Determining thermodynamic parameters of aluminum X-pinch plasma

Artyomov, A. P.; Fedyunin, A. V.; Chaikovsky, S. A.; Oreshkin, V. I.; Lavrinovich, Ivan; Ratakhin, N. A.

doi:10.1134/s1063785013010057

Cited by 12 publications

(7 citation statements)

References 6 publications

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“…A single-wire explosion, in contrast, randomly generates hot-spots at different locations and times along the entire wire length. These x-pinch "hot spots" are believed to be among the brightest laboratory soft xray (1-10 keV) sources [4]. At the same time, the radiating size of a hot-spot is extremely small (a few μm), and the radiation pulse is extremely fast (ps time scales).…”

Section: X-pinch X-ray Radiation Source and Its Applicationsmentioning

confidence: 99%

“…It can be shown, that if the pinch current exceeds some critical value, the radiation energy loss will dominate the Joule energy deposition, and z-pinch plasma column will undergo radiation collapse. It can also be shown, that such radiation collapse and hot-spot formation occurs under conditions close to Bennett equilibrium [4]. The Bennett equilibrium simply describes the balance of magnetic-and plasma-kinetic pressure, and it can be expressed as:…”

Section: X-pinch X-ray Radiation Source and Its Applicationsmentioning

confidence: 99%

“…Obviously, that such a high current can only be achievable in a large pulse-power generators. In the case of partially ionized plasma, the critical current strongly depends on the linear mass of the wire and can be on the order of several tens of kA [4]. It is important to emphasize, that such a relatively small current can be produced with even a very small pulsed-power generator, and hot-spot can be formed at this case.…”

Section: X-pinch X-ray Radiation Source and Its Applicationsmentioning

confidence: 99%

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Mo x-pinch performance from a new compact and portable 1-kA/ns 2-LTD-Brick driver

Шаповалов

Spielman

2016

2016 IEEE International Conference on Plasma Science (ICOPS)

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Section: X-pinch X-ray Radiation Source and Its Applicationsmentioning

confidence: 99%

Section: X-pinch X-ray Radiation Source and Its Applicationsmentioning

confidence: 99%

Section: X-pinch X-ray Radiation Source and Its Applicationsmentioning

confidence: 99%

See 1 more Smart Citation

Mo x-pinch performance from a new compact and portable 1-kA/ns 2-LTD-Brick driver

Шаповалов

Spielman

2016

2016 IEEE International Conference on Plasma Science (ICOPS)

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“…For X pinches with electrical power supplied from compact pulsed current generators, the efficiency of conversion of the primary storage energy into X rays with a quantum energy of >1 keV may be as high as 3 × 10 -4 [18][19][20]. In this case, the generator size and price can be small and the operating costs and opera tion complexity be low.…”

Section: Introductionmentioning

confidence: 99%

A synchronized X-pinch driver

et al. 2014

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The efficiency of the X ray point projection radiography technique has been demonstrated on a terawatt pulse power generator using a detached compact current generator driving an X pinch load. This technique has been approved in an experiment on the multiwire array implosion performed at the Angara 5 1 generator with a peak power as high as 6 TW. The advantage of this experiment over earlier experiments on terawatt generators is in the use of a separate X pinch driver, which makes it possible to arbitrarily vary the sample probing time. The X pinch driver is connected to the load unit by means of a flexible low inductance transmission line. The flexibility of the transmission line is an additional advantage of this technique, since it allows the accuracy of the X ray radiography system adjustment to be improved and the X pinch to be located near the plasma load. When compared to the laser method for producing a probe radiation source, the pro posed technique features a smaller size, a lower cost of the facility, the absence of high price optical elements, and a higher efficiency of X ray generation. Owing to the small size of the synchronized X pinch driver, it can be transported for use in experiments performed at other research organizations.

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“…In an X pinch, the Bennett equilibrium condition (1) seams to hold up to high degrees of compression. For an aluminum X pinch, the parameters of the hot spot were determined for the time of formation of the soft-x-ray pulse, and it was shown that at this time, condition (1) was fulfilled with good precision [32].…”

mentioning

confidence: 99%

Coulomb explosion of “hot spot”

Oreshkin

Chaikovsky

et al. 2016

Physics of Plasmas

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The study presented in this paper has shown that the generation of hard x rays and highenergy ions, which are detected in pinch implosion experiments, may be associated with the Coulomb explosion of the hot spot that is formed due to the outflow of the material from the pinch cross point. During the process of material outflow, the temperature of the hot spot plasma increases, and conditions arise for the plasma electrons to become continuously accelerated. The runaway of electrons from the hot spot region results in the buildup of positive space charge in this region followed by a Coulomb explosion. The conditions for the hot spot plasma electrons to become continuously accelerated have been revealed and estimates have been obtained for the kinetic energy of the ions generated by the Coulomb explosion.A Z pinch is an electrical discharge in plasma, which is compressed under the action of the magnetic pressure produced by the intrinsic discharge current [1][2][3][4][5][6][7]. Typical of Z pinches is the formation of hot spots due to the development of large-scale MHD instabilities [1,2,8-10].The discharge plasma column is deformed during compression, which is accompanied by the formation of necks smaller in radius than the main column. The magnetic pressure in the neck region increases, resulting, first, in faster compression and, second, in material outflow from the neck region in the axial direction. The final stage of the necking is a hot spot.Apparently, the axial jets were first detected in an experimental study [11] where the process of compression of deuterium pinches was investigated. As these jets were accounted for by an increase in neutron yield, the authors of Ref.[11] proposed a "noncylindrical Z pinch" in which the formation of the hot spot was predetermined by the geometry of the discharge.Subsequently, this configuration was called a plasma focus [12,13]. In subsequent experiments on a deuterium plasma focus at currents of about 1 MA, electron beams, hard x rays, and "epithermal" deuterons with energies up to 8 MeV were detected [14]. Even more energetic deuterons with energies of several tens of megaelectron-volts were detected in experiments with deuterium liners imploded at a current of 2.7 MA [15]. To explain the generation of high-energy ions and hard x rays, the so-called "target" mechanism was proposed [16]. It is assumed that in the final stage of formation of the hot spot, displacement currents occur that generate strong electric fields in which charged particles are accelerated.

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Determining thermodynamic parameters of aluminum X-pinch plasma

Cited by 12 publications

References 6 publications

Mo x-pinch performance from a new compact and portable 1-kA/ns 2-LTD-Brick driver

Mo x-pinch performance from a new compact and portable 1-kA/ns 2-LTD-Brick driver

A synchronized X-pinch driver

Coulomb explosion of “hot spot”

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