Plasma filamentation and upper pressure limit for neutron yield in a DPF device

Milanese, M.; Moroso, R.; Pouzo, J.

doi:10.1109/27.249653

Cited by 14 publications

(13 citation statements)

References 8 publications

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Section: Nature Of the Device Optimization Problemmentioning

confidence: 99%

“…All these aspects are probably reflections of the fact that their work was far ahead of its time: it arrived much before the spread of personal computers and internet. On the other hand, GV model has led to significant insights into limiting factors affecting DPF performance [23,24,25] and also to semi-empirical guidelines for design of DPF devices [26 ].…”

Section: Introductionmentioning

confidence: 99%

“…The empirically observed near-constancy of the drive parameter I a p[1] for well-optimized Mather type DPF devices over 8 decades of stored energy can be cited as an example. Since the energy required to ionize the volume of gas swept by the PCS must be supplied[20,23,24,25] by the electromechanical work represented by 35, there should exist an upper pressure limit for the operation of a Mather type DPF device; this conjecture, supported by experimental data[23], is another example of physics external to the snowplow effect.The optimization problem can be generically stated as follows: given a capacitor bank, how should the snowplow device parameters be chosen to yield the best results? This is essentially a quest for a set of constraints which should ideally be satisfied only by a unique set of device parameter values.…”

mentioning

confidence: 99%

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Re-appraisal and extension of the Gratton-Vargas two-dimensional analytical snowplow model of plasma focus evolution in the context of contemporary research

Auluck

2013

Physics of Plasmas

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Recent resurgence of interest in applications of dense plasma focus and doubts about the conventional view of dense plasma focus as a purely irrotational compressive flow have reopened questions concerning device optimization. In this context, this paper re-appraises and extends the analytical snowplow model of plasma focus sheath evolution developed by F. Gratton and J.M. Vargas (GV) (Energy Storage, Compression and Switching, Ed. V. Nardi, H. Sahlin, and W. H. Bostick, Eds., vol. 2. New York: Plenum, 1983, p. 353) and shows its relevance to contemporary research. The GV model enables construction of a special orthogonal coordinate system in which the plasma flow problem can be simplified and a model of sheath structure can be formulated. The Lawrenceville Plasma Physics (LPP) plasma focus facility, which reports neutron yield better than global scaling law, is shown to be operating closer to an optimum operating point of the GV model as compared with PF-1000.

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Section: Nature Of the Device Optimization Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Re-appraisal and extension of the Gratton-Vargas two-dimensional analytical snowplow model of plasma focus evolution in the context of contemporary research

Auluck

2013

Physics of Plasmas

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“…This fact allows the verification that is necessary to get a complete ionization of the swept gas in order to obtain an efficient pinch. When the plasma focus is working beyond the UPL, the CS becomes filamented [12]. Drastic descent of the neutron yield under the detection level is verified in every discharge beyond the UPL.…”

Section: Introductionmentioning

confidence: 99%

Filaments in the Sheath Evolution of the Dense Plasma Focus as Applied to Intense Auroral Observations

Milanese

Niedbalski

Moroso

2007

IEEE Trans. Plasma Sci.

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This paper investigates the dense plasma focus (DPF) for applications in space-plasma physics. The plasma focus (a variant of Z-pinch) generates plasmas from fast high-voltage electrical discharges on coaxial electrodes suitable for very different studies: from fusion up to plasma-space modeling. In particular, the plasma sheath of the DPF is studied here and measured in some detail as a possible model for auroral observations. Deuterium gas was used in the experiments, and many helpful techniques were used, such as ultrafast photograph and neutron detection from nuclear-fusion reactions. In this paper, we show the different phases of the plasma focus correlated with discharge-current characteristics and neutron and X-ray production. Filamentary formations in the current sheath are shown, and its correlation with neutron production is done. The same number of filaments (about 60) reported in auroral observations are detected in plasma-focus discharges.

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“…Accordingly, this validates the idea that it is necessary to get a complete ionization of the swept gas in order to obtain an efficient pinch. When the plasma focus is working beyond the UPL, the sheath becomes filamented [11]. The 4 He specific ionization energy lies in the range 0.6 -1.9 MJ/g depending on how high is the fraction of complete ionizations over single ionizations.…”

Section: Pressure Optimizationmentioning

confidence: 99%

Preliminary tests and performance estimate of PFMA-1, the first prototype of a plasma focus device for SLR production

Sumini

Mostacci

Rocchi

et al. 2007

2007 IEEE Nuclear Science Symposium Conference Record

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PFMA-1 (Plasma Focus for Medical Applications -1) is the first prototype of a new application of the Plasma Focus technology conceived to produce Short Lived Radioisotopes (SLR) for medical PET-TAC imaging applications. The device is a 30 kV, 150 kJ, 40 nH Mather-type plasma focus designed for repetition frequencies up to 1 Hz and dedicated to the neutronfree endogenous production of 18 F by 3 He -16 O reactions. This paper describes some preliminary tests related to the pressure optimization of the gases used in PFMA-1, and presents some final considerations about performance improvements.

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Plasma filamentation and upper pressure limit for neutron yield in a DPF device

Cited by 14 publications

References 8 publications

Re-appraisal and extension of the Gratton-Vargas two-dimensional analytical snowplow model of plasma focus evolution in the context of contemporary research

Re-appraisal and extension of the Gratton-Vargas two-dimensional analytical snowplow model of plasma focus evolution in the context of contemporary research

Filaments in the Sheath Evolution of the Dense Plasma Focus as Applied to Intense Auroral Observations

Preliminary tests and performance estimate of PFMA-1, the first prototype of a plasma focus device for SLR production

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