Role of the Hall flute instability in the interaction of laser and space plasmas with a magnetic field

Zakharov, Yu. P.; Antonov, V. A.; Boyarintsev, E. L.; Мелехов, А. В.; Posukh, V. G.; Шайхисламов, И. Ф.; Pickalov, V. V.

doi:10.1134/s1063780x06030020

Cited by 32 publications

(19 citation statements)

References 30 publications

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“…The growth of flute-like instabilities affecting the plasma dynamics at intermediate levels of magnetization was also demonstrated [25,26]. We should note however that all these studies were conducted in a regime where only the electrons in the plasma were magnetized, the ions being not or weakly magnetized.…”

Section: Historical Contextmentioning

confidence: 99%

Detailed characterization of laser-produced astrophysically-relevant jets formed via a poloidal magnetic nozzle

Higginson

Revet

Khiar

et al. 2017

High Energy Density Physics

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This manuscript is distributed under a Creative Commons Attribution-NonCommercial-NoDerivs License (https://creativecommons.org/licenses/by-nc-nd/4.0/), which permits distribution and reproduction for non-commercial purposes, provided the author and source are cited. General rightsCopyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights. AbstractThe collimation of astrophysically-relevant plasma ejecta in the form of narrow jets via a poloidal magnetic field is studied experimentally by irradiating a target situated in a 20 T axial magnetic field with a 40 J, 0.6 ns, 0.7 mm diameter, high-power laser. The dynamics of the plasma shaping by the magnetic field are studied over 70 ns and up to 20 mm from the source by diagnosing the electron density, temperature and optical self-emission. These show that the initial expansion of the plasma is highly magnetized, which leads to the formation of a cavity structure when the kinetic plasma pressure compresses the magnetic field resulting in an oblique shock [A. Ciardi et al., Phys. Rev. Lett. 110, 025002 (2013)]. The resulting poloidal magnetic nozzle generates a standing conical shock that collimates the plasma into a narrow jet [B. Albertazzi et al., Science 346, 325 (2014).]. At distances far from the target, the jet is only marginally magnetized and maintains a high aspect ratio due to its high Mach-number (M ∼ 20) and not due to external magnetic pressure. The formation of the jet is evaluated over a range of laser intensities (10 12 -10 13 W/cm 2 ), target materials and orientations of the magnetic field. Plasma cavity formation is observed in all cases and the viability of long-range jet formation is found to be dependent on the orientation of the magnetic field.

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Section: Historical Contextmentioning

confidence: 99%

Detailed characterization of laser-produced astrophysically-relevant jets formed via a poloidal magnetic nozzle

Higginson

Revet

Khiar

et al. 2017

High Energy Density Physics

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“…Since the image of the bubble is integrated over z, the visible structures can have no (or small) z dependence and are identified as flutes, similar to those in Refs. [7][8][9].…”

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confidence: 98%

“…Space-borne chemical releases [2,3] to study plasma expansion in situ within Earth's magnetosphere found large-scale structuring and wave activity [6]. Fast photography of expanding plasmas in laboratory experiments [7][8][9] found flute modes which grow rapidly at the plasma surface; the origin of these instabilities has been the focus of intensive theoretical investigation [10,11]. Laboratory work also indicates that an expanding plasma can transfer energy to a background plasma in the form of Alfvén waves [12,13], and that the presence of a surrounding plasma may affect how the expansion evolves [9].…”

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confidence: 99%

Structure of an Exploding Laser-Produced Plasma

Collette

Gekelman

2010

Phys. Rev. Lett.

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We describe the first-ever volumetric, time-resolved measurements performed with a moving probe within an expanding dense plasma, embedded in a background magnetized plasma. High-resolution probe measurements of the magnetic field and floating potential in multiple 2D cut planes combined with a 1 Hz laser system reveal complex three-dimensional current systems within the expanding plasma. Static (ωreal=0) flutelike density striations are observed at the leading edge of the plasma, which are correlated to variations in the current layer at the edge of the expanding plasma.

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“…Such 3D-fields were generated by manyturns coil (∅16 cm) covered by thin-wall metallic ended cylinder of ∅20 cm and supplied by ms-pulsed capacitor scheme for multi-kA current. Figure 2 shows a typical examples of AM-shape in AMEX with apparent non-MHD (λ ≤ R L ), flute-type instability, developing (at left) from the early stage (t = 1.5-2 µs) of LPP deceleration by field (Zakharov et al, 2006(Zakharov et al, , 2008. It could be a reason of plasma penetration inside of MP, up to the dipole's surface at small μ ≤ 10 6 G · cm 3 , since the gap ≈10 cm (between it and MP, here) is comparable with the directed ion Larmor radius R L ≥ 10 cm (at B * d ≈ 300 G).…”

Section: Large Scale Experiments Amex and Relevant 3d/pic-simulationmentioning

confidence: 98%

Laser-plasma simulations of artificial magnetosphere formed by giant coronal mass ejections

Zakharov

Ponomarenko

Vchivkov

et al. 2009

Astrophys Space Sci

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We employed the laboratory (Laser-Produced Plasmas, LPP) and numerical (3D/PIC-code) simulations to study the resulting state of very strong compression of magnetopause (MP) by CME with effective energy E 0 ≥ 10 34 ergs directed to the Earth. During probable formation of an Artificial Magnetosphere (AM, in a flow of CME' plasma around the Earth) with the MP stand-off at R mp up to (2-3)R E , many catastrophic phenomena could occur in a space and ground networks due to very high curl electric fields induced by world-wide magnetic field's changes with a SC-rate >50 nT/s. The laboratory models of AM (with R mp ∼ 0.1-30 cm) were formed around high-field, 1D and 3D magnetic obstacles, overflowing by LPP-blobs with E 0 up to kJ and magnetized ions. The shape and internal structure of a large-scale AM were studied at KI-1 facility of the Russian team using a set of B-dot magnetic probes, while the main goal of UT's small-AM experiment was to explore a possible shock's generation and relevant electron acceleration. Preliminary results of KI-1 experiments show that the both R m -size and SC (E 0 ) of AM could be described by modified Chapman-Ferraro Scaling, while the whole SCdistribution (in front "one-half" of equatorial plane)-by well-known "Image Dipole" model of the Earth's magnetopause field.

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Role of the Hall flute instability in the interaction of laser and space plasmas with a magnetic field

Cited by 32 publications

References 30 publications

Detailed characterization of laser-produced astrophysically-relevant jets formed via a poloidal magnetic nozzle

Detailed characterization of laser-produced astrophysically-relevant jets formed via a poloidal magnetic nozzle

Structure of an Exploding Laser-Produced Plasma

Laser-plasma simulations of artificial magnetosphere formed by giant coronal mass ejections

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