Speaker
Gennadii Liziakin
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P2.3011.pdf
Electric potential profile created by end electrodes in a magnetized rf
discharge plasma
G. Liziakin, A. Gavrikov, R. Usmanov, R. Timirkhanov, V Smirnov
Joint Institute for High Temperatures of the Russian Academy of Sciences, Moscow, Russian
Federation
The reprocessing of spent nuclear fuel (SNF) is one of the ke y challenges facing the nuclear
industry. Among other technologies the plasma based methods for reprocessing SNF are
actively developed [1]. To separate ions in space, it is necessary to create a configuration of
crossed ExH fields immersed into plasma. In a cylindrical chamber filled with plasma and
placed in a magnetic field parallel to its axis, an electric field of a specified configuration
must be produced. Electrodes placed at the ends of the cylindrical vacuum chamber are used
for this purpose.
The problem of generating a stationary electric field in a magnetized radio-frequency
discharge (rf) plasma is studied experimentally. Helmholtz coils produce magnetic field in a
cylindrical vacuum chamber with diameter of 85.6 cm and length of 220 cm. RF discharge is
generated at a frequency of ∼ 5 MHz. The rf power absorbed by plasma lies in the range
0.5-1.5 kW. Electrodes defining a negative potential are placed at the ends of the chamber.
Two pairs of circular flat electrodes with diameter of 5.5 and 45 cm are investigated. The
working gas is argon. Radial profiles of electron density and temperature are obtained. Radial
profile of the plasma potential is investigated, as well as the dependence of plasma potential
on the voltage applied to the end-electrodes.
[1] V. P. Smirnov, A. A. Samokhin, N. A. Vorona, and A. V Gavrikov, “Study of charged particle motion
in fields of different configurations for developing the concept of plasma separation of spent nuclear
fuel,” Plasma Phys. Reports, vol. 39, no. 6, pp. 456–466, 2013.
