Bilateral Research Project:

Serbia – Hungary, 2013 – 2015

(Serbian Academy of Sciences and Arts & Hungarian Academy of Sciences)

PROJECT TITLE: " Interactions of charge particles with single insulating capillaries "

PRINCIPAL INVESTIGATOR – Hungary:

Prof. Károly Tőkési,

Institute of Nuclear Research of the Hungarian Academy of Sciences, Hungary, tokesi@atomki.mta.hu

PARTICIPANTS: Dr Réka Judit Bereczky, Gyula Nagy.

PRINCIPAL INVESTIGATOR – Republic of Serbia:

Dr. Aleksandar Milosavljević,

Institute of Physics Belgrade (IPB), University of Belgrade, Serbia, vraz@phy.bg.ac.yu

PARTICIPANTS: Dr. Bratislav Marinković, Dr. Duško Borka (Institute Vinča), Jelena Maljković

Project description

The main goal of the project is to study the transmission of charge particles through single cylindrical-shaped insulating capillaries of microscopic dimension with a large aspect ratio. A unique feature of our investigations is the use of the combination of light projectiles (electrons) with single capillaries. In this combination all the collective effects due to the neighboring capillaries can be neglected and the interaction between the electrons and capillaries can be clearly tested. For these studies the single capillaries from a few tens of micrometers to macroscopic sizes will be produced at the Institute of Nuclear Research of the Hungarian Academy of Sciences from Pyrex material by applying high precision glass technique. The entrance end of the capillary will be covered by graphite in order to avoid charging-up effects. We also plan alternative and new techniques for the capillary production from other insulator material, like Teflon or Vespel, which are known to have surface and bulk resistivities that are orders of magnitude larger than those of Pyrex.

In our experiments we plan to use charged particles both electrons and single charged ions as primary excitation source. Within our collaboration we will perform high energy resolution measurements to investigate the energy distributions of electrons escaping the capillary, as well as angular distributions of electrons transmitted at the incident energy for different tilt angles of the capillary in reference to the incident electron beam direction. We also plan to investigate the time dependence of the electron transmission through the different capillary samples. The experiments with electrons will be realized at the Institute of Physics, University of Belgrade. Furthermore, we plan to perform complemenatry measurementes with ions as projectiles, which will be realized at the Institute of Nuclear Research of the Hungarian Academy of Sciences using the available experimental setup, like ESA-31 spectrometer, proton micro-beam, SIMS (Secondary Ion Mass Spectroscopy) or SNMS (Secondary Neutral Mass Spectroscopy). Finally, in our investigations we will combine our experimental findings with theoretical works.