Ion-beam focusing by self-organized axis-symmetric potentials in insulating capillaries

Giglio, Eric; Guillous, S.; Cassimi, A.

doi:10.1103/physreva.98.052704

Cited by 19 publications

(36 citation statements)

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“…Based on this model, we developed a numerical code, called InCa4D, which simulates ion trajectories through a cylindrical symmetric capillary. Short overviews about the numerical code are presented in [14,35], where InCa4D was used to demonstrate the ability of insulating conical capillaries to focus the injected ions beam. For this paper, we updated our numerical code so as to take also into account SEs generated at the inner capillary wall by ion impacts.…”

Section: A Assumptions Of the Modelmentioning

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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Section: A Assumptions Of the Modelmentioning

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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“…The transmitted current density j out can be orders of magnitude higher than the current density j in of the injected beam. We call this mechanism the self-organized radial focusing of an ion beam by an insulating tapered capillary, and it was recently investigated by several authors [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, it was shown in a combined experimental and theoretical work that a tapered glass capillary can focus efficiently a 2.3 keV Ar + ion beam if the self-organized potential inside the capillary is able to reach 70% of the extraction potential of the ion source [2]. The authors found a maximum value of f c of about 11 and showed that the latter depends on the intensity of the injected beam.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, with the capillary setup presented in Ref. [2], the blocking of the transmission of the focused beam could not be avoided because the potential in the capillary reached inevitably the extraction potential of the ion source. We refer to the latter as Coulomb blocking.…”

Section: Introductionmentioning

confidence: 99%

“…Beam compression by patches in capillaries was demonstrated using simulations in Refs. [7] and [2], with the latter including a detailed discussion of the involved mechanism. Experimental evidence of transverse compression by tapered capillaries tilted with respect to the beam axis was given in Refs.…”

Section: Introductionmentioning

confidence: 99%

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