K. A. Vokhmyanina

Investigation of contactless electron transmission through dielectric channels

The effect of the contactless transmission (guiding) of 10 keV electrons through cylindrical dielectric channels and planar channels formed by glass plates is studied. The capture and propagation of an electron beam along the channel axis, usual in these cases, are observed in the experiments with two plates. The deviation of the reflection angle from the specular angle and its dependence on the plate length and beamcurrent value under beam reflection from a single plate are investigated.

Studying the interaction of 10-keV electrons with a dielectric surface

The grazing incidence interaction of a 10-keV electron beam with a planar surface of plexiglass is studied experimentally. Moreover, the electron passage through flat channels formed by such surfaces is investigated. The experiments reveal the presence of a guiding effect of the electron passage as in the case of a glass surface. However, there are some features, such as the existence of an initial elevation angle for the case of negative inclination angles of the plate. The formation of self-consistent charge on the surface of the plexiglass and its drain when the current is turned off occur more slowly than on the glass surface. This fact points to the difference in the surface conductivity of insulators.

Investigation of the guiding effect of 10-keV electrons using planar dielectric surfaces

The effect of guiding a 10-keV electron beam using dielectric plates is studied. It is shown that the electron beam after interaction with the insulator surface is deflected by this surface in different ways depending on a variety of grounding schemes of the front and back sides of plexiglass and aluminum-oxide plates. The dependence of the deflection of the beam from the plexiglass plates at different angle positions on the incident electron-beam current value is studied.

CONCERNING CONTACTLESS ION TRANSMISSION IN DIELECTRIC CHANNELS

The interaction between fast ions and the wall of a dielectric channel charged by randomly deposited ions of the flow was studied. It was shown that gradient forces repulsing ions from the wall caused by charge discreteness only arise when taking into consideration correlations in the relative position of the deposited charges.

Propagation of 10-keV electrons through glass macrocapillaries

The features of 10-keV electron propagation through a cylindrical channel made of borosilicate glass are experimentally studied. Experimental results indicate that a fast electron beam can be controlled using tapered capillaries fabricated from the given material. The charge distribution formed inside the channel provides conditions under which no less than 20% of beam electrons pass through the channel without considerable energy losses even if the inclination angles exceed the geometric angle of transmission.

Propagation of 10-keV electrons through tapered glass macrocapillaries

A series of experiments is carried out to study the passage of electrons with an energy of 10 keV through glass macrocapillaries of tapered shape with an input—output diameter ratio of 1 : 10 and 1 : 5. Experiments are performed for different tilt angles of the capillaries with respect to the incident-beam axis. The results demonstrate a significant increase in the current density of a beam passed through the capillaries.

Modeling of guiding of 10 keV electron beam by planar dielectric surface

Study of 10 keV electron beam reflection from a single planar dielectric surface was made. Guiding effect for some part of the beam was observed within grazing angles of incidence. Ionization, electron emission and drain of the surface charge were considered in the computer model to explain the results.