Development of a micro-PIXE system using tapered glass capillary optics

Hasegawa, Jun; Jaiyen, Sarawut; Polee, Chalermpong; Oguri, Y.

doi:10.1016/j.nimb.2011.04.073

Cited by 15 publications

(4 citation statements)

References 6 publications

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“…Since its discovery, charged particle guiding has been of interest, in part to help understand the basic physics of interactions between charged particles and insulating surfaces, but also to investigate whether guiding can be exploited in other areas of research. For example, because guiding can provide an efficient means of beam transport without significant alteration of the beam energy or charge state and without the necessity of applying any external electric or magnetic fields, possible applications range from enhancement of the flux density of exotic particle beams [21], to a method of generating microbeams [27][28][29], to a way to improve spectroscopic or imaging studies [30][31][32][33]. There are also various microbiological applications [34].…”

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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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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“…Although a realistic value of the enhancement factor may be considered to be less than 2, the work of Nebiki et al demonstrated that a tapered glass capillary can be used as a simple microbeam generator to achieve some beam density enhancement. The capillary microbeam method has since been applied to particle induced x-ray emission (PIXE), RBS (Rutherford backscattering spectrometry), and nuclear reaction analysis with various MeV-energy ions [87][88][89][90][91][92][93][94][95][96][97][98]. The RIKEN group has also started to apply capillary microbeam methods to the irradiation of intracellular organelles [99][100][101].…”

Section: Macro-size Capillariesmentioning

confidence: 99%

Ion guiding in macro-size insulating capillaries: straight, tapered, and curved shapes

Kojima¹

2018

J. Phys. B: At. Mol. Opt. Phys.

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When keV energy ions are injected into a tilted insulating capillary, a certain fraction of the injected ions are transported through the tilt angle of the capillary. This ion guiding phenomenon is considered to be caused by a self-organizing charge distribution, where the inner wall of the capillary becomes charged by initial incoming ions. The charge distribution, which is formed, can guide following ions toward the exit of the capillary. Since the initial discovery of this effect, studies of ion guiding by insulating capillaries have been extended to various materials, and different sizes and shapes of capillaries. In recent years, some investigations of the guiding effect of macro-size curved capillaries have also been reported. In this review, relevant studies in a history of ion guiding in curved capillaries are discussed and future directions in this field are considered.

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“…For the latter, no scenario is generally accepted, although several models including the small-angle multiple scattering 18) (a similar process to the surface channeling) 20) and numerous charge patch assisted processes [21][22][23][24][25] have been proposed. Furthermore, the beam guide effect of MeV ions has been applied to in-air analysis processes, such as particleinduced X-ray emission spectroscopy, [32][33][34][35] Rutherford backscattering spectroscopy, 36) single-cell irradiation, 19,37) MeV secondary-ion mass spectrometry with a capillary microprobe, 38) microbeam nuclear reaction analysis, 39) and scanning transmission ion microscopy, 40,41) because mediumenergy proton and helium-ion beams can transmit through air. Furthermore, tapered glass capillaries are generally employed in this case because they can easily focus mediumenergy ion beams with diameters in the mm range to afford those with a diameter in the μm or nm range.…”

Section: Introductionmentioning

confidence: 99%

Fluence enhancement of a 4 MeV-C⁴⁺ ion beam transmitted through a cylindrical glass channel after charging

Motohashi¹,

Miyawaki²,

Narumi³

et al. 2021

Jpn. J. Appl. Phys.

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We have developed a glass channel to guide ions heavier than protons and alpha particles with kinetic energies of several MeVs. The fluence of a 4 MeV-C 4+ ion beam transmitted through the cylindrical glass channel (CGC) was measured by counting the number of etch pits using a CR39 solid-state nuclear track detector. After charge of the CGC using the incident ions with 31 nC, the fluence of the transmitted ions increased by 23%-26% at an angle of 0°with respect to the ion beam axis, compared to that before the charging process. In this case, the kinetic energy of the ions transmitted through the CGC maintained the incident kinetic energy of 4.0 MeV in absence of preceding charge up.

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Development of a micro-PIXE system using tapered glass capillary optics

Cited by 15 publications

References 6 publications

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

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

Ion guiding in macro-size insulating capillaries: straight, tapered, and curved shapes

Fluence enhancement of a 4 MeV-C⁴⁺ ion beam transmitted through a cylindrical glass channel after charging

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Development of a micro-PIXE system using tapered glass capillary optics

Cited by 15 publications

References 6 publications

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

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

Ion guiding in macro-size insulating capillaries: straight, tapered, and curved shapes

Fluence enhancement of a 4 MeV-C4+ ion beam transmitted through a cylindrical glass channel after charging

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Fluence enhancement of a 4 MeV-C⁴⁺ ion beam transmitted through a cylindrical glass channel after charging