Stable current sheath dynamics caused by preionization source in a small plasma focus device using He as an operating gas
| Autor: | Safdar Hussain, M. Zafar Ilyas, Muhammad Ikram, Muhammad Shafiq, H. U. Khan, M. Zubair khan Niazai |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Nuclear and High Energy Physics Radiation Dense plasma focus Materials science business.industry Phase (waves) High voltage 02 engineering and technology Plasma 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Optics Amplitude 0103 physical sciences General Materials Science Current (fluid) 0210 nano-technology business Rogowski coil |
| Zdroj: | Radiation Effects and Defects in Solids. 174:273-283 |
| ISSN: | 1029-4953 1042-0150 |
| DOI: | 10.1080/10420150.2018.1563896 |
| Popis: | Pinching of the current sheath in the plasma focus (PF) device is an important phase to transfer the stored energy to the high density short lived plasma for the production of a group of useful radiations. The current sheath formation during the initial breakdown of the gas is a critical process in the PF operation. In this regard, the understanding of the current sheath dynamics is of prime importance. In this paper, we present the effects of alpha particle induced preionizaion by U238 in 3.3 kJ He operated PF device on the dynamics of current sheath, focus amplitude and axial rundown velocity by employing Rogowski coil and High voltage probe as main diagnostic tools. The formation of parabolic axisymmetric sheath is confirmed by Rogowski coil and high voltage probe signals which also reveals the variation in focusing time as well as amplitude during collapse phase by using the preionization source. Time resolved X-ray diagnostics are also carried out using PIN diodes covered with Al and Mg filte... |
| Databáze: | OpenAIRE |
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