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Terawatt fiber pinch experiments (1991)

Kies, W. ; Decker, G. ; Mälzig, M. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 70 (1991), S. 7261-7272

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: Pinch formation in fiber pinch experiments has been investigated in the lower terawatt regime. The main results are: (1) there are upper limits of breakdown voltage (∼700 kV) and current rise rate (∼20 kA/ns) beyond which leak discharges develop within the vacuum feed of the pulseline KALIF; (2) there is a lower limit of fiber radius (∼10 μm) below which pinch disruptions take place at a pinch current of (approximately-greater-than)300 kA; (3) the hot (Te≤1 keV) inhomogeneous pinch plasma develops typically 10 ns after local collapses (micropinches) at a pinch current (approximately-greater-than)400 kA and lives for more than 50 ns; (4) neutron emission (yield of CD2 fibers ∼1010) appears mostly isotropic; (5) all fiber pinches show global expansion with velocities reaching from typically 10 μm/ns (initial expansion) to (approximately-greater-than)100 μm/ns; and (6) the power requirements for the fiber ablation process are contradictory to those for the final pinch phase.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.349773

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