Effects of Approximation and Close-Fitting Technique of Corona Model on Neon Soft X-Ray Emission in 3-kJ Plasma Focus
In plasma focus (PF), the thermodynamic parameters such as ion fraction α, effective ionic charge number Zeff , and effective specific heat ratio γ at different temperatures may be calculated by corona model (CM). In the Lee model code, the neon Zeff and γ are stored in subroutines using conven...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2015
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| Subjects: | |
| Online Access: | http://eprints.intimal.edu.my/244/ http://eprints.intimal.edu.my/244/ http://eprints.intimal.edu.my/244/1/Effects%20of%20Approximation%20and%20Close-Fitting%20Technique%20of%20Corona%20Model%20on%20Neon%20Soft%20X-Ray%20Emission%20in%203-kJ%20Plasma%20Focus.pdf |
| Summary: | In plasma focus (PF), the thermodynamic
parameters such as ion fraction α, effective ionic charge
number Zeff , and effective specific heat ratio γ at different
temperatures may be calculated by corona model (CM). In the
Lee model code, the neon Zeff and γ are stored in subroutines
using convenient tables and polynomials derived from the CM
(we call this approach approximated CM). In this paper, the
thermodynamic parameters of the CM are close fitted to the data,
thus replacing the approximate CM data with a more accurate
close-fitting CM (CFCM). The comparisons of the Lee model
code using the approximated CM and CFCM subroutines
are conducted, with the main emphasis on optimum neon
soft X-ray (SXR) emission and their properties. The suitable
focus pinch temperature window of 200–500 eV is applied to
generate the optimum neon SXR yield (Ysxr). The optimum neon
Ysxr is found to be 3.19 and 3.49 J at the optimum pressure
P0 = 3.1 torr with approximated CM and CFCM subroutines,
respectively. A high optimum value of SXR yield is obtained
using CFCM subroutines in the Lee model, which is nearer
to the experimental value compared with the approximated
CM subroutines. The use of CFCM in the Lee model contributes
to better estimation for further numerical experiment studies
and gives confidence that the model is sufficiently realistic in
describing the PF dynamics and SXR emission. |
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