We have developed a method to produce micro/nano meter sized beams of keV energy highly charged ions (HCIs) and MeV energy protons/He ions with tapered glass capillary optics for application of ...surface modifications and a biological tool called “cell surgery”, respectively. The transmission through the tapered glass capillaries with inlet diameter of 0.8
mmϕ, outlet diameter from 900
nmϕ to several tens of microns and length of about 50
mm was performed using 8/64
keV Ar
8+ beams. The transmitted beams had a density enhancement of about 10 and were guided through a capillary tilted by as large as ±100
mrad. The charge state of the beams was kept during the transmission. The combination of MeV proton/He ion beams and the capillary with a thin end window at its outlet can realize pinpoint energy deposition and three-dimensional selection of the bombarding point in an arbitrary position of a living cell or in any liquid object. We demonstrated that a real biological cell, HeLa cell with the nucleus labeled by green fluorescent protein (GFP), was irradiated with the microbeam, which was prepared by 4
MeV He
2+ entering a capillary with an end window of 7.3
μm in thickness and outlet diameter of 9.6
μmϕ. The transmitted MeV ion beams had density enhancement up to 1000 according to the capillary outlet sizes, which are applicable to various material analyses employing microbeams.
► Micro/nano meter sized ion beams are provided by tapered glass capillaries. ► Capillary’s inner radius was measured as a function of position along its axis. ► Density enhancement and guiding effect can be expected for keV ion beams. ► Combination of MeV ions and end windows has the possibility to realize cell surgery. ► Density enhancement of muon beams was also obtained by tapered insulator tubes.
We observed a slowly and regularly oscillating transmission current through a gap (0.1mm) of paired soda lime glass plates during an injection of a steady highly charged ion beam. The oscillation ...frequency was almost proportional to the injection current intensities. This phenomenon can be attributed to the charge–discharge iteration cycle with dynamic resistive switching of the glass plate. Our model calculation based on such cyclic resistive switching well reproduces the experimental observation.
SPM observation of nano-dots induced by slow highly charged ions Nakamura, Nobuyuki; Terada, Masashi; Nakai, Yoichi ...
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms,
05/2005, Letnik:
232, Številka:
1
Journal Article
Recenzirano
We have observed nano-dots on a highly oriented pyrolytic graphite (HOPG) surface produced by highly charged ion impacts with a scanning probe microscope. In order to clarify the role of potential ...and kinetic energies in surface modification, we have measured the kinetic energy and incident ion charge dependences of the dot size. The results showed that the potential energy or the incident ion charge has strong influence on the surface modification rather than the kinetic energy.
Ion guiding in curved glass capillaries Kojima, Takao M.; Ikeda, Tokihiro; Kanai, Yasuyuki ...
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms,
07/2015, Letnik:
354
Journal Article
Recenzirano
Straight and curved glass capillaries were tested for the guiding of 8keV Ar8+ ion beams. The straight capillary was about 50mm long and 0.87mm/1.1mm in inner/outer diameter. One of the two curved ...capillaries was similar, but was curved with a 270mm radius. The other was 53mm long, had diameters of 2.34mm/2.99mm, and was curved with a 150mm radius. The corresponding bending angles of the two curved capillaries were 9.6° and 17.5°, respectively. Transmission through the straight capillary disappeared when the tilt angle was larger than 5°. The curved capillaries guided the ion beams into their corresponding bending angles, which were much larger than 5°, with transmission efficiencies of a few tens percent. This demonstrates the possibility of developing a new scheme of simple small beam deflectors and related beam optics.
In this paper, we propose a new power peak shifting system that uses demand forecasting. The study is based on the assumption that a dynamic pricing system has been introduced to an office equipped ...with a data center. In addition, we report on the results of simulations that show our proposed peak shifting scheme improves system utility and strength through increased economic efficiency, even when the initial costs of supplementary power equipment such as photovoltaic systems and storage batteries are factored in.
PDF