Results of recent experiments with Pf-1000 facility equipped with new large electrodes

Scholz, M.; Karpinski, L.; Paduch, M.; Tomaszewski, K.; Miklaszewski, R.; Pisarczyk, T.; Sadowski, M.; Szydlowski, A.; Dubrovski, A. V.; Volobujev, I. V.

doi:10.1007/bf03165877

Cited by 2 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Numerous experiments have shown that when the current reaches the magnitude of millions of amperes, it can generate a significant axial magnetic pressure that constrains the plasma to accelerate inward and collide (Klir et al, 2020;Kubes et al, 2020). The axial acceleration and radial compression phases have been relatively accurately described through a two-dimensional MHD model (Scholz et al, 2000). The current intensity on the surface of the Sun is much higher than in the laboratory, reaching 10 13 amperes.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Current Pinch Effect during Solar Flare Eruptions

Li,

Liang,

Zhou

et al. 2024

Preprint

View full text Add to dashboard Cite

Based on the vector magnetograms obtained from the SDO/HMI, we calculate the line-of-sight current density distribution of the active region on 2017 September 6, using the integral form of Ampere's law. Comparing the distribution of the current density and the observed flare, we find that: Firstly, the changing trend of the total current density of the active region was consistent with the change of the X-ray flux of the X9.3 flare. Secondly, the distribution of the double-ribbon flare was co-spatial with a pair of conjugate current ribbons with opposite polarities, which were consistently located on both sides of the Line-of line. Additionally, these current ribbons exhibit significant and continuous changes during the flare eruption: During the early phase of the flare eruption, there was a substantial decrease in the area of the current ribbons, resulting in the emergence of a series of high-density small current islands. During the later phase, not only the area rapidly increases, but the flare kernel evolves into a the flare band with the full release of energy. We have discovered a strong spatial correspondence between the flare kernel and the current islands through positional comparisons. This process is consistent with the physical phenomenon of the current pinch effect. Therefore, we speculate that a current pinch effect may occur during the flare eruption, and the formation of the flare kernel is likely attributed to the current pinch effect.

show abstract

Section: Conclusion and Discussionmentioning

confidence: 99%

Current Pinch Effect during Solar Flare Eruptions

Li,

Liang,

Zhou

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…All discharges in the PF-1000U facility were investigated by means of routine diagnostics, i.e. by recording voltage and current-derivative waveforms, laser-interferometer images (from a multi-frame Mach-Zehnder system which was operated with 1 ns Nd : YLF laser pulses of wavelength λ = 527 nm, and a spatial resolution of about 500 μm), hard x-ray and neutron-induced signals (obtained from standard scintillation probes), as well as fusion-neutron yields (measured with silver-activation counters), etc [17][18][19].…”

Section: Experimental Set-upmentioning

confidence: 99%

“…Detailed studies of micro-structures of a PF pinch column have been performed in a few cases only [10,15,16]. Some attention to this question was paid during the extensive experimental studies, performed with the mega-joule PF-1000 facility at IPPLM in Warsaw, Poland, over several years [17][18][19]. This device, which is so far the largest Mather-type machine in the world, was modernized to become the PF-1000U facility about 2 years ago.…”

Section: Introductionmentioning

confidence: 99%

Soft x-ray studies of plasma-focus pinch structures in PF-1000U experiments

Sadowski

Paduch

Składnik‐Sadowska

et al. 2015

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

This work reports on recent experiments performed at the modernized PF-1000U plasma-focus facility. In contrast to earlier studies the main attention was focussed on measurements of the soft x-ray emission. Detailed time-integrated x-ray measurements, carried out using filtered pinhole cameras with sensitive x-ray films, are presented and analysed. The fine structure of the collapsing current sheath and dense pinch column is investigated. Observations of 'plasma filaments' are discussed and compared with those from the old POSEIDON facility. New results are time-integrated x-ray images of PF-1000U discharges with additional gas puffing, which in many cases show distinct plasma filaments and/or 'hot spots' formed inside the dense pinch column. The formation of such 'hot-spots' is explained by necking and breaking of the plasma filaments. Results of time-resolved x-ray measurements, performed outside the experimental chamber by means of scintillation probes, and inside with PIN-diodes placed behind pinholes and absorption filters, are also presented Time-resolved measurements, carried out using an old XUV framing-camera and a new soft x-ray four-frame camera (SXRFFC), are also presented and discussed. Correlations of the time-integrated x-ray images (of plasma filaments and hot spots) with time-resolved x-ray signals are discussed. The hypothesis that plasma-current filaments appear in almost all PF-type discharges is supported by pictures of radial erosion tracks on the anode front-plate after many discharges.

show abstract

Results of recent experiments with Pf-1000 facility equipped with new large electrodes

Cited by 2 publications

References 4 publications

Current Pinch Effect during Solar Flare Eruptions

Current Pinch Effect during Solar Flare Eruptions

Soft x-ray studies of plasma-focus pinch structures in PF-1000U experiments

Contact Info

Product

Resources

About