Measurements and simulations of the ablation stage of wire arrays with different initial wire sizes

Sinars, D.B.; Cuneo, M. E.; Yu, Edmund; Lebedev, S. V.; Cochrane, Kyle; Jones, B.; Macfarlane, J. J.; Mehlhorn, T. A.; Porter, J. L.; Wenger, D. F.

doi:10.1063/1.2184307

Cited by 45 publications

(23 citation statements)

References 36 publications

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“…Tungsten wire arrays are used much more commonly in large scale z-pinch driven experiments and have therefore been investigated in a great deal more detail. 9,[11][12][13][14] The dynamics observed in the experiments presented in this paper proved to be very different from those observed in the aluminium experiments. The formation of collisional structures was not observed; instead the electron density distributions varied smoothly between the ablation streams and inter-wire gap regions.…”

Section: Introductionmentioning

confidence: 84%

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Shock-less interactions of ablation streams in tungsten wire array z-pinches

et al. 2013

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Shock-less dynamics were observed during the ablation phase in tungsten wire array experiments carried out on the 1.4 MA, 240 ns MAGPIE generator at Imperial College London. This behaviour contrasts with the shock structures which were seen to dominate in previous experiments on aluminium arrays [Swadling et al., Phys. Plasmas 20, 022705 (2013)]. In this paper, we present experimental results and make comparisons both with calculations of the expected mean free paths for collisions between the ablation streams and with previously published Thomson scattering measurements of the plasma parameters in these arrays [Harvey-Thompson et al., Phys. Plasmas 19, 056303 (2012)]. V C 2013 AIP Publishing LLC. [http://dx

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Section: Introductionmentioning

confidence: 84%

“…[14][15][16] This paper presents both quantitative and structural data on this behaviour. We present the results of these experiments alongside calculations of the expected collisional mean free paths for these plasmas.…”

Section: Introductionmentioning

confidence: 99%

Shock-less interactions of ablation streams in tungsten wire array z-pinches

et al. 2013

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“…Previous estimates 16,17 of collisional mean free paths for these experiments have indicated that while each ablation streams should be selfcollisional, the approach velocity between counter propagating Tungsten ablation streams has to be large enough that they should interpenetrate without significant collisional interaction. Although interferometric imaging is sensitive only to the free electron density of the plasma, the mass discrepancy between the ions and the electrons means that the ion component of the plasma carries the vast majority of the momentum; over the spatial scales resolvable in our experiment, the free electron distribution is forced by the constraints of quasineutrality (k De $ lm) to reflect the underlying ion density distribution.…”

Section: Interferometric Evidence Of Changes In Collisional Dynamicsmentioning

confidence: 97%

“…Aluminum and tungsten wire arrays were investigated; previous calculations [15][16][17] had indicated that while the ablation streams produced by aluminum arrays should mostly interact collisionally, those produced by tungsten arrays should remain collisionless for a significant portion of the experiment.…”

Section: Interferometric Evidence Of Changes In Collisional Dynamicsmentioning

confidence: 99%

Experimental investigations of ablation stream interaction dynamics in tungsten wire arrays: Interpenetration, magnetic field advection, and ion deflection

et al. 2016

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Experiments have been carried out to investigate the collisional dynamics of ablation streams produced by cylindrical wire array z-pinches. A combination of laser interferometric imaging, Thomson scattering, and Faraday rotation imaging has been used to make a range of measurements of the temporal evolution of various plasma and flow parameters. This paper presents a summary of previously published data, drawing together a range of different measurements in order to give an overview of the key results. The paper focuses mainly on the results of experiments with tungsten wire arrays. Early interferometric imaging measurements are reviewed, then more recent Thomson scattering measurements are discussed; these measurements provided the first direct evidence of ablation stream interpenetration in a wire array experiment. Combining the data from these experiments gives a view of the temporal evolution of the tungsten stream collisional dynamics. In the final part of the paper, we present new experimental measurements made using an imaging Faraday rotation diagnostic. These experiments investigated the structure of magnetic fields near the array axis directly; the presence of a magnetic field has previously been inferred based on Thomson scattering measurements of ion deflection near the array axis. Although the Thomson and Faraday measurements are not in full quantitative agreement, the Faraday data do qualitatively supports the conjecture that the observed deflections are induced by a static toroidal magnetic field, which has been advected to the array axis by the ablation streams. It is likely that detailed modeling will be needed in order to fully understand the dynamics observed in the experiment. Published by AIP Publishing.

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“…11 were diagnosed through x-ray backlighting with the aid of a streak camera. More modern techniques involves the use of a backlight x-ray plus Bragg crystals, 26,27 giving a resolution of about 10-20 m. Another interesting technique is tunable diode laser absorption, which might allow simultaneous measurement of the FIG. 5.…”

Section: B Proposed Experimental Setupmentioning

confidence: 99%

Interaction of supernovae remnants: From the circumstellar medium to the terrestrial laboratory

Velarde¹,

Garcı́a-Senz²,

Bravo³

et al. 2006

J. Phys. IV France

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The evolution of supernova remnants ͑SNRs͒ represents a useful and natural laboratory for gasdynamics studies. In this paper the results of several hydrodynamical simulations of the propagation and early phases of interaction of two SNRs embedded in a homogeneous interstellar environment are shown. In particular, the hydrodynamic evolution and collision of twin SNRs during their self-similar stage has been simulated using a two-dimensional Lagrangian hydrocode. In addition, the results of a detailed simulation that attempts to set the adequate conditions to reproduce the same phenomenon through laser ablation of two plastic plugs at the laboratory scale are presented. These results indicate that both large-scale and small-scale simulations display several common features that can be used to design an experiment aimed to validate the hydrodynamical codes. Of particular interest are the structures found around the juncture of the two colliding shells produced by the interaction of the remnants.

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Measurements and simulations of the ablation stage of wire arrays with different initial wire sizes

Cited by 45 publications

References 36 publications

Shock-less interactions of ablation streams in tungsten wire array z-pinches

Shock-less interactions of ablation streams in tungsten wire array z-pinches

Experimental investigations of ablation stream interaction dynamics in tungsten wire arrays: Interpenetration, magnetic field advection, and ion deflection

Interaction of supernovae remnants: From the circumstellar medium to the terrestrial laboratory

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