Inefficient Magnetic-Field Amplification in Supersonic Laser-Plasma Turbulence

Bott, A. F. A.; Chen, L.; Boutoux, G.; Caillaud, T.; Duval, Alain; Kœnig, M.; Khiar, B.; Lantuéjoul, I.; Déroff, L. Le; Reville, Brian; Rosch, R.; Ryu, Dongsu; Spindloe, C.; Vauzour, B.; Villette, B.; Schekochihin, A. A.; Lamb, D. Q.; Tzeferacos, Petros; Gregori, G.; Casner, A.

doi:10.1103/physrevlett.127.175002

Cited by 15 publications

(10 citation statements)

References 54 publications

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“…12 (left panel) under the assumption of homogeneous and isotropic stochastic magnetic fields. 40,60 Within the uncertainty of the measurement, the magnetic-energy spectra for both MIFEDS and no-MIFEDS are the same.…”

Section: Diagnosing the Magnetic Fields Of The Plasma: Proton Radiogr...mentioning

confidence: 86%

“…38 This advance was possible thanks to design improvements to the platform: 39 specifically, changes in the material composition of the plasma and a new, optimized grid design. The amplification of magnetic fields (but not yet a dynamo) has also been observed in a supersonic turbulent laser-plasma, 40 an experiment that was based on the first successful realization of boundary-free supersonic turbulence in the laboratory. 41 Most recently, a turbulent laser-plasma with Rm ≈ 3500 and Pm ≈ 10 was successfully produced at the National Ignition Facility, with dynamo-amplified magnetic fields of megagauss strengths being observed.…”

Section: Research Articlementioning

confidence: 99%

“…If the magnetic fields are also spatially heterogeneous, this can lead to significant transverse inhomogeneities in the proton beam, as seen at the detector. Such inhomogeneities can be analyzed quantitatively using a (now well-established 37,38,40,[56][57][58][59] ) technique that directly relates proton-flux inhomogeneities to the magnetic field path-integrated along the trajectory of the beam protons using a field-reconstruction algorithm. 60,61 The technique is formally valid under a set of assumptions that are satisfied in the proton radiography setup, and it has been cross-validated on the Omega Laser Facility using Faraday rotation measurements.…”

Section: Diagnosing the Magnetic Fields Of The Plasma: Proton Radiogr...mentioning

confidence: 99%

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Insensitivity of a turbulent laser-plasma dynamo to initial conditions

Bott

Chen

Tzeferacos

et al. 2022

Matter and Radiation at Extremes

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It has recently been demonstrated experimentally that a turbulent plasma created by the collision of two inhomogeneous, asymmetric, weakly magnetized, laser-produced plasma jets can generate strong stochastic magnetic fields via the small-scale turbulent dynamo mechanism, provided the magnetic Reynolds number of the plasma is sufficiently large. In this paper, we compare such a plasma with one arising from two pre-magnetized plasma jets whose creation is identical save for the addition of a strong external magnetic field imposed by a pulsed magnetic field generator. We investigate the differences between the two turbulent systems using a Thomson-scattering diagnostic, x-ray self-emission imaging, and proton radiography. The Thomson-scattering spectra and x-ray images suggest that the external magnetic field has a limited effect on the plasma dynamics in the experiment. Although the external magnetic field induces collimation of the flows in the colliding plasma jets and although the initial strengths of the magnetic fields arising from the interaction between the colliding jets are significantly larger as a result of the external field, the energies and morphologies of the stochastic magnetic fields post-amplification are indistinguishable. We conclude that, for turbulent laser-plasmas with supercritical magnetic Reynolds numbers, the dynamo-amplified magnetic fields are determined by the turbulent dynamics rather than the seed fields or modest changes in the initial flow dynamics of the plasma, a finding consistent with theoretical expectations and simulations of turbulent dynamos.

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Section: Diagnosing the Magnetic Fields Of The Plasma: Proton Radiogr...mentioning

confidence: 86%

Section: Research Articlementioning

confidence: 99%

Section: Diagnosing the Magnetic Fields Of The Plasma: Proton Radiogr...mentioning

confidence: 99%

See 1 more Smart Citation

Insensitivity of a turbulent laser-plasma dynamo to initial conditions

Bott

Chen

Tzeferacos

et al. 2022

Matter and Radiation at Extremes

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View full text Add to dashboard Cite

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“…By placing a reference mesh in the protons' path, and recording the imprint of the beam after it traverses the region between the coils, it is possible to obtain an 'image' of the deflections caused by the electric and magnetic fields around the coil targets. Although axial probing of the coil targets (that is, sending the protons along the axis of the coils) has been discussed as an accurate method to characterize the generated B-field 52,53 , owing to the large size and inductance of the targets presented here, the B-field signatures that would appear in on-axis radiography are indiscernible with the resolution available at LMJ 54 . For this reason, we propose probing the targets perpendicular to their axes 17,52,55 .…”

Section: Extraction Of Plasma Parameters Throughout the Compression A...mentioning

confidence: 99%

A cylindrical implosion platform for the study of highly magnetized plasmas at LMJ

Pérez-Callejo,

Vlachos,

Walsh

et al. 2022

Preprint

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“…For this study, capillary discharge behavior is examined via fully resolved magneto-hydrodynamics simulations performed using the FLASH code. FLASH 24 is a publicly available 26 , parallel, multi-physics, adaptivemesh-refinement, finite-volume Eulerian hydrodynamics and MHD 27 code, whose high energy density physics capabilities 25 and synthetic diagnostics 28 have been validated through benchmarks and code-to-code comparisons 29,30 , as well as through direct application to laserdriven laboratory experiments [31][32][33][34][35][36][37][38] .…”

Section: Magnetohydrodynamics Modelmentioning

confidence: 99%

Impact of Electron Transport Models on Capillary Discharge Plasmas

Diaw,

Coleman,

Cook

et al. 2022

Preprint

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Magnetohydrodynamics (MHD) can be used to model capillary discharge waveguides in laser-wakefield accelerators. However, the predictive capability of MHD can suffer due to poor microscopic closure models. Here, we study the impact of electron heating and thermal conduction on capillary waveguide performance as part of an effort to understand and quantify uncertainties in modeling and designing next-generation plasma accelerators. To do so, we perform two-dimensional high-resolution MHD simulations using an argon-filled capillary discharge waveguide with three different electron transport coefficients models. The models tested include (i) Davies et al. (ii) Spitzer, and (iii) Epperlein-Haines (EH). We found that the EH model overestimates the electron temperature inside the channel by over 20% while predicting a lower azimuthal magnetic field. Moreover, the Spitzer model, often used in MHD simulations for plasma-based accelerators, predicts a significantly higher electron temperature than the other models suggest.

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Inefficient Magnetic-Field Amplification in Supersonic Laser-Plasma Turbulence

Cited by 15 publications

References 54 publications

Insensitivity of a turbulent laser-plasma dynamo to initial conditions

Insensitivity of a turbulent laser-plasma dynamo to initial conditions

A cylindrical implosion platform for the study of highly magnetized plasmas at LMJ

Impact of Electron Transport Models on Capillary Discharge Plasmas

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