A. Drenik

Nanowire sensor response to reactive gas environment

The response of an originally developed catalytic sensor with a Nb2O5 nanowire array at its outer surface to the varying density of O atoms is experimentally and numerically studied. This technique can be used to measure one order of magnitude lower densities of O atoms and achieve a stable linear response in a significantly broader pressure range compared to conventional catalytic probes with a flat surface. The nanostructured outer surface also acts as a thermal barrier against sensor overheating. This approach is generic and can be used for reactive species detection in other reactive gas environments.

Nitrogen retention mechanisms in tokamaks with beryllium and tungsten plasma-facing surfaces

Global gas balance experiments at ASDEX Upgrade (AUG) and JET have shown that a considerable fraction of nitrogen injected for radiative cooling is not recovered as N-2 upon regeneration of the liq ...

Trajectories of Dust Particles in Low-Pressure Magnetized Plasma

The growth of dust particles in electron cyclotron resonance plasma is highly related to the confinement of species in the magnetic field. Nanoparticles formed in these regions draw curved trajectories observable by naked eyes, related to their velocity, mass, and charge.

Molecular ND Band Spectroscopy in the Divertor Region of Nitrogen Seeded JET Discharges

In this contribution we present OES measurements in the JET tokamak of the deuterated NH (ND) radical and the correlation between results of those experiments and measurement of ammonia production. ...