TY - GEN

T1 - THE INFLUENCE OF AMBIPOLAR FIELD ON EDF FORMATION AND CORRESPONDING INTEGRAL PLASMA CHARACTERISTICS

AU - Krasilnikov, M.

AU - Kudryavtsev, A.

PY - 2015

Y1 - 2015

N2 - The electron density function (EDF) carries important information about plasma such as excitation, ionization process rates and etc. The kinetic equation is thought to be complex for EDF calculation which results in arising the local approximation, where the spatial gradients are omitted. The local approximation applicability condition stays to be unclear. To understand these conditions the calculation of EDF function for the positive column discharge has been proceeded. It is shown that even at high pressures, the EDF differs from its local dependence. This fact is arisen from strong growth of ambipolar field at the discharge periphery which results in that the ambipolar electric field cannot be omitted within the framework of local approximation. Also, the rate coefficients have been calculated and analyzed. It is shown that although the rate coefficients are determined by EDF tail which is local even at low pressures up to 1 Torr, ones cannot be determined from local kinetic equation and full Boltzman

AB - The electron density function (EDF) carries important information about plasma such as excitation, ionization process rates and etc. The kinetic equation is thought to be complex for EDF calculation which results in arising the local approximation, where the spatial gradients are omitted. The local approximation applicability condition stays to be unclear. To understand these conditions the calculation of EDF function for the positive column discharge has been proceeded. It is shown that even at high pressures, the EDF differs from its local dependence. This fact is arisen from strong growth of ambipolar field at the discharge periphery which results in that the ambipolar electric field cannot be omitted within the framework of local approximation. Also, the rate coefficients have been calculated and analyzed. It is shown that although the rate coefficients are determined by EDF tail which is local even at low pressures up to 1 Torr, ones cannot be determined from local kinetic equation and full Boltzman

M3 - Conference contribution

SP - 144

EP - 148

BT - VIII International Conference PLASMA PHYSICS AND PLASMA TECHNOLOGY Minsk, Belarus, September 14 – 18, 2015

ER -