Marciniak, L. and Akel, M. and Kulinska, A. and Lee, S. and Scholz, M. and Saw, S. H. (2022) Results of plasma radiative compression investigation in the PF-24 device operated with D-2, Ar and (100%-x)D-2+x%Ar mixtures obtained using the 5-phase Lee model code. Applied Radiation and Isotopes, 182. ISSN 0969-8043, DOI https://doi.org/10.1016/j.apradiso.2022.110118.
Full text not available from this repository.Abstract
The article presents new results for plasma radiative compression in high-current discharges in the z-pinch configuration. The results are based on the 113 discharges performed in the plasma-focus PF-24 device operated with D-2, Ar and (100%-x)D-2+xAr mixtures, with Ar pressure fractions x approximate to 3-60% (mole fractions). The constant initial total pressure is about 2.9 mbar and the constant initial pressure of Ar is 1.2 mbar. Each experimental discharge was simulated individually using the 5-phase Lee model code to carry out the fitting procedure of the total discharge current waveform. The results from these 113 computed discharges fitted to the corresponding 113 experimental discharges show that the increase of the effective atomic number of the gas mixture increases the probability of occurrence of plasma radiative compression phenomenon. Relatively weak radiative compression was found for part of the discharges in 15-60% range of Ar mole fractions and in Ar, while the stronger radiative compression occurred for part of discharges in Ar only. This is because there was too little total x-ray line radiation emission during the equilibrium pinch lifetime related to the very small amount of swept up mass and the low current flow through pinched plasma, represented by the decreasing values of model parameters as the Ar mole fraction increases. The results show that the main pinch parameters influencing the occurrence and strength of radiative compression are: total x-ray line emission yield, effective atomic number, initial pinch radius, initial pinch ion number density and initial pinch ion/electron temperature.
| Item Type: | Article |
|---|---|
| Funders: | Polish National Science Centre (Grant No: 2018/29N/ST2/02804), Mohamad Akel from the Institute of Nuclear Physics (IFJ in Poland), Institute of Plasma Physics and Laser Microfusion (IPPLM in Poland), InternationalCentre for Dense Magnetized Plasma (ICDMP with headquarters in Poland) |
| Uncontrolled Keywords: | Lee model code; Plasma-focus; Plasma dynamics; Plasma radiative compression; Z-pinch |
| Subjects: | Q Science > QC Physics R Medicine > R Medicine (General) |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 25 Oct 2023 03:04 |
| Last Modified: | 25 Oct 2023 03:04 |
| URI: | http://eprints.um.edu.my/id/eprint/41763 |
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