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P: Plasmaphysik
P 1: Plasma Wall Interaction
P 1.4: Talk
Monday, March 17, 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, ne, and temperature, Te, of the plasma are measured with a double Langmuir probe for different arc plasma conditions and for different arc channel geometries. Te 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, ne 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.