Physics – Plasma Physics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.810b&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Physics
Plasma Physics
Scientific paper
Peculiarities of the plasma transport and oscillation phenomena in the Xe-gas discharge of the SPT and TAL Hall effect thruster were subject of many theoretical-numerical and experimental studies [1-4]. Despite this fact, the origin of a so-called anomalous transport is not understood to this date. As a result, in the theoretical and numerical models [5-6] researches assume ad-hoc cross-field diffusion coefficients, which may differ by several times from the classical Bohm result. To study the transport phenomenon we develop a specialized kinetic model. Our model is 2-dimensional in space (for axial and azimuthal directions), but 3-dimensional in velocity. A similar geometry was adopted in references [1,3]. However, we try to push the simulation to the realistic scale (several centimeters), while keeping the minimum spatial resolution on the order of the local Debye length. New transport results will be compared to the results from the 2D3V axisymmetrical model [6], which is a further development of the fully kinetic model for plasma and neutral gas [5]. The PIC [7] code is applied to the realistic SPT thruster geometry. We add new elementary plasma-chemistry reaction and modify boundary conditions to capture self-consistent dynamics of high ionization states of xenon atoms. It is hoped that the numerical results will provide a better understanding of the anomalous transport in a Hall effect thruster due to the collective modes, and shed light on the nature of the experimentally observed high-frequency oscillations. [1] M.Hirakawa and Y.Arakawa, Particle simulation of plasma phenomena in Hall thrusters, IEPC-95-164 technical paper, 1995. [2] V. I. Baranov et al, "New Conceptions of Oscillation Mechanisms in the Accelerator with Closed Drift of Electrons". IEPC-95-44, 24thInternational Electric Propulsion Conference, Moscow, 1995. [3] M.Hirakawa, Electron transport mechanism in a Hall thruster, IEPC-97-021 technical paper, 1997. [4] N.B.Meerzan, W.A.Hargus, M.A.Capelli, Anomalous electron mobility in a coaxial Hall discharge plasmas, Phys. Rev. E, 63, 026410-1, 2001. [5] J.Szabo, Fully kinetic numerical modeling of a plasma thruster, PhD thesis, MIT, 2001. [6] V.Blateau, M.Martinez-Sanchez, O.Batishchev, J.Szabo, PIC Simulation of High Specific Impulse Hall Effect Thruster, IEPC-01-037 paper, 27th International Electric Propulsion Conference, Pasadena CA, 15-19 October, 2001 [7] C.K.Birdsall and A.B.Langdon, Plasma physics via computer simulation, Inst. of Phys. Publ., 1991
Batishchev Oleg
Martinez-Sanchez Manuel
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