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38th EPS Conference on Plasma Physics (2011) I1.302 Plasma transport across magnetic field lines in low-temperature plasma sources G. J. M. Hagelaar1 LAPLACE, Université Paul Sabatier, Toulouse, France 1 Magnetized plasma transport plays a key role not only in hot fusion plasmas but also in lowtemperature plasma sources operating at low pressure, in which magnetic fields are used to limit charged particle losses to the walls, reduce the electric plasma conductivity, and/or obtain special kinds of energy coupling. [1, 2] Typical parameters for these plasma sources are: plasma density 1016 - 1018 m-3, neutral gas density 1019-1020 m-3, electron temperature 120 eV, magnetic field strength 0.01 - 0.10 T, which are quite different from those of fusion plasmas. Widely used in applications like materials processing [2], space propulsion, and neutral beam injection [3], these plasma sources are generally developed by a combination of experimental research and numerical modeling. However, as we discuss in this presentation, the understanding of the effect of the magnetic field on low-temperature plasmas is far from complete, and the standard modeling methods used in this field are rather limited as to the description of magnetized plasma transport. This problem has become particularly urgent in recent efforts to model the negative ion source of the neutral beam heating system for ITER, in which a magnetic filter is used to lower the electron temperature and facilitate the negative ion extraction. [3-5] This presentation gives an overview of the state-of-the-art and the open questions in magnetized low-temperature plasma modeling, illustrated with preliminary results on the magnetic filter of the ITER negative ion source. References [1] [2] [3] [4] [5] V. A. Rozhansky and L. D. Tsendin, “Transport phenomena in partially ionized plasma” (Taylor & Francis, London, 2001). M. Lieberman and A. Lichtenberg, “Principles of plasma discharges and materials processing, second edition” (John Wiley & Sons Inc. USA, 2005). R. S. Hemsworth and T. Inoue, IEEE Trans. Plasma Sci. 33 (6), 1799-1813 (2005). E. Speth et al., Nucl. Fusion 46, S220-S238 (2006). J. P. Boeuf, G. J. M. Hagelaar, P. Sarrailh, G. Fubiani, N. Kohen, Plasma Sources Sci. Technol. 20, 015002 (2011).