Lee, S. and Saw, S. H. and Jalil, Ali (2017) Compression mechanisms in the plasma focus pinch. AIP Conference Proceedings, 1824 (1).

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Abstract
The compression of the plasma focus pinch is a dynamic process, governed by the electrodynamics of pinch elongation and opposed by the negative rate of change of current dI/dt associated with the current dip. The compressibility of the plasma is influenced by the thermodynamics primarily the specific heat ratio; with greater compressibility as the specific heat ratio γ reduces with increasing degree of freedom f of the plasma ensemble due to ionization energy for the higher Z (atomic number) gases. The most drastic compression occurs when the emitted radiation of a highZ plasma dominates the dynamics leading in extreme cases to radiative collapse which is terminated only when the compressed density is sufficiently high for the inevitable selfabsorption of radiation to occur. We discuss the central pinch equation which contains the basic electrodynamic terms with builtin thermodynamic factors and a dQ/dt term; with Q made up of a Joule heat component and absorptioncorrected radiative terms. Deuterium is considered as a thermodynamic reference (fully ionized perfect gas with f = 3) as well as a zeroradiation reference (bremsstrahlung only; with radiation power negligible compared with electrodynamic power). Higher Z gases are then considered and regimes of thermodynamic enhancement of compression are systematically identified as are regimes of radiationenhancement. The code which incorporates all these effects is used to compute pinch radius ratios in various gases as a measure of compression. Systematic numerical experiments reveal increasing severity in radiationenhancement of compressions as atomic number increases. The work progresses towards a scaling law for radiative collapse and a generalized specific heat ratio incorporating radiation.
Item Type:  Article 

Subjects:  Q Science > QC Physics 
Divisions:  Centre for Plasma Research 
Depositing User:  Unnamed user with email masilah.mansor@newinti.edu.my 
Date Deposited:  17 Apr 2017 01:36 
Last Modified:  17 Apr 2017 01:36 
URI:  http://eprints.intimal.edu.my/id/eprint/762 
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