Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ap%26ss..55..203l&link_type=abstract
Astrophysics and Space Science, vol. 55, no. 1, May 1978, p. 203-225. Research supported by the Statens Rad for Atomforskning.
Astronomy and Astrophysics
Astrophysics
33
Collisionless Plasmas, Hydrogen Plasma, Magnetic Field Configurations, Magnetohydrodynamic Flow, Beams (Radiation), Depolarization, Electric Fields, Electron Energy, Plasma Diagnostics, Theta Pinch
Scientific paper
Two unpredicted phenomena were observed during an experiment in which a beam of fully ionized hydrogen plasma from a conical theta-pinch device was injected along a longitudinal magnetic field into a curved magnetic field. First, the beam was deflected in the direction opposite to the bend in the magnetic field and, second, the originally cylindrical beam contracted to a flat slab approximately parallel to the plane of field curvature. An attempt is made to present a qualitative discussion of these phenomena. The expected behavior of a plasma beam entering a curved magnetic field is examined, the experimental apparatus and diagnostics are described, and the plasma flow into the longitudinal field and the curved field is recounted. It is found that a backward flow of energetic electrons occurs on the side of the plasma beam polarized to negative potential and that this electron flow establishes a space charge which propagates the transverse electric field upstream. The mechanism responsible for the reverse deflection is considered, and the plasma flow into the curved magnetic field is analyzed theoretically. Attention is also given to a depolarization circuit, beam contraction, and results of previous theoretical and experimental studies.
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