TITLE

Energy flow through a nonambipolar Langmuir sheath

AUTHOR(S)
Dorf, L. A.; Semenov, V. E.
PUB. DATE
July 2009
SOURCE
Physics of Plasmas;Jul2009, Vol. 16 Issue 7, p073501
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
When electrons travel through the sheath toward a plasma-facing surface, they lose a part of their kinetic energy due to the negative work of the electric field in the sheath. What happens to this energy? Does it need to be accounted for if one needs to calculate an energy flux to a wall? In this note, the above questions are answered for three different cases of the boundary conditions: (a) electrically isolated surface charged to a steady-state value corresponding to a floating potential; (b) an isolated wall not yet charged to the floating potential; and (c) biased electrode conducting a steady-state current. The answers are found to be different in each case, but the general conclusion is that to evaluate surface power deposition due to particle bombardment, electron and ion energy fluxes need to be calculated at the wall, and not in the quasineutral plasma.
ACCESSION #
43493825

 

Related Articles

  • Optical Thomson scattering measurements of cylindrical wire array parameters. Harvey-Thompson, A. J.; Lebedev, S. V.; Patankar, S.; Bland, S. N.; Burdiak, G.; Chittenden, J. P.; Colaitis, A.; De Grouchy, P.; Hall, G. N.; Khoory, E.; Hohenberger, M.; Pickworth, L.; Suzuki-Vidal, F.; Smith, R. A.; Skidmore, J.; Suttle, L.; Swadling, G. F. // Physics of Plasmas;May2012, Vol. 19 Issue 5, p056303 

    A Thomson scattering diagnostic has been used to measure the parameters of cylindrical wire array Z pinch plasmas. The scattering operates in the collective regime (α>1) allowing spatially localised measurements of the ion or electron plasma temperatures and of the plasma bulk velocity. The...

  • Nonlinear stopping power of ions in plasmas. Boine-Frankenheim, O. // Physics of Plasmas;May96, Vol. 3 Issue 5, p1585 

    Studies the nonlinear stopping power of ions in plasma. Relevance to various applications; Numeric solution to the Vlasov-Poisson system; Nonlinear effects that led to reduced Bragg peak of coupling parameters; Characteristics of the nonlinear stopping power.

  • Sheath evolution in a negative ion plasma. Amin, Ali; Aossey, David; Nguyen, Binh Ton; Kim, Hyun-Soo; Cooney, Jamie L.; Lonngren, Karl E. // Physics of Fluids B: Plasma Physics;Oct93, Vol. 5 Issue 10, p3813 

    The spatial and temporal evolution of a sheath surrounding a planar electrode whose potential is suddenly decreased in a quasineutral plasma consisting of positive ions, negative ions, and electrons is numerically investigated. The model predicts several features observed in recent laboratory...

  • Kinetically modified parametric instabilities of circularly polarized Alfvén waves: Ion kinetic effects. Nariyuki, Y.; Hada, T. // Physics of Plasmas;Dec2006, Vol. 13 Issue 12, p124501 

    Parametric instabilities of parallel propagating, circularly polarized, finite amplitude Alfvén waves in a uniform background plasma is studied, within a framework of one-dimensional Vlasov description for ions and massless electron fluid, so that kinetic perturbations in the longitudinal...

  • Sandia's Z machine tops out at over two billion degrees Kelvin.  // Machine Design;5/11/2006, Vol. 78 Issue 9, p44 

    Reports on the hot plasma produced by Sandia's Z machine built to generate radiation fields for validating models of nuclear weapons. Necessity for the determination of the cause of the output to nuclear-fusion plants; Complexities raised by the energy output; Factors that resulted to the...

  • An application of a statistical model for the calculation of the logarithmic mean excitation energy of molecules: Molecular hydrogen. Kamaratos, Efstathios // Journal of Applied Physics;4/1/1985, Vol. 57 Issue 7, p2366 

    Discusses a study which considered a statistical model, the local plasma approximation for the calculation of the logarithmic mean excitation energy for stopping power of chemically bound particles. Application of the statistical model; Chemical compound considered as simple and stable; Use of...

  • Wiebel instability of microwave gas discharge in strong linear and circular pulsed fields. Shokri, B.; Ghorbanalilu, M. // Physics of Plasmas;Jun2004, Vol. 11 Issue 6, p2989 

    Being much weaker than the atomic fields, the gas breakdown produced by high-power pulsed microwave fields is investigated in the nonrelativistic case. The distribution function of the electrons produced by the interaction with intense linearly and circularly polarized microwave fields is...

  • Mechanisms for O- electron stimulated desorption via dissociative attachment in condensed CO. Azria, R.; Parenteau, L.; Sanche, L. // Journal of Chemical Physics;4/15/1988, Vol. 88 Issue 8, p5166 

    The formation of O- ions via dissociative attachment (DA) in electron stimulated desorption from condensed CO is reported. The 2Π states of CO- previously observed in the gas phase and CO- states with the forbidden symmetry Σ- are involved below and above 13 eV, respectively, in the DA...

  • Sheath and presheath in ion-ion plasmas via particle-in-cell simulation. Meige, A.; Leray, G.; Raimbault, J.-L.; Chabert, P. // Applied Physics Letters;2/11/2008, Vol. 92 Issue 6, p061501 

    A full particle-in-cell simulation is developed to investigate electron-free plasmas constituted of positive and negative ions under the influence of a dc bias voltage. It is shown that high-voltage sheaths following the classical Child-law sheaths form within a few microseconds (which...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics