Applied Physics Letters · 2007 · 150 citations · 11 references
Natural SciencesPhysicsElectromagneticsElectromagnetismPlasma PhysicsHigh-temperature PlasmasMagnetized PlasmaPlasma SourcesElectron DensityElectron Density DistributionsIon Source DesignIon Source PhysicsMagnetic NozzlesNozzle GeometryPlasma GenerationVacuum Vessel Design
Cross‑field return currents cause power dissipation in the beam just outside the source. A magnetized hydrogen plasma beam was generated with a cascaded arc, expanding in a vacuum vessel under an axial magnetic field of up to 1.6 T, and its high efficiency is achieved by the combined action of the magnetic field and an optimized nozzle geometry. At 4 cm from the nozzle the beam reached a 2 cm diameter, 7.5×10²⁰ m⁻³ electron density, ~2 eV temperatures, 3.5 km s⁻¹ axial velocity, yielding a peak ion flux density of 2.6×10²⁴ H⁺ m⁻² s⁻¹, unprecedented for linear plasma generators.
A magnetized hydrogen plasma beam was generated with a cascaded arc, expanding in a vacuum vessel at an axial magnetic field of up to 1.6T. Its characteristics were measured at a distance of 4cm from the nozzle: up to a 2cm beam diameter, 7.5×1020m−3 electron density, ∼2eV electron and ion temperatures, and 3.5km∕s axial plasma velocity. This gives a 2.6×1024H+m−2s−1 peak ion flux density, which is unprecedented in linear plasma generators. The high efficiency of the source is obtained by the combined action of the magnetic field and an optimized nozzle geometry. This is interpreted as a cross-field return current that leads to power dissipation in the beam just outside the source.
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Key ITER plasma edge and plasma–material interaction issues
G. Federici, P. Andrew, P. Barabaschi et al. · Journal of Nuclear Materials · 2003 · 353 citations
Experimental Evidence of Molecular Activated Recombination in Detached Recombining Plasmas
N. Ohno, N. Ezumi, S. Takamura et al. · Physical Review Letters · 1998 · 148 citations · Full text