Laser-Generated Ultrashort Multimegagauss Magnetic Pulses in Plasmas

Sandhu, Arvinder; Dharmadhikari, A. K.; Rajeev, P. P.; Kumar, G. Ravindra; Sengupta, Sudip; Das, Amita; Kaw, P. K.

doi:10.1103/physrevlett.89.225002

Cited by 92 publications

(51 citation statements)

References 33 publications

(26 reference statements)

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“…The magnetic field increases from 0 to 63 megagauss in 3.2 ps at the critical surface of the probe (400 nm) and starts decreasing beyond this time. Magnetic field strength is along expected lines (1,2,(15)(16)(17). Fig.…”

Section: Magnetic Field: Temporal and Spatial Profilesmentioning

confidence: 99%

“…A major physical parameter that mirrors this complex physics is the giant magnetic field-as high as hundreds of megagauss-generated in this interaction. In earlier studies (15)(16)(17), we have shown that the temporal evolution of this megagauss magnetic field can provide essential and very useful information on the transport processfor instance, the conductivity of the hot, dense matter and the penetration depth of the hot electrons can be estimated easily.…”

mentioning

confidence: 99%

“…A spectral analysis of these maps indicates that the magnetic fields are turbulent in nature (18). We use pump-probe Cotton-Mouton polariscopy (15)(16)(17)19) to measure the temporal and spatial evolution of the giant magnetic field (the former on picosecond time scale and the latter on micrometer scale). These polarigrams capture the temporal evolution of the filamentation process and a Fourier analysis of the spatial images clearly shows a broad spectrum with a power-law behavior for the magnetic energy.…”

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confidence: 99%

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Direct observation of turbulent magnetic fields in hot, dense laser produced plasmas

Mondal

Narayanan²,

Ding³

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

150

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Turbulence in fluids is a ubiquitous, fascinating, and complex natural phenomenon that is not yet fully understood. Unraveling turbulence in high density, high temperature plasmas is an even bigger challenge because of the importance of electromagnetic forces and the typically violent environments. Fascinating and novel behavior of hot dense matter has so far been only indirectly inferred because of the enormous difficulties of making observations on such matter. Here, we present direct evidence of turbulence in giant magnetic fields created in an overdense, hot plasma by relativistic intensity (10 18 W∕cm 2 ) femtosecond laser pulses. We have obtained magneto-optic polarigrams at femtosecond time intervals, simultaneously with micrometer spatial resolution. The spatial profiles of the magnetic field show randomness and their k spectra exhibit a power law along with certain well defined peaks at scales shorter than skin depth. Detailed two-dimensional particle-in-cell simulations delineate the underlying interaction between forward currents of relativistic energy "hot" electrons created by the laser pulse and "cold" return currents of thermal electrons induced in the target. Our results are not only fundamentally interesting but should also arouse interest on the role of magnetic turbulence induced resistivity in the context of fast ignition of laser fusion, and the possibility of experimentally simulating such structures with respect to the sun and other stellar environments.intense laser matter interaction | high energy density | astrophysical simulations | filamentary structures T he largest terrestrially available magnetic fields are generated when an intense laser pulse (intensity above 10 18 W∕cm 2 ) irradiates a solid target (1-3). The high energy density produced by laser irradiation generates relativistic electron jets, through the process of wave breaking. These relativistic electron jets carry the laser energy deep into the target ionizing and heating the colder portions behind the laser generated plasma and exciting return shielding currents. In the laboratory, such heating is extremely important for fast ignition of highly compressed targets in laser fusion (4, 5), simulation of intra planetary matter existing at ultrahigh pressure (6), ultrafast X-ray pulses (7), as well as proton and ion acceleration up to the MeV-GeV levels (3). It also serves as an excellent tool for modeling astrophysical systems (8-10). The transport of relativistic electrons through hot dense matter is very complex and is barely understood (11,12). Simulations have shown that relativistic electron transport in plasma media is fraught with severe plasma instabilities particularly the Weibel instability (13), which leads to spatial separation of forward and backward currents and eventually to the emergence of turbulent structures (14) and rapid energy dissipation. A major physical parameter that mirrors this complex physics is the giant magnetic field-as high as hundreds of megagauss-generated in this interaction. In earlier st...

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Section: Magnetic Field: Temporal and Spatial Profilesmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Direct observation of turbulent magnetic fields in hot, dense laser produced plasmas

Mondal

Narayanan²,

Ding³

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

150

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“…The study of SGMF and the knowledge of the plasma density in sub-ps pulse duration is important from point of view of energy transport by the laser pulse in the fast ignition regime [5,6]. SGMF in plasmas produced by sub-ps laser pulses has been measured by Cotton Mouton polarimetry in the sub-ps time scales [7,8] using the pump-probe method. However, one does not get information about the plasma density in these measurements done by using only one probe beam.…”

Section: Introductionmentioning

confidence: 99%

Determination of self generated magnetic field and the plasma density using Cotton Mouton polarimetry with two color probes

Joshi

2013

EPJ Web of Conferences

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Abstract. Self generated magnetic fields (SGMF) in laser produced plasmas are conventionally determined by measuring the Faraday rotation angle of a linearly polarized laser probe beam passing through the plasma along with the interferogram for obtaining plasma density. In this paper, we propose a new method to obtain the plasma density and the SGMF distribution from two simultaneous measurements of Cotton Mouton polarimetry of two linearly polarized probe beams of different colors that pass through plasma in a direction normal to the planar target. It is shown that this technique allows us to determine the distribution of SGMF and the plasma density without doing interferometry of laser produced plasmas.

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“…[1][2][3][4][5] Understanding and controlling electromagnetic (EM) turbulence in these environments is critical to the studies in the fusion energy sciences, and for the inertial confinement concept, 6,7 in particular. Additionally, electromagnetic turbulence is a crucial aspect of numerous astrophysical systems such as gamma-ray bursts and supernova shocks.…”

Section: Introductionmentioning

confidence: 99%

Radiation from particles moving in small-scale magnetic fields created in solid-density laser-plasma laboratory experiments

Keenan

Medvedev

2015

Physics of Plasmas

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Plasmas created by high-intensity lasers are often subject to the formation of kineticstreaming instabilities, such as the Weibel instability, which lead to the spontaneous generation of high-amplitude, tangled magnetic fields. These fields typically exist on small spatial scales, i.e. "sub-Larmor scales". Radiation from charged particles moving through small-scale electromagnetic (EM) turbulence has spectral characteristics distinct from both synchrotron and cyclotron radiation, and it carries valuable information on the statistical properties of the EM field structure and evolution. Consequently, this radiation from laserproduced plasmas may offer insight into the underlying electromagnetic turbulence. Here we investigate the prospects for, and demonstrate the feasibility of, such direct radiative diagnostics for mildly relativistic, solid-density laser plasmas produced in lab experiments.

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Laser-Generated Ultrashort Multimegagauss Magnetic Pulses in Plasmas

Cited by 92 publications

References 33 publications

Direct observation of turbulent magnetic fields in hot, dense laser produced plasmas

Direct observation of turbulent magnetic fields in hot, dense laser produced plasmas

Determination of self generated magnetic field and the plasma density using Cotton Mouton polarimetry with two color probes

Radiation from particles moving in small-scale magnetic fields created in solid-density laser-plasma laboratory experiments

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