The influence of the Hall term on the development of magnetized laser-produced plasma jets

Hamlin, Nathaniel; Seyler, C. E.; Khiar, B.

doi:10.1063/1.5017202

Cited by 8 publications

(4 citation statements)

References 43 publications

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“…Further, the ion collisionless skin depth is about 0.02 cm which is less than the length scale of the system (L = 0.1 cm). Hence, we have ignored the effect of viscosity, thermal conductivity, and Hall term and employed pure ideal MHD equations to simulate plasma plume evolution [26][27][28] and will show later that, even with the absence of these effects, the experimental observations of cavity formation and its collapse is well reproduced.…”

Section: Simulation Resultsmentioning

confidence: 99%

A 3D magnetohydrodynamic simulation of the propagation of a plasma plume transverse to applied magnetic field

Patel¹,

Behera²,

Singh³

et al. 2021

Plasma Phys. Control. Fusion

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We have carried out a 3D ideal-MHD (magnetohydrodynamic) simulation to study the evolution of a laser-generated plasma plume in a moderate external magnetic field (0.13 T) oriented perpendicular to the flow direction of the plasma plume. The simulation shows that the plasma plume pushes the external magnetic field lines outward in the direction of the expansion. This leads to the compression and bending of the magnetic field lines. The force resulting from the change in shape and the density of the magnetic field lines opposes the expansion of the plume. An elliptic layer of shocked plasma is formed at the plasma/external field interface leaving a cavity in the plume core due to the outward expansion and the inertia of the plume. As the plasma pressure drops due to expansion, the imbalance between the magnetic energy and the internal energy results in the collapse of the cavity. These observations have striking similarities with the observations of the experiments (Behera et al 2017 Phys. Plasmas 24 033511) performed recently to study the plasma plume expansion in the presence of an external transverse magnetic field. This similarity indicates that the physical mechanisms dominantly governing the plasma plume expansion in the moderate magnetic field are aptly described in the ideal MHD regime. The studies thus show that the laser-generated plasma plume can be utilized to carry out interesting experiments on MHD phenomena in a simple laboratory setup.

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Section: Simulation Resultsmentioning

confidence: 99%

A 3D magnetohydrodynamic simulation of the propagation of a plasma plume transverse to applied magnetic field

Patel¹,

Behera²,

Singh³

et al. 2021

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

show abstract

“…We have chosen the simulation parameters such that the experimental findings reported in the reference [14] could be compared with the simulation results. We have ignored the effect of viscosity, thermal conductivity, and Hall term and employed pure ideal MHD equations to simulate plasma plume evolution [17][18][19] and would show later that even with the absence of these effects, the experimental observations of cavity formation and its collapse is well reproduced.…”

Section: Simulation Resultsmentioning

confidence: 99%

A 3D Magnetohydrodynamic simulation for the propagation of plasma plume transverse to applied magnetic field

Patel,

Behera,

Singh

et al. 2021

Preprint

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We have carried out a 3D ideal-MHD (Magnetohydrodynamic) simulation to study the evolution of laser generated plasma plume in a moderate external magnetic field (0.13 T) oriented perpendicular to the flow direction of the plasma plume. The outcomes of the simulation show that the plasma plume pushes the external magnetic field lines as it expands, thereby creating a cavity in plasma density as well as the external magnetic field. Formation of this cavity is supported and sustained by the plasma pressure. As the plasma pressure drops due to expansion, the imbalance between the magnetic energy and the internal energy results in the collapse of the cavity. These observations have striking similarities with the observations of the experiments [Phys. Plasmas 24, 033511 (2017)] performed recently to study the plasma plume expansion in the presence of an external transverse magnetic field. This similarity indicates that the physical mechanisms dominantly governing the plasma plume expansion in the moderate magnetic field are aptly described in the ideal MHD regime. The studies thus show that the laser generated plasma plume can be utilized to carry out interesting experiments on MHD phenomena in a simple laboratory set up.

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“…The δ ∧ coefficient calculated from Epperlein and Haines [56] gives erroneous behaviour at low magnetization; updated polynomial fits are given in [51]. Transport driven by electrical currents has been discussed theoretically in pulsed power plasma experiments [68,69] and in low density plasma jets [70] but to the best of the authors' knowledge has not been measured experimentally. Current-driven transport has not been shown to be significant in dense laser-driven implosions such as those discussed here.…”

Section: Magnetization Phenomena and Associated Metricsmentioning

confidence: 99%

Exploring extreme magnetization phenomena in directly driven imploding cylindrical targets

Walsh

Florido

Bailly-Grandvaux

et al. 2022

Plasma Phys. Control. Fusion

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This paper uses extended-magnetohydrodynamics (MHD) simulations to explore an extreme magnetized plasma regime realisable by cylindrical implosions on the OMEGA laser facility. This regime is characterized by highly compressed magnetic fields (greater than 10kT across the fuel), which contain a significant proportion of the implosion energy and induce large electrical currents in the plasma. Parameters governing the different magnetization processes such as Ohmic dissipation and suppression of instabilities by magnetic tension are presented, allowing for optimization of experiments to study specific phenomena. For instance, a dopant added to the target gas-fill can enhance magnetic flux compression while enabling spectroscopic diagnosis of the imploding core. In particular, the use of Ar K-shell spectroscopy is investigated by performing detailed non-LTE atomic kinetics and radiative transfer calculations on the MHD data. Direct measurement of the core electron density and temperature would be possible, allowing for both the impact of magnetization on the final temperature and thermal pressure to be obtained. By assuming the magnetic field is frozen into the plasma motion, which is shown to be a good approximation for highly magnetized implosions, spectroscopic diagnosis could be used to estimate which magnetization processes are ruling the implosion dynamics; for example, a relation is given for inferring whether thermally-driven or current-driven transport is dominating.

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The influence of the Hall term on the development of magnetized laser-produced plasma jets

Cited by 8 publications

References 43 publications

A 3D magnetohydrodynamic simulation of the propagation of a plasma plume transverse to applied magnetic field

A 3D magnetohydrodynamic simulation of the propagation of a plasma plume transverse to applied magnetic field

A 3D Magnetohydrodynamic simulation for the propagation of plasma plume transverse to applied magnetic field

Exploring extreme magnetization phenomena in directly driven imploding cylindrical targets

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