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SUMMARY:Effects of parallel motion on test-particle transport
DTSTART;VALUE=DATE-TIME:20191223T163500Z
DTEND;VALUE=DATE-TIME:20191223T164000Z
DTSTAMP;VALUE=DATE-TIME:20240623T110252Z
UID:indico-contribution-163@indico.bitp.kiev.ua
DESCRIPTION:Speakers: O.M. Cherniak (Bogolyubov Institute for Theoretical
Physics of the Natioanal Academy of Sciences of Ukraine\, Kyiv)\nTransport
processes play a significant role in the evolution of non-equilibrium pla
smas. Various instabilities which exist in such plasma can generate intens
e fields that interact with particles and cause the anomalous transport. T
he intensity of the generated fields can be high enough to cause anomalous
transport exceeding the collisional one. The possible explanation of a si
gnificant difference between anomalous and collisional transport character
istics is the particle trapping effect.\n The particle trapping effect is
the crucial feature for a two-dimensional transport across the magnetic fi
eld\, particularly when random electric field has an infinite correlation
time. One of the common methods for a theoretical study of this problem is
based on the Taylor relation combined with a certain statistical approxim
ation of velocity correlation function along the trajectories. In our prev
ious work we proposed and validated closure approximation [1] for an infin
ite correlation time and expanded it to account for finite Larmor radius e
ffects [2] as well as finite correlation time [3]. However\, it is also im
portant to study the effect of the particle motion along the magnetic fiel
d on the particle transport. \n Here we use numerical simulation to study
three-dimensional particle motion in constant magnetic and random electric
fields. A set of parameters\, such as random field correlation time\, fin
ite Larmor radius and initial longitudinal velocity are considered. The ef
fect of these parameters on particle transport are discussed.\n This work
is supported by the Project № 20-04/18-2019 of the National Academy of
Sciences of Ukraine.\n\n[1] V.I. Zasenko\, A.G. Zagorodny\, O.M. Chernyak\
, Ukr. J. Phys. 56\, 1007 (2011).\n[2] O.M. Cherniak\, V.I. Zasenko\, Ukr.
J. Phys. 62\, 495 (2017).\n[3] O.M. Cherniak\, V.I. Zasenko\, J. Phys. Co
nf. Ser. 1197\, 012003 (2019).\n\nhttps://indico.bitp.kiev.ua/event/4/cont
ributions/163/
LOCATION:Bogolyubov Institute for Theoretical Physics of the National Acad
emy of Sciences of Ukraine 322
URL:https://indico.bitp.kiev.ua/event/4/contributions/163/
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