Compression mechanisms in the plasma focus pinch
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 speci...
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| Format: | Article |
| Language: | English |
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AIP Publishing
2017
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| Online Access: | http://eprints.intimal.edu.my/762/ http://eprints.intimal.edu.my/762/1/Compression%20mechanisms%20in%20the%20plasma%20focus%20pinch.pdf |
| _version_ | 1848766560299122688 |
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| author | Lee, S. Saw, S. H. Jalil, Ali |
| author_facet | Lee, S. Saw, S. H. Jalil, Ali |
| author_sort | Lee, S. |
| building | INTI Institutional Repository |
| collection | Online Access |
| description | 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 high-Z 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 self-absorption of radiation to occur. We discuss the central pinch equation
which contains the basic electrodynamic terms with built-in thermodynamic factors and a dQ/dt term; with Q made up of
a Joule heat component and absorption-corrected radiative terms. Deuterium is considered as a thermodynamic reference
(fully ionized perfect gas with f = 3) as well as a zero-radiation 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 radiation-enhancement. 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 radiation-enhancement of compressions as atomic number
increases. The work progresses towards a scaling law for radiative collapse and a generalized specific heat ratio
incorporating radiation. |
| first_indexed | 2025-11-14T11:53:05Z |
| format | Article |
| id | intimal-762 |
| institution | INTI International University |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:53:05Z |
| publishDate | 2017 |
| publisher | AIP Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | intimal-7622017-04-17T01:36:16Z http://eprints.intimal.edu.my/762/ Compression mechanisms in the plasma focus pinch Lee, S. Saw, S. H. Jalil, Ali QC Physics 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 high-Z 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 self-absorption of radiation to occur. We discuss the central pinch equation which contains the basic electrodynamic terms with built-in thermodynamic factors and a dQ/dt term; with Q made up of a Joule heat component and absorption-corrected radiative terms. Deuterium is considered as a thermodynamic reference (fully ionized perfect gas with f = 3) as well as a zero-radiation 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 radiation-enhancement. 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 radiation-enhancement of compressions as atomic number increases. The work progresses towards a scaling law for radiative collapse and a generalized specific heat ratio incorporating radiation. AIP Publishing 2017 Article PeerReviewed text en http://eprints.intimal.edu.my/762/1/Compression%20mechanisms%20in%20the%20plasma%20focus%20pinch.pdf Lee, S. and Saw, S. H. and Jalil, Ali (2017) Compression mechanisms in the plasma focus pinch. AIP Conference Proceedings, 1824 (1). 10.1063/1.4978814 |
| spellingShingle | QC Physics Lee, S. Saw, S. H. Jalil, Ali Compression mechanisms in the plasma focus pinch |
| title | Compression mechanisms in the plasma focus pinch |
| title_full | Compression mechanisms in the plasma focus pinch |
| title_fullStr | Compression mechanisms in the plasma focus pinch |
| title_full_unstemmed | Compression mechanisms in the plasma focus pinch |
| title_short | Compression mechanisms in the plasma focus pinch |
| title_sort | compression mechanisms in the plasma focus pinch |
| topic | QC Physics |
| url | http://eprints.intimal.edu.my/762/ http://eprints.intimal.edu.my/762/ http://eprints.intimal.edu.my/762/1/Compression%20mechanisms%20in%20the%20plasma%20focus%20pinch.pdf |