Research output: Contribution to journal › Article › peer-review
Kinetic Theory of the Wall Sheath for Arbitrary Conditions in a Gas-Discharge Plasma. / Murillo, O.; Mustafaev, A. S.; Sukhomlinov, V. S.
In: Technical Physics, Vol. 64, No. 9, 01.09.2019, p. 1308-1318.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Kinetic Theory of the Wall Sheath for Arbitrary Conditions in a Gas-Discharge Plasma
AU - Murillo, O.
AU - Mustafaev, A. S.
AU - Sukhomlinov, V. S.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - Abstract: The self-consistent problem of the structure of a perturbed wall sheath in a dc gas-discharge plasma near a flat surface under negative potential relative to the plasma has been solved for an arbitrary relation between the Debye radius and the ion mean free path. The solution has been obtained without artificial separation of this layer into the quasi-neutral “presheath” and the wall sheath in which quasi-neutrality is violated substantially. The actual ion distribution function in the unperturbed plasma, the dependence of the charge-exchange cross section on the ion energy, and the nonzero electric field in the unperturbed plasma have been considered. It is shown that when the average electron energy is conserved the structure of the perturbed wall sheath weakly depends on the form of the electron distribution function. It has been established that the mean energy of ions in the unperturbed plasma substantially affects the structure of the quasi-neutral presheath as well as the structure of a part of the wall sheath in which quasi-neutrality is not observed even under the assumption that the mean electron energy is much higher than the mean energy of ions. The calculations of ion flow parameters and the structure of the perturbed wall sheath are in conformity with experimental data obtained by other authors, which could not be adequately interpreted earlier.
AB - Abstract: The self-consistent problem of the structure of a perturbed wall sheath in a dc gas-discharge plasma near a flat surface under negative potential relative to the plasma has been solved for an arbitrary relation between the Debye radius and the ion mean free path. The solution has been obtained without artificial separation of this layer into the quasi-neutral “presheath” and the wall sheath in which quasi-neutrality is violated substantially. The actual ion distribution function in the unperturbed plasma, the dependence of the charge-exchange cross section on the ion energy, and the nonzero electric field in the unperturbed plasma have been considered. It is shown that when the average electron energy is conserved the structure of the perturbed wall sheath weakly depends on the form of the electron distribution function. It has been established that the mean energy of ions in the unperturbed plasma substantially affects the structure of the quasi-neutral presheath as well as the structure of a part of the wall sheath in which quasi-neutrality is not observed even under the assumption that the mean electron energy is much higher than the mean energy of ions. The calculations of ion flow parameters and the structure of the perturbed wall sheath are in conformity with experimental data obtained by other authors, which could not be adequately interpreted earlier.
KW - Bohm criterion
KW - Boltzmann equation
KW - gas-discharge plasma
KW - wall sheath
KW - TRANSITION
KW - BOHM CRITERION
KW - PATCH ACTIVE PLASMA
KW - GLOW
UR - http://www.scopus.com/inward/record.url?scp=85073245120&partnerID=8YFLogxK
U2 - 10.1134/S106378421909010X
DO - 10.1134/S106378421909010X
M3 - Article
AN - SCOPUS:85073245120
VL - 64
SP - 1308
EP - 1318
JO - Technical Physics
JF - Technical Physics
SN - 1063-7842
IS - 9
ER -
ID: 47670864