Experimental study of the hard x-ray emissions in a plasma focus of hundreds of Joules

Barbaglia, Mario Oscar; Bruzzone, H.; Acuña, H.; Soto, Leopoldo; Clausse, Alejandro

doi:10.1088/0741-3335/51/4/045001

Cited by 44 publications

(31 citation statements)

References 17 publications

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“…[18][19][20][21][22] A similar dynamics takes place in the radial phase of the Plasma Focus device. [23][24][25][26] In the last years, gas-puff valves have been used to create a suitable density profile of the filling gas in order to minimize the susceptibility to Rayleigh-Taylor instability (RTI) of a large radius Z-pinch. This technique has lead to the most powerful and efficient plasma radiation source presently available in the laboratory.…”

Section: Introductionmentioning

confidence: 99%

Analytic model for the dynamic Z-pinch

2015

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A model is presented for describing the cylindrical implosion of a shock wave driven by an accelerated piston. It is based in the identification of the acceleration of the shocked mass with the acceleration of the piston. The model yields the separate paths of the piston and the shock. In addition, by considering that the shocked region evolves isentropically, the approximate profiles of all the magnitudes in the shocked region are obtained. The application to the dynamic Z-pinch is presented and the results are compared with the well known snowplow and slug models which are also derived as limiting cases of the present model. The snowplow model is seen to yield a trajectory in between those of the shock and the piston. Instead, the neglect of the inertial effects in the slug model is seen to produce a too fast implosion, and the pressure uniformity is shown to lead to an unphysical instantaneous piston stopping when the shock arrives to the axis. V C 2015 AIP Publishing LLC. [http://dx.

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Section: Introductionmentioning

confidence: 99%

Analytic model for the dynamic Z-pinch

2015

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“…13,14 Some limited experimental works have also been carried out in the past without the outer electrodes. [15][16][17] Although experiments and simulations were done on operation of plasma focus device, without cathode rods no comparison has been made in the past, to compare the operation of FMPF with and without cathode rods while keeping all the other parameters constant. The plasma focus dynamics are sub divided into three distinct phases: the breakdown phase (or reverse pinch phase), the axial acceleration phase (or axial rundown phase) and the radial phase (or radial collapse phase).…”

Section: Introductionmentioning

confidence: 99%

Optimization of neon soft X-ray emission from 200 J plasma focus device for application in soft X-ray lithography

Kalaiselvi¹,

Tan²,

Talebitaher³

et al. 2014

Int. J. Mod. Phys. Conf. Ser.

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The Fast Miniature Plasma Focus (FMPF) device is basically made up of coaxial electrodes with centrally placed anode and six cathode rods surrounding them concentrically. They are enclosed in a vacuum chamber, filled with low pressure operating gas. However, in our experiments, these cathode rods were removed to investigate the influence of them on neon soft X-ray (SXR) and hard X-ray (HXR) emission from the device. On removal of cathode rods, the cathode base plate serves as cathode and the plasma sheath is formed between the anode and the base plate of cathode. Neon was used as the operating gas for our experiments and the FMPF device used is of 235 J energy capacities. The experimental results showed that the FMPF device was able to focus better and the SXR emission efficiency was five times higher without cathode rods than with cathode rods. On the contrary, HXR emission did not vary with and without cathode rods. This observed phenomenon was further cross-checked through imaging of plasma dynamics, with and without cathode rods. FMPF device consists of 4 Pseudo Spark Gap (PSG) switches, which need to operate synchronously to deliver high voltage from capacitors to the anode. It was also seen that, the presence or absence of cathode rods also influence the synchronous operation of PSG switches. It also implies that this is one definite way to optimize the SXR emission from the FMPF device. This study reveals an important finding that, cathode rods play a vital role in the formation of plasma sheath with consequential influence on the radiation emission from plasma focus devices. Enhancement of the X-ray emission from this device is definitely a stepping stone in the realization of this device for industrial applications such as X-ray lithography for semiconductor industries.

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“…18 According to plasma temperature and electron density that have been measured for argon plasma in other low energy devices, the electron density in the device under study can be as high as 10 19 cm À3 and the plasma temperature can reach 1 keV. 21 Critical electric filed to generate runway electron for the values of electron density and temperature mentioned is about 40 kV cm À1 for 10 19 cm À3 and 1 keV plasma.…”

mentioning

confidence: 98%

“…Those studies provide valuable information on the plasma inductance and the voltage across the plasma column during the pinch phase. [14][15][16][17][18][19] According to mentioned previous studies in the final stage of plasma focus, the anode voltage can be expressed by 19…”

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confidence: 99%

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Common features of particle beams and x-rays generated in a low energy dense plasma focus device

Behbahani

Xiao

2015

Physics of Plasmas

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Features of energetic charged particle beams and x-ray emission in a low energy (1-2 kJ) plasma focus (DPF) device are described and the possible mechanism are explained based on circuit analyses and energy balance in the DPF system. In particular, the resistance and the voltage across the plasma column are estimated to explain the mechanisms of the generation of particle beams and hard x-ray. The analysis shows that the total inductance of a DPF might have played a role for enhancement of the particle beams and x-ray emissions during the phase of anomalous resistance.

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Experimental study of the hard x-ray emissions in a plasma focus of hundreds of Joules

Cited by 44 publications

References 17 publications

Analytic model for the dynamic Z-pinch

Analytic model for the dynamic Z-pinch

Optimization of neon soft X-ray emission from 200 J plasma focus device for application in soft X-ray lithography

Common features of particle beams and x-rays generated in a low energy dense plasma focus device

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