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P: Plasmaphysik

P 1: Plasma Wall Interaction

P 1.4: Vortrag

Montag, 17. März 2003, 16:45–17:05, FO1

High Flux of Magnetised Hydrogen Plasma in Magnum-PSI — •victor Veremiyenko¹, G. Kruijtzer¹, R.P. Dahiya², R. Engeln³, B. de Groot¹, Z. Ahmad¹, and W.J. Goedheer¹ — ¹FOM Instituut voor Plasmafysica Rijnhuizen, Nieuwegein, The Netherlands — ²Indian Institute of Technology Delhi, New Delhi, India — ³Technische Universiteit Eindhoven, The Netherlands

Magnum-psi is an experiment set up to produce a high flux (10²³-10²⁴m⁻²s⁻¹) of low-temperature (∼ 1 eV) hydrogen plasma in a high magnetic field in order to study the physical and chemical processes during the plasma-surface interaction at such extreme conditions. A cascaded arc source produces the plasma that expands into a vacuum vessel at 10⁻²-1 mbar in a B field of 0.4-1.6 T, generated by five coils. The electron density, n_e, and temperature, T_e, of the plasma are measured with a double Langmuir probe for different arc plasma conditions and for different arc channel geometries. T_e is 0.1-0.3 eV at B=0 T and around 1 eV at B=0.4 T. In a hydrogen plasma, at 30 cm from the arc, n_e ranges from 10¹⁶m⁻³ at B=0 T to 10¹⁸m⁻³ at B=0.4 T. Molecular processes leading to dissociative recombination appear to be inhibited in a strong B field. The energy balance of the arcs is studied by measuring the heating of the cooling water flowing through the plates and the anode. A three-channel arc built to increase the plasma beam area is now under study.