charge patch along the capillary length turns out responsible for the MeV-ion guiding [32]. Moreover, it reveals that the usual beam of MeV-ions can also be guided through the macrocapillary, different from previous reports [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Simulations of transmission of 1 MeV protons through an insulating macrocapillary

Liu

Zhao

2019

J. Phys. D: Appl. Phys.

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We report the simulated results of 1 MeV protons transmitted through a straight insulating macrocapillary with a diameter of 0.8 mm and a length of 50 mm. In the simulations, the atomic scattering due to collisions with atoms in the capillary bulk and the guiding caused by the charge patch are both considered. The simulation results indicated a charge-up process in the macrocapillary, leading to a guided transmission. Some transmitted protons suffered significant energy losses due to the atomic scatterings. A temporal evolution of the transmitted proton fraction is shown. The fractions with the tilt angle Ψ can be well described by the exponential function e −Ψ ξ . Altogether, the results reveal that the transmission of 1 MeV protons through a macrocapillary is determined by both the guiding and scattering. In the case of smaller angles, the MeV-ion transmission is mainly governed by the guiding. However, the scattering becomes more important as the tilt angle increases.

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Section: Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulations of transmission of 1 MeV protons through an insulating macrocapillary

Liu

Zhao

2019

J. Phys. D: Appl. Phys.

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“…Recently, Liu et al investigated the transmission features of a 1-MeV H + beam through a straight, cylindrical insulating macrocapillary, using their own computer simulation code. Beyond the good reproduction of our main conclusions using a microfocused beam, they pointed out the importance of beam divergence [22]. They also investigated the transmission of a parallel macrosized beam, and found partial transmission, but still partly due to electrostatic deflection.…”

Section: Introductionmentioning

confidence: 64%

Spatial and temporal distribution of a 1-MeV proton microbeam guided through a poly(tetrafluoroethylene) macrocapillary

et al. 2021

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We present computer simulations about the spatial and temporal evolution of 1 MeV proton microbeam transmitted through an insulating macrocapillary with the length of 45 mm and with the inner diameter of 800 μm. The axis of the capillary was tilted to 1° relative to the axis of the incident beam, which ensured geometrical non-transparency. The simulation is based on the combination of stochastic (Monte-Carlo) and deterministic methods. It involves 1) random sampling of the initial conditions, according to distributions generated by the widely used and freely available computer software packages, SRIM and WinTRAX, 2) the numerical solution of the governing equations for following the classical trajectory of the projectiles, and 3) the description of the field-driven charge migration on the surface and in the bulk of the insulator material. We found that our simulation describes reasonably all of our previous experimental observations, indicating the functionality and reliability of the applied model. In addition, we found that at different phases of the beam transmission, different atomic processes result in the evolution of the beam distribution. First, in a scattering phase, the multiple small angle atomic scattering dominates in the beam transmission, resulting an outgoing beam into a wide angular range and in a wide energy window. Later, in a mixed phase, scattering and guiding happens simultaneously, with a continuously increasing contribution of the guiding. Finally, in the phase of the stabilized, guided transmission, a quadrupole-like focusing effect is observed, i.e. the transmitted beam is concentrated into a small spot, and the transmitted protons keep their initial kinetic energy.

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“…therein). Known theoretical studies mainly aim at simulating the motion of charged particle beams inside capillary insulators using either the Monte Carlo method or direct numerical calculations [60,64,65,[86][87][88][89][90]. Alternative theories on the motion of charged beams in both macro-and micro-capillaries are based on simple thermodynamic estimates within common diffusion models.…”

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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Simulated transmission of a 1-MeV proton microbeam through an insulating macrocapillary

Cited by 7 publications

References 26 publications

Simulations of transmission of 1 MeV protons through an insulating macrocapillary

Simulations of transmission of 1 MeV protons through an insulating macrocapillary

Spatial and temporal distribution of a 1-MeV proton microbeam guided through a poly(tetrafluoroethylene) macrocapillary

Surface Channeling of Charged and Neutral Beams in Capillary Guides

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