Spontaneous Transformation in the Pinched Column of the Plasma Focus

Kubeš, P.; Paduch, M.; Pisarczyk, T.; Scholz, M.; Chodukowski, T.; Klír, D.; Kravárik, J.; Řezáč, K.; Ivanova‐Stanik, I.; Karpinski, L.; Sadowski, M.; Tomaszewski, K.; Zielinska, E.

doi:10.1109/tps.2010.2086497

Cited by 29 publications

(37 citation statements)

References 23 publications

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“…The pinch shown in Fig. 2(b) is similar in pinch profile to those observed by Kubes et al 33 The reader is directed to Haines 9 for a discussion of fast ion generation. A varying pinch voltage at the same current suggests the pinch dynamics change on every shot.…”

Section: Derivation Of Alternative Scaling Modelsupporting

confidence: 77%

An alternative scaling model for neutron production in Z-pinch devices

Bures

Krishnan

2012

Physics of Plasmas

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The DD neutron yield (Y n ) from z-pinches, either dense plasma foci or fast radial pinches, has been fitted for decades to the scaling model Y n $ a(I max ) d , where a is a numerical scaling coefficient, I max the peak current, and 3 < d < 5. The data from 12 000 pulses analyzed from eight different z-pinches presented in this paper show that Y n varies by as much as 615 000% about the best fit value of the conventional scaling model with d ¼ 4. A revised scaling model derived from the reaction rate equation and a circuit model that includes the time derivative of the current dI/dt (normalized to its initial value) reduces the scatter in data from 615 000% to 6100%. For the special case of very high normalized dI/dt, the standard deviation between the revised scaling prediction and the measured neutron yields is reduced to just 630%. Implications of this revised scaling for higher current pinches are discussed. V C 2012 American Institute of Physics. [http://dx.

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Section: Derivation Of Alternative Scaling Modelsupporting

confidence: 77%

An alternative scaling model for neutron production in Z-pinch devices

Bures

Krishnan

2012

Physics of Plasmas

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“…19 Interferometry showed the existence and evolution of toroidal, helical, and spherical structures inside the plasma column without filaments. All these structures probably have a compact form created by the internal closed currents and the associated magnetic field with a balanced poloidal and toroidal component.…”

Section: Introductionmentioning

confidence: 99%

Filamentary structure of plasma produced by compression of puffing deuterium by deuterium or neon plasma sheath on plasma-focus discharge

et al. 2014

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The present experiments were performed on the PF-1000 plasma focus device at a current of 2 MA with the deuterium injected from the gas-puff placed in the axis of the anode face. The XUV frames showed, in contrast with the interferograms, the fine structure: filaments and spots up to 1 mm diameter. In the deuterium filling, the short filaments are registered mainly in the region of the internal plasmoidal structures and their number correlates with the intensity of neutron production. The longer filamentary structure was recorded close to the anode after the constriction decay. The long curve-like filaments with spots were registered in the big bubble formed after the pinch phase in the head of the umbrella shape of the plasma sheath. Filaments can indicate the filamentary structure of the current in the pinch. Together with the filaments, small compact balls a few mm in diameter were registered by both interferometry and XUV frame pictures. They emerge out of the dense column and their life-time can be greater than hundreds of ns. V C 2014 AIP Publishing LLC.

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“…In later papers [13]- [15], the interferometric diagnostics were used for an analysis of the evolution of the plasma density and geometry of the dense column, with the temporal resolution of 10-20 ns and the spatial resolution of about 1 mm. The hard X-rays (HXRs) and neutrons were produced during four different periods: 1) during the formation and decay of a dense spherical structure (plasmoid) at the initial phase of the plasma stagnation; 2) during a decrease in the plasma density in the region between the anode and the plasmoid (in the stagnation phase); 3) during evolution of a constriction (phase of development of instabilities); and 4) during the integration of a "plasma lobule" with the pinch column (the "plasma lobule" means a local 2-D or 3-D deformation which prolapses the surface of the dense plasma column).…”

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confidence: 99%

“…In this region, a fast decrease of plasma density is observed [13], [14]. In [15], the total number (about 10 17 ) of fast deuterons producing observed neutrons in intense pulses was estimated to have total energy of 3-5 kJ. It was suspected that the plasma evolution is connected with a spontaneous transformation of azimuthal and self-generated poloidal components of magnetic fields by reconnections [15].…”

mentioning

confidence: 99%

“…In [15], the total number (about 10 17 ) of fast deuterons producing observed neutrons in intense pulses was estimated to have total energy of 3-5 kJ. It was suspected that the plasma evolution is connected with a spontaneous transformation of azimuthal and self-generated poloidal components of magnetic fields by reconnections [15]. 0093-3813/$31.00 © 2012 IEEE This paper deals with transformation of the energy from the condenser battery into the plasma.…”

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confidence: 99%

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Energy Transformations in Column of Plasma-Focus Discharges With Megaampere Currents

Kubeš

Klír

Kravárik

et al. 2012

IEEE Trans. Plasma Sci.

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Energy transformations are estimated from experimental results obtained on the PF-1000 plasma focus facility operated with a deuterium gas filling and maximum current of 2 MA, which enabled the neutron yield of > 10 11 to be obtained. Use was made of the laser interferometry images and the recorded signals of hard X-rays (HXRs) and neutrons, as well as voltage, current, and current-derivative waveforms. The calculations of the inductance, derivative of inductance, and resistance of the current sheath enabled the evaluation of energy delivered to the plasma. It was estimated that, during the intensive pulses of the HXRs and neutrons, energy of 3-11 kJ is delivered to the plasma column probably through an anomalous resistance at the time closely before and during pulses of HXR and neutron production. A predominant portion of this energy is effectively used for the acceleration of fast deuterons capable of producing fusion neutrons.

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Spontaneous Transformation in the Pinched Column of the Plasma Focus

Cited by 29 publications

References 23 publications

An alternative scaling model for neutron production in Z-pinch devices

An alternative scaling model for neutron production in Z-pinch devices

Filamentary structure of plasma produced by compression of puffing deuterium by deuterium or neon plasma sheath on plasma-focus discharge

Energy Transformations in Column of Plasma-Focus Discharges With Megaampere Currents

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