VINETA II: A linear magnetic reconnection experiment

Bohlin, H.; Stechow, A. von; Grulke, O.; Klinger, T.

doi:10.1063/1.4861359

Cited by 24 publications

(9 citation statements)

References 38 publications

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“…2013; Bohlin et al. 2014), the evolution of the current sheet may be dominated by the tearing mode even for large guide field and thicker current sheets.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Effect of guide field on three-dimensional electron shear flow instabilities in electron current sheets

Jain¹,

Büchner²

2015

J. Plasma Phys.

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We examine the effect of an external guide field and current sheet thickness on the growth rates and nature of three dimensional unstable modes of an electron current sheet driven by electron shear flow. The growth rate of the fastest growing mode drops rapidly with current sheet thickness but increases slowly with the strength of the guide field. The fastest growing mode is tearing type only for thin current sheets (half thickness ≈ d e , where d e = c/ω pe is electron inertial length) and zero guide field.For finite guide field or thicker current sheets, fastest growing mode is non-tearing type. However growth rates of the fastest 2-D tearing mode and 3-D non-tearing mode are comparable for thin current sheets (d e

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“…2013; Bohlin et al. 2014), the evolution of the current sheet may be dominated by the tearing mode even for large guide field and thicker current sheets.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Effect of guide field on three-dimensional electron shear flow instabilities in electron current sheets

Jain¹,

Büchner²

2015

J. Plasma Phys.

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“…Note that guide field reconnection is now investigated in situ by the MMS space mission 1 and by laboratory experiments. 2,3 .…”

Section: Introductionmentioning

confidence: 99%

“…Note that guide field reconnection is now investigated in situ by the MMS space mission 1 and by laboratory experiments. 2,3 . So far, the properties of collisionless guide-field reconnection were analyzed theoretically and by numerical simulations using a number of different simplifying plasma models (see, e.g., Refs.…”

Section: Introductionmentioning

confidence: 99%

Turbulent transport in 2D collisionless guide field reconnection

2017

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Transport in hot and dilute, i.e., collisionless, astrophysical and space plasmas is called "anomalous". This transport is due to the interaction between the particles and the self-generated turbulence by their collective interactions. The anomalous transport has very different and not well known properties compared to the transport due to binary collisions, dominant in colder and denser plasmas. Because of its relevance for astrophysical and space plasmas, we explore the excitation of turbulence in current sheets prone to componentor guide-field reconnection, a process not well understood yet. This configuration is typical for stellar coronae, and it is created in the laboratory for which a 2.5D geometry applies. In our analysis, in addition to the immediate vicinity of the X-line, we also include regions outside and near the separatrices. We analyze the anomalous transport properties by using 2.5D Particle-in-Cell code simulations. We split off the mean slow variation (in contrast to the fast turbulent fluctuations) of the macroscopic observables and determine the main transport terms of the generalized Ohm's law. We verify our findings by comparing with the independently determined slowing-down rate of the macroscopic currents (due to a net momentum transfer from particles to waves) and with the transport terms obtained by the first order correlations of the turbulent fluctuations. We find that the turbulence is most intense in the "low density" separatrix region of guide-field reconnection. It is excited by streaming instabilities, is mainly electrostatic and "patchy" in space, and so is the associated anomalous transport. Parts of the energy exchange between turbulence and particles are reversible and quasi-periodic. The remaining irreversible anomalous resistivity can be parametrized by an effective collision rate ranging from the local ion-cyclotron to the lower-hybrid frequency. The contributions to the parallel and the perpendicular (to the magnetic field) components of the slowly varying DC-electric fields, balanced by the turbulence, are similar. This anomalous electric field is, however, smaller than the contributions of the off-diagonal pressure and electron inertia terms of the Ohm's law. This result can now be verified by in-situ measurements of the turbulence, in and around the magnetic reconnection regions of the Earth's magnetosphere by the multi-spacecraft mission MMS and in laboratory experiments like MRX and VINETA-II. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in P.A. Muñoz, J. Büchner and P. Kilian, Physics of Plasmas 24, 022104 (2017), and may be found at http://dx.

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“…On the other hand unidirectional spreading of reconnection in the direction of electron drift velocity was observed in Magnetic Reconnection Experiments (MRX) without guide field 5 . In VINETA-II device, new experiments with varying strength of guide field are planned to study the spreading of reconnection along the guide field [6][7][8] .…”

Section: Introductionmentioning

confidence: 99%

Spreading of magnetic reconnection by electron scale dispersive waves

Jain,

Buechner

2016

Preprint

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We show that on electron scales a patch of the localized magnetic reconnection spreads bi-directionally in a wave like fashion when an external guide-magnetic field in the direction of the electron current is present. The spreading is caused by the propagation of the flow induced and whistler wave modes away from the localized patch. For small guide fields, the spreading is asymmetric being faster in the direction of the electron flow. On increasing the guide field, the spreading becomes increasingly symmetric due to the dominance of the whistler group speed in determining the speed of the spreading. The wave-like spreading of reconnection causes the alternate formation of X-and O-points in the reconnection planes separated by half the wavelength of the reconnection wave.

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VINETA II: A linear magnetic reconnection experiment

Cited by 24 publications

References 38 publications

Effect of guide field on three-dimensional electron shear flow instabilities in electron current sheets

Effect of guide field on three-dimensional electron shear flow instabilities in electron current sheets

Turbulent transport in 2D collisionless guide field reconnection

Spreading of magnetic reconnection by electron scale dispersive waves

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