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Comparative study of X-ray emission from plasma focus relative to different preionization schemes

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Abstract

A 2.7-kJ Mather-type plasma focus has been investigated for X-ray emission with preionization produced by an α-source, a β-source, and a shunt resistor. Time-resolved and time integrated measurements are carried out using a PIN-diode-based X-ray spectrometer and pinhole camera. The β-source (28Ni63) assisted preionization enhances the X-ray emission up to 25%, while preionization induced by depleted uranium (92U238) increases both Cu-Kα and total X-ray yield of about 100%. The preionization caused by the optimum shunt resistor enhances the Cu-Kα and total X-ray yield of about 53%. It is found that preionization also broadens the working pressure range for the high X-ray yield and improves the shot-to-shot reproducibility of the system. Pinhole images reveal that the X-ray emission from the anode tip is dominant owing to impact of electron bombardment, while the X-ray emission from hot spots is also visible.

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Authors and Affiliations

  1. National Tokamak Fusion Program, Islamabad, Pakistan

    S. Ahmad & A. Qayyum

  2. Department of Physics, Quaid-i-Azam University, Islamabad, Pakistan

    M. Hassan & M. Zakaullah

Authors
  1. S. Ahmad
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  2. A. Qayyum
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  3. M. Hassan
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  4. M. Zakaullah
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Correspondence to S. Ahmad.

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Ahmad, S., Qayyum, A., Hassan, M. et al. Comparative study of X-ray emission from plasma focus relative to different preionization schemes. Plasma Phys. Rep. 43, 749–755 (2017). https://doi.org/10.1134/S1063780X17070017

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  • DOI: https://doi.org/10.1134/S1063780X17070017

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