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Shafiq, Muhammad; Hussain, Shafqat; Sharif, Muhammad; Zakaullah, M.

doi:10.1023/a:1021350725317

Cited by 19 publications

(4 citation statements)

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“…Details of the plasma focus device have been reported elsewhere [23,24]. A 9 µF capacitor bank [25], charged at 20 kV (1.8 kJ), giving peak discharge current of about 175 kA, powered the device. A triggertrontype pressurized spark gap [26] served as a switch.…”

Section: Plasma Focus Facilitymentioning

confidence: 99%

The effect of pre-ionization by a shunt resistor on the reproducibility of plasma focus x-ray emission

Ahmad¹,

Sadiq²,

Shafiq³

et al. 2006

Plasma Sources Sci. Technol.

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The effect of pre-ionization by means of a shunt resistor on the x-ray emission of a low energy (1.8 kJ) plasma focus device powered by a 9 µF capacitor bank, charged at 20 kV and giving a peak discharge current of about 175 kA is investigated. Quantrad Si pin-diodes along with a suitable filter are employed as time-resolved x-ray detectors, whereas a multipinhole camera with absorption filters is used for time-integrated analysis. X-ray flux in 4π -geometry is measured as a function of argon filling pressure with and without pre-ionization. It is found that appropriate selection of the shunt resistor increases shot-to-shot reproducibility of the x-ray emission as well as the stability of the pinch filament and broadens the x-ray pulse width. The x-ray emission is also enhanced by (45 ± 5)% at the optimum pressure.

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Section: Plasma Focus Facilitymentioning

confidence: 99%

The effect of pre-ionization by a shunt resistor on the reproducibility of plasma focus x-ray emission

Ahmad¹,

Sadiq²,

Shafiq³

et al. 2006

Plasma Sources Sci. Technol.

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“…The experiment was carried out on a conventional Mather-type PF system. A 9 µF capacitor bank [22], charged at 20 kV (1.8 kJ), giving a peak discharge current of about 175 kA, powered the device. A triggertron-type pressurized spark-gap [23] is used to transfer the charge from the capacitor bank to the electrodes of the PF device.…”

Section: Experimental Set-up and Diagnosticsmentioning

confidence: 99%

Plasma focus as a possible x-ray source for radiography

Hussain¹,

Shafiq²,

Ahmad³

et al. 2005

Plasma Sources Sci. Technol.

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A study of x-ray emission from a low energy (1.8 kJ) plasma focus (PF) device powered by a 9 µF capacitor bank, charged at 20 kV and giving peak discharge current of about 175 kA by using three different anode shapes with a lead insert at the tip is reported. Quantrad Si PIN-diodes with differential filtering are employed as time-resolved x-ray detectors, whereas a multipinhole camera with suitable absorption filters is used for time-integrated analysis. The x-ray flux in different energy windows is measured as a function of the hydrogen filling pressure for each anode. The maximum values of the energy-integrated x-ray flux are found to be 1.36 ± 0.06 J sr −1 , 2.70 ± 0.11 J sr −1 and 2.17 ± 0.09 J sr −1 for a cylindrical anode with a 75˚cut at the tip, a tapered anode with a 75˚cut at the tip and a tapered anode without any cut, respectively. The maximum x-ray emission in 4π-geometry is estimated to be 17.09 ± 0.75 J, 27.91 ± 1.28 J and 27.25 ± 1.13 J with a cylindrical anode with a 75˚cut at the tip, a tapered anode with a 75˚cut at the tip and a tapered anode without any cut, respectively, and the corresponding wall plug efficiencies for x-ray generation are 0.95%, 1.55% and 1.51%. X-ray emission, presumably due to the electrons' bombardment activity at the anode tip, was dominant, which is confirmed by the pinhole images. To demonstrate the feasibility of the present PF device as a possible x-ray source for good contrast radiography, a set of experimental images is presented.

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“…A lot of samples of them in the range of less than one Joule to some Megajouls have been constructed in different research centers all over the world [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Experimental results of breakdown in "Dena" plasma focus device

Goudarzi¹,

Hoseinian²,

Raeisdana³

2014

J. Phys.: Conf. Ser.

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Abstract. In spite of the intense research activities on Plasma Focus devices, the physics of the initial breakdown and surface discharge phase has not been realized completely. In this paper we have analyzed the surface discharge and initial breakdown phase in Filippov-type Plasma Focus Facility "Dena" (90 kJ, 25 kV) on the base of the current and current derivative measured signals by using Argon, Neon and Krypton as working gases at different discharge voltages and gas pressures, and the effects of working conditions (atomic weight, discharge voltage and gas pressure) on the breakdown and surface discharge phase have expressed. Also, on the base of these results, we have investigated about the relation of this phase with final pinch phase.

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Untitled

Cited by 19 publications

References 0 publications

The effect of pre-ionization by a shunt resistor on the reproducibility of plasma focus x-ray emission

The effect of pre-ionization by a shunt resistor on the reproducibility of plasma focus x-ray emission

Plasma focus as a possible x-ray source for radiography

Experimental results of breakdown in "Dena" plasma focus device

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