ELFT HÍRADÓ

[Szeminárium koordinátor <sem-admin AT szfki.hu>]

SZFI SeminarDonkó ZoltánWigner RCP SZFIThree decades in low temperature 
plasma physicsTuesday, 11 October 2022, 10:00, KFKI Campus, Bldg. 1, 2nd 
floor, Conference RoomThe vast majority of the matter in the Universe is in 
ionised (i.e., plasma) state, of which the properties differ significantly 
from those of the neutral gaseous state. The electrical conductivity of this 
type of matter and the light emission caused by excitation processes makes 
them possible to use, e.g., in light sources and lasers. The active species 
created in collision processes between the constituents of plasmas serve as 
the basis of a new area of plasma medicine, where plasma sources are used for 
surface modification of, e.g., dental implants and aid curing cancerous 
tissues. These new applications are less known by society, similarly to the 
high-tech applications of plasma technologies in the microelectronics 
industry that provides us with all the computing and communication equipment 
of our modern age. At the same time, electrical discharges exhibit a wide 
range of physics phenomena of which the understanding represents a challenge 
both in experimental and simulation studies. Electrical gas discharges are 
complex systems in which the different (charged and neutral) components 
typically constitute weakly coupled subsystems that are characterized by 
distinct velocity distribution functions. In the case of electrically charged 
species, the distribution functions differ significantly from the 
Maxwell-Boltzmann type, which is caused by the specific energy gain and loss 
mechanisms taking place in the interactions of the charged species with the 
electric field and with other charged and neutral species. In the case of the 
different species (electrons, ions, as well as electrically charged 
microscopic dust particles), these dynamics take place on the largely 
disparate length and time scales. As a consequence of this, the weakly 
ionized low temperature plasmas of electrical gas discharges are 
non-equilibrium systems from the thermodynamics point of view, and therefore, 
their accurate description requires methods of kinetic theory. The talk will 
review some of the above mentioned physics phenomena studied by means of 
state-of-the-art experimental techniques and computational tools. Minden 
érdeklődőt szívesen látunk! - Everyone is welcome to attend.Attila 
Nagysem-admin AT szfki.hu