Speaker
Dr
Valentin Ivanov
(Institute of Computational Technologies SB RAS)
Description
Recently, many publications [1–5] have appeared, in which the mechanism of focusing of ion beams in porous dielectric structures is experimentally investigated. This self-organizing charge-up mechanism is called the capillary guiding effect. It consists in the fact that the ion beam induces a layer of surface charges on the walls of such structures, which forms an analog of the wave guide that reflects the beam from the walls. Thus, the initial ion beam is not only focused inside the channel, but also is able to change the direction of its movement in the direction along the axis of the channels, if these channels are located at an angle to the direction of the initial movement of the beam.
A detailed study of this mechanism is possible only on the basis of a meaningful theoretical model that takes into account the probabilities of elastic reflections and charge exchange of ions when they collide with pore walls, depending on the parameters of the initial beam and the properties of the material of the porous structure. The author’s experience in numerical modeling of charged particle beams in micro channel plates [6] allowed him to develop algorithms and programs for modeling guiding effects of ion beams and to carry out calculations to study the details of the guiding mechanism and compare numerical results with experimental data.
Reference
1. N. Stolterfoht, J.H. Bremer, V. Hoffmann et al., Phys. Rev. Lett. 88, 133201 (2002).
2. N. Stolterfoht, R. Hellhammer, P. Sobocinski et al., Nucl. Instr. Meth. B 235,
460 (2005).
3. D.H. Li, Y.Y. Wang, Y.T. Zhao et al., Nucl. Instr. Meth. B 267, 469 (2009).
4. Z. Juhász, B. Sulik, S. Biri et al., Nucl. Instr. Meth. B 267, 321 (2009).
5. T. Nebiki, D. Sekiba, H. Yonemura et al., Nucl. Instr. Meth. B 266, 1324 (2008).
6. V. Ivanov, Methodology of computer design of microchannel amplifiers. Novosibirsk: “Nauka”, 2019.
Primary author
Dr
Valentin Ivanov
(Institute of Computational Technologies SB RAS)
