Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ap%26ss.144....3l&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 144, no. 1-2, May 1988, p. 3-13. Research supported by the Naturvetenskapl
Astronomy and Astrophysics
Astrophysics
5
Current Density, Plasma Currents, Plasma Jets, Plasma Layers, Astrophysics, Electric Field Strength, Electrostatic Probes, Magnetic Field Configurations, Plasma Guns, Theta Pinch
Scientific paper
Observations of current disruptions and strong electric fields along the magnetic field in a high-density (2 x 10 to the 19th/cu m), highly-ionized, moving, and expanding plasma column are reported. The electric field is interpreted in terms of propagating, strong electric double layers (3-5 kV). An initial plasma column is formed in an axial magnetic field (0.1 T) by means of a conical theta-pinch plasma gun. When an axial current (max 5 kA, 3-5 kV) is drawn through the column, spontaneous disruptions and double-layer formation occur within a few microseconds. Floating, secondary emitting Langmuir probes are used. They often idicate very high positive potential peaks (1-2 kV above the anode potential during a few microsec) in the plasma on the positive side of the double layer. Short, intense bursts of HF radiation are detected at the disruptions.
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