Interaction of proton microbeam with the inner surface of a polytetrafluoroethylene macrocapillary

Rajta, I.; Nagy, Gyula; Bereczky, R J; Tőkési, K.

doi:10.1016/j.nimb.2014.12.042

Cited by 15 publications

(13 citation statements)

References 23 publications

(21 reference statements)

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“…This again agrees well with our previous experimental results (Ref. [17] for 10 pA and Ref. [18] for 100 pA).…”

Section: Spatial Distributions Of the Transmitted Beamsupporting

confidence: 94%

“…It is also evident that some scattered particles are present, although in our former experiments (in Refs. [17,18]) we were not able to detect them. According to our simulation the explanation is as follows: The intensity of the scattered fraction was lower than the detection limit of our experimental setup.…”

Section: Spatial Distributions Of the Transmitted Beammentioning

confidence: 76%

“…In order to gain understanding of the governing processes of MeV ion beam transmission, we started the investigation of the guiding possibility of a 1-MeV proton beam through a single, cylindrical insulating macrocapillary in 2012. After the construction of our experimental setup [15], we proved in a series of work [16][17][18][19], that by using suitable conditions, pure electrostatic guiding of the swift ion beam is indeed possible and observable. These conditions cover a range of parameters, including (i) a material, which has exceptionally high electrical resistance, to be able to store a large amount of electric charge for a long time, (ii) a proper geometry of the capillary target, i.e., large wall thickness to reduce leakage currents through the bulk material, and length to reduce leakage currents along the surface, and (iii) a proper geometrical arrangement, i.e., large distance between the primary charge patch and the electrically grounded electrodes, to increase resistivity.…”

Section: Introductionmentioning

confidence: 99%

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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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“…This again agrees well with our previous experimental results (Ref. [17] for 10 pA and Ref. [18] for 100 pA).…”

Section: Spatial Distributions Of the Transmitted Beamsupporting

confidence: 94%

Section: Spatial Distributions Of the Transmitted Beammentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…The black x's show an interpolation of I offset hold , which from Eqs. (13a), (15), and (17) is approximately the incoming beam intensity, I beam . We see that as the beam is injected into the capillary I beam is larger than I hold + I trans , shown by the magenta stars.…”

Section: B Injected and Transmitted Beam As A Function Of Beam-capilmentioning

confidence: 99%

“…Guiding has been studied using insulating foils like polyethylene-terephthalate (PET) [6,7], using solids such as silicon dioxide (SiO 2 ) [8] and aluminum oxide (Al 2 O 3 ) [9,10], in nanocapillaries with aspect ratios around 100, and in straight plus tapered glass capillaries [11][12][13][14][15][16][17]. Bombarding beams including highly and singly charged ions [1,2,18], electrons [3][4][5]19], and even exotic particles [20,21] have been proposed or tested.…”

Section: Introductionmentioning

confidence: 99%

Charge deposition, redistribution, and decay properties of insulating surfaces obtained from guiding of low-energy ions through capillaries

2019

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We present a combined experimental and theoretical study of the transmission of single charged 1-keV Ar ions through a cylindrical glass capillary of macroscopic dimensions. From quantitative measurements of the incoming and transmitted ion currents, combined with a detailed analysis, the amount of beam entering the capillary was determined. This, combined with the measured transmitted currents, was used to determine the amount of charge deposited on the inner wall of the capillary which produces the guiding electric field. We show experimental results for fully, and partially, discharged conditions of the time evolution of the guided beam intensity following a wide range of times during which the capillary was allowed to discharge in order to provide information about the insulating surface charging and discharging rates. Combining our recent theoretical model describing the charge patch dynamics with these data, it is shown that the model is consistent with the experimental transmission curve data measured after the capillary was allowed to discharge for times ranging from 5 to 1000 s or longer and for injected currents that differed by a factor of 50. In contrast, models which do not include a dynamic rearrangement of charge along the surface prior to decay were found to be inconsistent with our experimental measurements. Additional data about the time dependences of the fraction of the injected beam which is transmitted as a function of injected beam current when transmission through the capillary is inhibited due to blocking are also presented. These data have a temporal dependence consistent with our model predictions that blocking occurs when the total capillary charge, i.e., the capillary potential, reaches a certain value.

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Simulation of the time evolution of 1 MeV proton microbeam transmission through an insulating macrocapillary

Nagy

Szilasi

Rajta

et al. 2017

Nuclear Instruments and Methods in Physics Research Section B:

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Interaction of proton microbeam with the inner surface of a polytetrafluoroethylene macrocapillary

Cited by 15 publications

References 23 publications

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

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

Charge deposition, redistribution, and decay properties of insulating surfaces obtained from guiding of low-energy ions through capillaries

Simulation of the time evolution of 1 MeV proton microbeam transmission through an insulating macrocapillary

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