Production of a microbeam of slow highly charged ions with a tapered glass capillary

Abstract

The authors have developed a method to produce a microbeam of slow highly charged ions based on a self-organized charge-up inside a tapered glass capillary. A transmission of 8 keV Ar 8+ beam through the capillary 5 cm long with 800/ 24 m inlet/outlet inner diameters was observed stably for more than 1200 s. The transmitted beam had the same size as the outlet with a beam density enhancement of approximately 10 and a divergence of ±5 mrad. The initial beam was guided through a capillary tilted by as large as ±100 mrad, and it still kept the incident charge.

Ion irradiation in liquid of μm3 region for cell surgery

“…To overcome such technical but serious problems, we have developed a scheme using a tapered glass capillary with a thin window at its outlet. 12,13 This scheme can realize pinpoint energy deposition and three-dimensional selection of the bombarding point by observing the outlet through a microscope with a precision of a micron or better in an arbitrary position of a living cell or in any liquid object. Figure 1͑a͒ shows a drawing of the microbeam preparation setup installed on an X-Y stage, which is aligned by the upstream micrometers with respect to the beam line.…”

“…1͑b͔͒ with inlet and outlet diameters of 0.8 mm and several micrometers, respectively. 12,13 The downstream micrometers are used to align the capillary to the beam axis with a step of 0.5 mrad. The capillary outlet is placed in the focus of an optical microscope, which is installed on a three-dimensional stage.…”

Microbeams of Visible Light by Tapered Glass Capillaries

“…Recently, many studies have been reported on microbeam production of keV-MeV accelerated ions using tapered glass capillaries [1][2][3]. Microbeams by the capillaries have advantages of low cost, easily positioning on the target and preferable sizes of beams.…”

Discharging dynamics of insulator surfaces irradiated by highly charged ions

“…Besides improving our understanding of the processes leading to material modification, it is equally important to be able to guide the highly charged ions at the desired spot. In this context, recent results on guiding and focusing of highly charged ions by taper-glass micro-capillaries [3,4] appear to be a very promising solution. The guiding, which was previously observed in PET nanocapillaries, was explained by the self-organizing process of the inner wall charge up [5].…”