FlareLab: early results

Soltwisch, H.; Kempkes, P.; Mackel, F.; Stein, H. J.; Tenfelde, J.; Arnold, Lukas; Dreher, J.; Grauer, Rainer

doi:10.1088/0741-3335/52/12/124030

Cited by 14 publications

(12 citation statements)

References 15 publications

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“…The FlareLab device 10 at Ruhr University Bochum was designed by closely following the technical specifications and operational procedures published by Bellan and coworkers for their coronal loop simulation experiment 3,4,11 at the California Institute of Technology (Caltech). Figure 2 shows a crude sketch of the setup.…”

Section: Methodsmentioning

confidence: 99%

On the relevance of magnetohydrodynamic pumping in solar coronal loop simulation experiments

et al. 2012

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A magnetohydrodynamic pumping mechanism was proposed by Bellan [Bellan, Phys. Plasmas 10, 1999(2003] to explain the formation of highly collimated plasmafilled magnetic flux tubes in certain solar coronal loop simulation experiments. In this paper, measurements on such an experiment are compared to the predictions of Bellan's pumping and collimation model. Significant discrepancies between theoretical implications and experimental observations have prompted more elaborate investigations by making use of pertinent modifications of the experimental device. On the basis of these studies it is concluded that the proposed MHD pumping mechanism does not play a crucial role for the formation and temporal evolution of the arched plasma structures that are generated in the coronal loop simulation experiments under consideration.

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Section: Methodsmentioning

confidence: 99%

On the relevance of magnetohydrodynamic pumping in solar coronal loop simulation experiments

et al. 2012

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“…This is substantially longer than both the Alfvén transit time (t A ∼ 1.0 μs) and the duration of other partial toroidal flux rope experiments, which persist for only a few microseconds. 20,21 A sample flux rope plasma cur- rent waveform I p (t) is shown in Fig. 2a.…”

Section: Methodsmentioning

confidence: 99%

“…Additionally, the flux ropes studied here have a partial toroidal geometry and are therefore highly relevant to structures found in the solar corona. Several experimental groups have previously studied partial toroidal plasmas in the laboratory [20][21][22] , but the stability properties of these plasmas were not quantitatively investigated.…”

mentioning

confidence: 99%

Experimental Verification of the Kruskal-Shafranov Stability Limit in Line-Tied Partial Toroidal Plasmas

Oz¹,

Myers²,

Yamada³

et al. 2011

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The stability properties of partial toroidal flux ropes are studied in detail in the laboratory, motivated by ubiquitous arched magnetic structures found on the solar surface. The flux ropes studied here are magnetized arc discharges formed between two electrodes in the Magnetic Reconnection Experiment (MRX) [Yamada et al., Phys. Plasmas, 4, 1936]. The three dimensional evolution of these flux ropes is monitored by a fast visible light framing camera, while their magnetic structure is measured by a variety of internal magnetic probes. The flux ropes are consistently observed to undergo large-scale oscillations as a result of an external kink instability. Using detailed scans of the plasma current, the guide field strength, and the length of the flux rope, we show that the threshold for kink stability is governed by the Kruskal-Shafranov limit for a flux rope that is held fixed at both ends (i.e., q a = 1).

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“…[1][2][3] Drawing on the high reproducibility and the diagnostic accessibility, diverse problems with astrophysical backgrounds, mostly related to solar prominences, have been investigated. The present experiment "FlareLab"at Bochum university aims towards the simulation of solar coronal loops, 4 but it can also be classified as an arched pinch experiment where the current does not flow linearly (like in a z-pinch) but in the toroidal direction between two in-plane electrodes. Differing from toroidal pinch experiments for fusion research, the current is not induced but driven by high voltage capacitors.…”

Section: Introductionmentioning

confidence: 99%

Evolution of plasma loops in a semi-toroidal pinch experiment

et al. 2015

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The FlareLab experiment is a pulsed-power discharge generating magnetized plasma loops similar to a pinch experiment in a semi-toroidal configuration. After gas breakdown along a circular magnetic guide field, the structure expands in its major radius as the plasma becomes highly conductive and the discharge current rises. Photographs, current and electron density measurements reveal a significant broadening in the lateral direction leading to an increasing departure from radial symmetry of plasma parameters in the cross section. It is shown that the luminosity is related to both high electron density and high current density. Simultaneous measurements of current density and electric field reveal a high parallel resistivity of the plasma leading to fast diffusion across the magnetic field. Indications for anomalous resistivity are found by comparison with the Spitzer formula. As the experiment differs from a z-pinch experiment only by the semi-circular shape of the current path, the observed evolution is unexpected and might be of more fundamental significance. V C 2015 AIP Publishing LLC. [http://dx.

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FlareLab: early results

Cited by 14 publications

References 15 publications

On the relevance of magnetohydrodynamic pumping in solar coronal loop simulation experiments

On the relevance of magnetohydrodynamic pumping in solar coronal loop simulation experiments

Experimental Verification of the Kruskal-Shafranov Stability Limit in Line-Tied Partial Toroidal Plasmas

Evolution of plasma loops in a semi-toroidal pinch experiment

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