Effect of targets on plasma focus dynamics

Lee, S.; Alabraba, M. A.; Gholap, A. V.; Kumar, Sachin; Kwek, K. H.; Nisar, Mehwish; Rawat, Rajdeep Singh; Singh, J.

doi:10.1109/27.61519

Cited by 26 publications

(5 citation statements)

References 6 publications

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“…The samples are mounted on a substrate holder at an axial distance of 8 cm above the anode tip behind a moveable aluminium shutter. This distance of specimen not only ensures avoiding the perturbation of plasma dynamics and focusing action [26] but also prevents the mere damage of the sample due to high energy density of ion beams. The aluminium shutter covering the sample is used to avoid the effects of ion beams emitted during the few conditioning shots.…”

Section: Methodsmentioning

confidence: 99%

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Carburizing of zirconium using a low energy Mather type plasma focus

Murtaza

Hussain

Rehman

et al. 2011

Surface and Coatings Technology

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Section: Methodsmentioning

confidence: 99%

“…The anode is engraved 10 mm deep at the tip to reduce the copper impurities. Further details of plasma focus system are given elsewhere [12,26,28].…”

Section: Methodsmentioning

confidence: 99%

Carburizing of zirconium using a low energy Mather type plasma focus

Murtaza

Hussain

Rehman

et al. 2011

Surface and Coatings Technology

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“…The arrow labelled as '1' points to the main current sheath whose central part, closer to the anode, participated in the first pinch earlier while the outer part, which is not disintegrated, is still in axial motion down the chamber. In fact, the shadow images shown in figures 11(b) and (d) clearly show the bubble formation on the frontal part of the current sheath marked by arrow '1', which is the evidence of strong focusing action during the first pinch (refer figure 6(c) of [32], figure 6(b) of [33] and last shadow images in figures 7(a), (b) and (c) of this paper). It has been reported that the m = 0 instabilities enhance the induced electric field which accelerates ions towards the top of the chamber which in turn cause an ionization front which soon overtakes the axial shock front (formed due to axial expansion of the current sheath) and develops into a bubble structure [34].…”

Section: Discussion On Shadowgraphic Observationsmentioning

confidence: 62%

The effect of anode shape on neon soft x-ray emissions and current sheath configuration in plasma focus device

Mohammadi¹,

Sobhanian²,

Wong³

et al. 2009

J. Phys. D: Appl. Phys.

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The effect of three different anode shapes, flat, tapered and hemispherical, on the x-ray emission characteristics of a neon filled UNU-ICTP plasma focus device is investigated. The current sheath dynamics, in the radial collapse phase, has been simultaneously interrogated using the laser shadowgraphy method to understand the variation in x-ray emission characteristics for anodes of different shapes used in the experiments. The maximum neon soft x-ray (SXR) yield for the flat anode is about 7.5 ± 0.4 J at 4 mbar, whereas for hemispherical and tapered anodes the neon SXR is almost halved with the optimum pressure shifting to a lower value of 3 mbar. The laser shadowgraphic images confirm that the reduction in the overall neon SXR yield is due to the reduced focused plasma column length for these anodes. The relative HXR yield was the highest for the hemispherical anode followed by the tapered and the flat anodes in that order. The shadowgraphic images and the voltage probe signals confirmed that for the hemispherical anode the multiple-pinch phenomenon was most commonly observed, which could be responsible for multiple HXR bursts for this anode with maximum HXR yields.

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“…The shadowgraphic system used in the present study, shown in figure 2, is similar to that given by Lee et al [26]. This shadowgraphic system uses a home-made nitrogen laser, with the laser gap being operated at the atmospheric pressure of the commercially available N 2 gas.…”

Section: Experimental Setup and Methodologymentioning

confidence: 99%

Neon soft x-ray emission studies from the UNU-ICTP plasma focus operated with longer than optimal anode length

Mohammadi¹,

Verma²,

Sobhanian³

et al. 2007

Plasma Sources Sci. Technol.

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The UNU-ICTP plasma focus with a significantly longer than conventional anode can still be a reasonably good neon soft x-ray (SXR) source. The highest average neon SXR yield of 3.3 J was achieved at 3 mbar. The time difference between the two first peaks of the voltage probe signal at the radial collapse phase was found to be inversely related to the SXR yield, i.e. the smaller the time difference, the higher the yield and vice versa. The estimation of average current sheath speeds using the shadowgraphic method coupled with laser and focus peak timing signals showed that the average axial rundown speed is similar to the one obtained for the optimal anode length but the average radial compression speed is decreased significantly. The range of pressure for a good neon SXR yield, however, has become much narrower, making efficient plasma focus operation a very sensitive function of the filling gas pressure for longer than the optimal anode length.

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Effect of targets on plasma focus dynamics

Cited by 26 publications

References 6 publications

Carburizing of zirconium using a low energy Mather type plasma focus

Carburizing of zirconium using a low energy Mather type plasma focus

The effect of anode shape on neon soft x-ray emissions and current sheath configuration in plasma focus device

Neon soft x-ray emission studies from the UNU-ICTP plasma focus operated with longer than optimal anode length

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