Dynamics of an Al wire corona of a megaampere Z-pinch

Kubeš, P.; Kravárik, J.; Renner, O.; Krouský, E.; Bakshaev, Yu. L.; Blinov, P. I.; Chernenko, A. S.; Gordeev, E. M.; Dan’ko, S. A.; Korolev, V. D.; Shashkov, A. Yu.

doi:10.1134/1.1469170

Cited by 5 publications

(5 citation statements)

References 7 publications

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“…Signals of PIN detectors, as well as signals of x-rays, Cherenkov detectors and neutrons were below the sensitivity of the diagnostics. The corona emission in VUV and XUV range was much smaller than those obtained at the experiments with a C fiber and Al wire, which were performed earlier [4]. Observed cooling was interpreted by drop of the temperature of the ions in the imploding current sheath by collisions with deuterons of the fiber corona due to their similar mass.…”

Section: Discussionmentioning

confidence: 69%

“…This research is concentrated on a comprehensive x-ray and neutron diagnostics with the temporal spatial and spectral resolution of the phase of the plasma focus evolution [1,2,3]. The influence of the wire placed in the axis at the top of the inner electrode on the production of x-rays and neutrons was studied in [4]. The presence of the Al wire in the axis of electrode outlet intensified the radiation in the spectral range of Al Land K-shell lines 300 ÷ 1000 eV.…”

Section: Introductionmentioning

confidence: 99%

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Influence of CD2 fiber on the compression in the PF-1000 facility

et al. 2004

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The paper presents the results of observations of the visible radiation, x-rays and neutrons produced during the implosion of the plasma sheath upon the deuterated fiber placed at the z-axis. The discharges were carried out in the PF-1000 facility with current amplitudes ranging 2 MA. The plasma was detected with a PIN silicon detector, two soft x-ray detectors using microchannel plates, four frame cameras operating in the visible spectral range, a visible streak camera, a time-resolved optical spectrometer, three scintillation probes for time-resolved measurements of the hard x-ray and neutron emission in the downstream, upstream and side-on directions. The neutron yield was measured with five silver-activation counters. Experiments were carried out with the implosion of the hydrogen-or deuterium-plasma current-sheath upon the CD2 fiber. Considerable decrees of the soft and hard x-rays was observed in comparison to shots without fiber. The neutron yield was zero during the implosion of the hydrogen-plasma current-sheath and it was considerably decreased (by one order) during the implosion of the deuteriumplasma current-sheath. The temperature of ≈ 5 eV and the electron density of ≈ 10 25 m −3 were evaluated from intensities of the CIII-and CIV-lines. These results were different from those obtained during the experiments with implosion of deuterium-plasma current sheath on the C fiber or Al wire, which were performed earlier. At the similar conditions the decrease of the x-rays and neutrons was not observed.PACS : 52.59.Hg

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Section: Discussionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Influence of CD2 fiber on the compression in the PF-1000 facility

et al. 2004

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“…With the expansion of cathode plasma the period of the instability increase throughout the spectral range and the 2-D structure was observed up to the moment of interelectrode reconnection (350 ÷ 370 ns). It should be noted that such structure was observed in [3] where electrical current up to 2 MA with rise time of 10 ns goes through the aluminum wire of 100 µm in diameter.…”

Section: Resultsmentioning

confidence: 94%

Energy transportation via MITL by the linear current flow density up to 7 MA/cm

et al. 2006

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The transmission properties of the magnetically self-insulated vacuum transporting line (MITL) were studied on the S-300 pulsed power machine (3 MA, 100 ns) at the high linear current flow density up to dI/db = 7 MA/cm. Experiments were carried out with the short line sections with 10 ÷ 15 mm length and 3 ÷ 5 mm vacuum gap. For measuring of the plasma parameters, the frame ICT photography with the nanosecond temporal resolution in the SXR range and ICT (Image Converter Tube) chronography in visible range were used. The X-ray radiation in various ranges was recorded by the XRD with thin filters (SXR) and by the semiconductor detectors (HXR). The information about current transmission efficiency was obtained by means of magnetic loops and lowinductance shunt. It was determined that dense plasma arose on both anode and cathode when the linear current flow density was low enough, dI/db ≤ 1 MA/cm. A dense plasma moves across the vacuum gap with the velocity (1 ÷ 2) × 10 6 cm/s. By recording the current and hard X-ray radiation it was found that electron losses in the current front did not exceed 10 ÷ 100 kA. Under strong magnetization of electrons r H = mvc/eB < d, these losses could be due to the motion of fast plasma component, which velocity exceeds 10 7 cm/s. Such a rare plasma sheath formed on the cathode by dI/db ≥ 1 MA/cm. Thereby the successful physical modeling of the recyclable MITL related to the Sandia Laboratories' Conceptual Project of fusion reactor on the base of fast Z-pinch has been brought about.

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“…On the other hand, the z should be higher at the evolution of instabilities. For example, the spectral lines in the hot-spots at the copper wire experiment in the MA z-pinch show the T e ≈ (200-500) eV, n e ≈ (10 25 -10 24 ) m −3 and z ≈ 17-23 [13]. Similarly at the PF-1000 in the experiments with the implosion of the deuterium plasma sheath on the Al wire, the Al H-like lines were observed [14].…”

Section: The First Neutron Pulsementioning

confidence: 99%

Correlation of x-ray emission with interferometry and neutron diagnostics at tungsten anode face and deuterium filling in plasma-focus discharge

Kubeš

Paduch

Klír

et al. 2013

Plasma Phys. Control. Fusion

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In this paper, the influence of the tungsten evaporated from the anode on neutron production and soft x-ray radiation was studied on the base of x-ray, interferometry and neutron diagnostics performed on the plasma-focus PF-1000 device with deuterium as the filling gas at the current of 2 MA and neutron yield above 10 10 . In the axial center of the anode face the copper circuit plate was substituted with a tungsten one. During the pinch, the tungsten ions evaporated from the anode were transported into the plasma column. The differences in the filters used in the microchannel-plate detector X-frames and PIN detectors enabled separation of the bremsstrahlung emitted by the deuterium plasma from the recombination radiation of the tungsten ions produced in the region of the plasma column near the anode at the time of the evolution of instabilities. In comparison with the copper anode face, the neutron yield decreased to 40% and the energy of deuterons producing neutrons to 80%.

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Dynamics of an Al wire corona of a megaampere Z-pinch

Cited by 5 publications

References 7 publications

Influence of CD2 fiber on the compression in the PF-1000 facility

Influence of CD2 fiber on the compression in the PF-1000 facility

Energy transportation via MITL by the linear current flow density up to 7 MA/cm

Correlation of x-ray emission with interferometry and neutron diagnostics at tungsten anode face and deuterium filling in plasma-focus discharge

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