Compressing magnetic fields with high-energy lasers

Knauer, J. P.; Gotchev, O. V.; Chang, P. Y.; Meyerhofer, D. D.; Polomarov, O.; Betti, R.; Frenje, J. A.; Li, C. K.; Manuel, M. J.-E.; Petrasso, R. D.; Rygg, J. R.; Séguin, F. H.
May 2010
Physics of Plasmas;May2010, Vol. 17 Issue 5, p056318
Academic Journal
Laser-driven magnetic-field compression producing a magnetic field of tens of megaGauss is reported for the first time. A shock wave formed during the implosion of a cylindrical target traps an initial (seed) magnetic field that is amplified via conservation of magnetic flux. Such large fields are expected to magnetize the electrons in the hot, central plasma, leading to a cyclotron frequency exceeding the collision frequency. The Omega Laser Facility [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] was used to implode cylindrical CH targets filled with deuterium gas and seeded with an external field (>50 kG) from a magnetic pulse generator. This seed field is trapped and rapidly compressed by the imploding shell, minimizing the effect of resistive flux diffusion. The compressed field was probed via proton deflectrometry using 14.7 MeV protons from the D+3He fusion reaction emitted by an imploding glass microballoon. Line-averaged magnetic fields of the imploded core were measured to between 30 and 40 MG. Experimental data were analyzed with both a magnetohydrodynamic version of the one-dimensional hydrocode LILAC [J. Delettrez et al., Phys. Rev. A 36, 3926 (1987); N. W. Jang et al., Bull. Am. Phys. Soc. 51, 144 (2006)] and the particle propagation code GEANT4 [S. Agostinelli et al., Nucl. Instrum. Methods Phys. Res. A 506, 250 (2003)].


Related Articles

  • Effect of the Magnetic Field on the Energy of Deuterium Ions Accelerated in the Collision of Magnetosonic Shock Waves. Dudkin, G. N.; Nechaev, B. A.; Padalko, V. N. // Plasma Physics Reports;Feb2000, Vol. 26 Issue 2, p129 

    A study is made of the effect of the initial magnetic field magnitude on the energy of deuterium ions accelerated in the collision of two magnetosonic shock waves propagating in a deuterium plasma quasi-perpendicularly to the magnetic field. Experiments were carried out at a constant plasma...

  • Slow Nonlinear Waves in Magnetic Flux Tubes. Zhugzhda, Yu. D. // Plasma Physics Reports;Sep2005, Vol. 31 Issue 9, p730 

    A theory of weakly nonlinear slow waves in magnetic flux tubes is developed in the ideal MHD approximation. Fairly simple approximate dispersion relations are derived that are valid for waves of arbitrary wavelength. These dispersion relations make it possible to obtain a number of new model...

  • Magnetic reconnection with space and time varying reconnection rates in a compressible plasma. Semenov, Vladimir S.; Heyn, Martin F.; Ivanov, Ivan B. // Physics of Plasmas;Jan2004, Vol. 11 Issue 1, p62 

    Fast magnetic reconnection of Petschek-type including moving shock waves and discontinuities in a compressible plasma is studied. Magnetic flux tubes of finite size are reconnected by a localized dissipative electric field pulse. This process generates nonlinear perturbations propagating along...

  • Method of generating a mega-ampere current pulse to accelerate a liner by a magnetic field. Duday, P.; Zimenkov, A.; Ivanov, V.; Kraev, A.; Pak, S.; Skobelev, A.; Fevralev, A. // Journal of Applied Mechanics & Technical Physics;Jan2015, Vol. 56 Issue 1, p103 

    This paper describes a method and device for generating a mega-ampere quasi-trapezoidal current pulse of given amplitude and duration in a liner load. The experimental device consisting of a current source based on a helical explosive magnetic generator (HEMG) produced a current pulse in the...

  • Shock wave propagation in a magnetic flux tube. Ferriz-Mas, A.; Moreno-Insertis, F. // Physics of Fluids A;Dec92, Vol. 4 Issue 12, p2700 

    The propagation of a shock wave in a magnetic flux tube is studied within the framework of the Brinkley�Kirkwood theory adapted to a radiating gas. Simplified thermodynamic paths along which the compressed plasma returns to its initial state are considered. It is assumed that the...

  • Local surface equilibrium equations for currentless magnetic configurations. Skovoroda, A. A. // Plasma Physics Reports;Feb2009, Vol. 35 Issue 2, p99 

    Invariant local surface equilibrium equations are derived that interrelate the absolute value of the magnetic field B, the absolute value of the gradient of the magnetic flux |∇Φ|, the local shear s, and the plasma pressure on nested equilibrium magnetic surfaces in currentless...

  • Relativistic laser-matter interaction and relativistic laboratory astrophysics. Bulanov, S. V.; Esirkepov, T. Zh.; Habs, D.; Pegoraro, F.; Tajima, T. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Mar2010, Vol. 55 Issue 2, p483 

    The paper is devoted to the prospects of using the laser radiation interaction with plasmas in the laboratory relativistic astrophysics context. We discuss the dimensionless parameters characterizing the processes in the laser and astrophysical plasmas and emphisize a similarity between the...

  • Critical turbulent energy reductions in plasmas using weak magnetic fields. Raynor, Chavis T.; Mezonlin, Ephrem D.; Johnson, Joseph A. // Journal of Applied Physics;Feb2009, Vol. 105 Issue 4, pN.PAG 

    With an arc-driven shock tube, laser induced fluorescence, and a multipoint density diagnostic technique, we study the turbulence behind an ionizing shock wave in the presence of a magnetic field. The magnetic field is directed either parallel to or antiparallel to the direction of the shock...

  • Generation of scaled protogalactic seed magnetic fields in laser-produced shock waves. Gregori, G.; Ravasio, A.; Murphy, C. D.; Schaar, K.; Baird, A.; Bell, A. R.; Benuzzi-Mounaix, A.; Bingham, R.; Constantin, C.; Drake, R. P.; Edwards, M.; Everson, E. T.; Gregory, C. D.; Kuramitsu, Y.; Lau, W.; Mithen, J.; Niemann, C.; Park, H.-S.; Remington, B. A.; Reville, B. // Nature;1/26/2012, Vol. 481 Issue 7382, p480 

    The standard model for the origin of galactic magnetic fields is through the amplification of seed fields via dynamo or turbulent processes to the level consistent with present observations. Although other mechanisms may also operate, currents from misaligned pressure and temperature gradients...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics