Studies of Spontaneous Magnetic Fields in Laser-Produced Plasmas by Faraday Rotation

Stamper, J. A.; McLean, E. A.; Ripin, B. H.

doi:10.1103/physrevlett.40.1177

Cited by 169 publications

(54 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Magnetic fields of several megagauss were observed by means of a Faraday rotation of a side-on second-harmonic (0.53-micron) probing laser and also of the specularly reflected main laser beam. Later measurements (Stamper, McLean & Ripin 1978;Raven, Willi & Rumsby 1978) used a Raman-shifted (0.633-micron) probing beam to avoid the difficulties of emitted second-harmonic light. Stamper, McLean & Ripin (1978) used a three-channel recording system and made measurements under a variety of experimental conditions (timing, target material and geometry, laser irradiance, polarization, and prepulse).…”

Section: Optical Measurementsmentioning

confidence: 99%

“…Later measurements (Stamper, McLean & Ripin 1978;Raven, Willi & Rumsby 1978) used a Raman-shifted (0.633-micron) probing beam to avoid the difficulties of emitted second-harmonic light. Stamper, McLean & Ripin (1978) used a three-channel recording system and made measurements under a variety of experimental conditions (timing, target material and geometry, laser irradiance, polarization, and prepulse). All of the data were consistent with thermally generated magnetic fields in the standard (VT x Vn) direction.…”

Section: Optical Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Review on spontaneous magnetic fields in laser-produced plasmas: Phenomena and measurements

Stamper

1991

Laser Part. Beams

Self Cite

180

View full text Add to dashboard Cite

Large (megagauss) "spontaneous" magnetic fields are produced by laser-plasma interactions when a short, powerful laser pulse is focused to a small diameter onto a solid target. The relevance of these magnetic fields to inertial confinement fusion applications depends on the numerous ways in which they can affect laser-plasma interactions and the resulting plasma. Theoretical studies have dealt with a variety (thermal, radiative, and dynamo) of generation mechanisms and with the associated transport and instability phenomena. The fields, originally observed with small induction probes placed near the target, have been studied in the focal region by optical methods. These optical diagnostics have used Faraday rotation of a probing laser beam and Zeeman profiles of emitted spectral lines.

show abstract

Section: Optical Measurementsmentioning

confidence: 99%

Section: Optical Measurementsmentioning

confidence: 99%

Review on spontaneous magnetic fields in laser-produced plasmas: Phenomena and measurements

Stamper

1991

Laser Part. Beams

Self Cite

180

View full text Add to dashboard Cite

show abstract

“…Not surprisingly, the peak magnetic field was observed off-axis since it has to pass through zero on the axis. The field peaked at $2 MG. Further measurements were reported by Stamper et al, 568 for slab and spherical targets with and without prepulses, and Raven et al, 569 who measured no magnetic fields for spheres below 100-lm diam. Perhaps, on this scale, thermal conduction was sufficient to smooth out the temperature gradients.…”

Section: F Self-generated Magnetic Fieldsmentioning

confidence: 81%

Direct-drive inertial confinement fusion: A review

et al. 2015

View full text Add to dashboard Cite

The direct-drive, laser-based approach to inertial confinement fusion (ICF) is reviewed from its inception following the demonstration of the first laser to its implementation on the present generation of high-power lasers. The review focuses on the evolution of scientific understanding gained from target-physics experiments in many areas, identifying problems that were demonstrated and the solutions implemented. The review starts with the basic understanding of laser–plasma interactions that was obtained before the declassification of laser-induced compression in the early 1970s and continues with the compression experiments using infrared lasers in the late 1970s that produced thermonuclear neutrons. The problem of suprathermal electrons and the target preheat that they caused, associated with the infrared laser wavelength, led to lasers being built after 1980 to operate at shorter wavelengths, especially 0.35 μm—the third harmonic of the Nd:glass laser—and 0.248 μm (the KrF gas laser). The main physics areas relevant to direct drive are reviewed. The primary absorption mechanism at short wavelengths is classical inverse bremsstrahlung. Nonuniformities imprinted on the target by laser irradiation have been addressed by the development of a number of beam-smoothing techniques and imprint-mitigation strategies. The effects of hydrodynamic instabilities are mitigated by a combination of imprint reduction and target designs that minimize the instability growth rates. Several coronal plasma physics processes are reviewed. The two-plasmon–decay instability, stimulated Brillouin scattering (together with cross-beam energy transfer), and (possibly) stimulated Raman scattering are identified as potential concerns, placing constraints on the laser intensities used in target designs, while other processes (self-focusing and filamentation, the parametric decay instability, and magnetic fields), once considered important, are now of lesser concern for mainline direct-drive target concepts. Filamentation is largely suppressed by beam smoothing. Thermal transport modeling, important to the interpretation of experiments and to target design, has been found to be nonlocal in nature. Advances in shock timing and equation-of-state measurements relevant to direct-drive ICF are reported. Room-temperature implosions have provided an increased understanding of the importance of stability and uniformity. The evolution of cryogenic implosion capabilities, leading to an extensive series carried out on the 60-beam OMEGA laser [Boehly et al., Opt. Commun. 133, 495 (1997)], is reviewed together with major advances in cryogenic target formation. A polar-drive concept has been developed that will enable direct-drive–ignition experiments to be performed on the National Ignition Facility [Haynam et al., Appl. Opt. 46(16), 3276 (2007)]. The advantages offered by the alternative approaches of fast ignition and shock ignition and the issues associated with these concepts are described. The lessons learned from target-physics and implosion experiments are taken into account in ignition and high-gain target designs for laser wavelengths of 1/3 μm and 1/4 μm. Substantial advances in direct-drive inertial fusion reactor concepts are reviewed. Overall, the progress in scientific understanding over the past five decades has been enormous, to the point that inertial fusion energy using direct drive shows significant promise as a future environmentally attractive energy source.

show abstract

“…Moreover, we have obtained the growth rate of the magnetic field which is generated inside the plasma due to weakly nonlinear localization of high frequency field. It is to be mentioned that there are several mechanisms of generation of magnetic field in laboratory and space plasma [14][15][16]. In hot astrophysical bodies, the dynamo effect is one of the main sources of magnetic field generation [17,18].…”

Section: Introductionmentioning

confidence: 99%

Propagation of waves in a multicomponent plasma having charged dust particles

2001

View full text Add to dashboard Cite

Propagation of both low and high frequency waves in a plasma consisting of electrons, ions, positrons and charged dust particles have been theoretically studied. The characteristics of dust acoustic wave propagating through the plasma has been analysed and the dispersion relation deduced is a generalization of that obtained by previous authors. It is found that nonlinear localization of high frequency electromagnetic field in such a plasma generates magnetic field. This magnetic field is seen to depend on the temperatures of electrons and positrons and also on their equilibrium density ratio. It is suggested that the present model would be applicable to find the magnetic field generation in space plasma.

show abstract

Studies of Spontaneous Magnetic Fields in Laser-Produced Plasmas by Faraday Rotation

Cited by 169 publications

References 12 publications

Review on spontaneous magnetic fields in laser-produced plasmas: Phenomena and measurements

Review on spontaneous magnetic fields in laser-produced plasmas: Phenomena and measurements

Direct-drive inertial confinement fusion: A review

Propagation of waves in a multicomponent plasma having charged dust particles

Contact Info

Product

Resources

About