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Title:
One dimensional simulations of radiative collapse
Authors:
Chittenden, J. P.
Affiliation:
Imperial College of Science, Technology and Medicine, Blackett Laboratory, Prince Consort Road, London SW7 2BZ U.K.
Publication:
Dense Z-Pinches. AIP Conference Proceedings, Volume 195, pp. 118-123 (1989). (AIPC Homepage)
Publication Date:
12/1989
Origin:
AIP
PACS Keywords:
Theta pinch
Abstract Copyright:
(c) 1989: American Institute of Physics
DOI:
10.1063/1.38883
Bibliographic Code:
1989AIPC..195..118C

Abstract

Results are presented from simulations of radiative collapse in a hydrogen fibre z-pinch using a 1-D Lagrangian code. Particular attention is paid to the initial conversion of cryogenic fibre to pinch plasma and to the latter stages of radiative collapse. During the initial stages, partial ionization and high density transport considerations are employed in a multi-fluid code, enabling the simulation to be started at time zero.

It is found that during the latter stages of radiative collapse, the radial distributions of the major plasma variables diverge from the assumptions of previous zero-D models. Since the Pease-Braginskii limiting current is dependent on the shape factors associated with these profiles, they strongly affect the rate of collapse. Seemingly, the escalating density shape factor allows collapse to continue indefinitely.

Obviously before the pinch can contract to a black hole (or rather a black line) the plasma model used is liable to have broken down. The bulk of this paper represents an in depth study of the physical processes with are responsible for the termination of the collapse. Amongst the phenomena included are the effect of strong coupling and degeneracy upon the equation of state, degenerate corrections to the bremsstrahlung emission rate and opacity considerations.

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