Hybrid simulations of fast electron transport in conducting media

Honrubia, J. J.; Antonicci, A.; Moreno, Daniel

doi:10.1017/s0263034604222078

Cited by 44 publications

(35 citation statements)

References 13 publications

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“…By ignoring electron inertia, we remove time scales proportional to ω −1 pe from the problem. This assumption, which is the common basis of various approaches similar to ours [9][10][11], is justified under circumstances where (1) the collision frequency becomes comparable to the local plasma frequency, and (2) the density of fast particles is negligible compared to the cold background so that fast particles do not produce a significant charge separation field [12]. Figure 4(a) shows the result of a 1D simulation of the same problem as discussed in Fig.…”

Section: Hybrid Modelmentioning

confidence: 93%

Integrated kinetic simulation of laser-plasma interactions, fast-electron generation, and transport in fast ignition

2010

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We present new results on the physics of short-pulse laser-matter interaction of kilojoulepicosecond pulses at full spatial and temporal scale, using a new approach that combines a 3D collisional electromagnetic Particle-in-Cell code with an MHD-hybrid model of high-density plasma. In the latter, collisions damp out plasma waves, and an Ohm's law with electron inertia effects neglected determines the electric field. In addition to yielding orders of magnitude in speed-up while avoiding numerical instabilities, this allows us to model the whole problem in a single unified framework: the laser-plasma interaction at sub-critical densities, energy deposition at relativistic critical densities, and fast-electron transport in solid densities. Key questions such as the multi-picosecond temporal evolution of the laser energy conversion into hot electrons, the impact of return currents on the laser-plasma interaction, and the effect of self-generated electric and magnetic fields on electron transport will be addressed. We will report applications to current experiments.

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Section: Hybrid Modelmentioning

confidence: 93%

Integrated kinetic simulation of laser-plasma interactions, fast-electron generation, and transport in fast ignition

2010

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“…Tikhonchuk [16] explicitly calculates charge separation and electrostatic fields through Poisson equation. However, most computer models [17][18][19] neglect electrostatic fields; inductive fields play the main role, a reasonable assumption in conductors but probably not in insulators.…”

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confidence: 99%

Ultraintense Laser-Produced Fast-Electron Propagation in Gas Jets

et al. 2005

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We study the propagation of fast electrons in a gas at different densities. A large relativistic electron current is produced by focusing a short-pulse ultrahigh-intensity laser on a metallic target. It then propagates in a gas jet placed behind the foil. Shadowgraphy in the gas shows an electron cloud moving at sub-relativistic average velocities. The experiment shows (i) the essential role of the density of background material for allowing propagation of fast electrons, (ii) the importance of the ionization phase which produces free electrons available for the return current, and (iii) the effect of electrostatic fields on fast-electron propagation.

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“…The issue of fast electron transport in high-density matter is currently receiving a growing attention, both from a theoretical [1][2][3][4][5][6] and an experimental viewpoint, 7, 8 even in view of its crucial role in the fast ignitor approach to the Inertial Confinement Fusion. [9][10][11][12][13] Indeed, as it is well known, within this scheme the ignition of a small hot spot, having linear dimensions of the order of 10 μm, in the pre-compressed DT fuel is expected to be reached by means of the energy deposition by a high-current (well beyond the Alfvèn limit) beam of relativistic electrons, with kinetic energy E k 1 MeV.…”

Section: Introductionmentioning

confidence: 99%

A novel single-shot, spectrally resolved x-ray imaging technique of ICF relevant plasmas

Labate

Cecchetti

Ciricosta³

et al. 2011

SPIE Proceedings

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A new diagnostic tool has recently been developed, which allows to get 2D images of X-ray sources with simultaneous energy encoded information. This is achieved by using a pinhole camera scheme in which a CCD camera, forced to operate in the single-photon regime, is used as a detector. The use of this method, initially limited to a single pinhole, multi-shot basis, has recently been extended to single-shot experiments typical of large scale installations using custom pinhole arrays of sub-10μm diameter. Preliminary tests have been carried out at the PALS facility and the diagnostics has been successfully employed in a PW environment in a recent experiment at RAL. The details of the method as well as some results from such recent experiments will be given.

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Hybrid simulations of fast electron transport in conducting media

Cited by 44 publications

References 13 publications

Integrated kinetic simulation of laser-plasma interactions, fast-electron generation, and transport in fast ignition

Integrated kinetic simulation of laser-plasma interactions, fast-electron generation, and transport in fast ignition

Ultraintense Laser-Produced Fast-Electron Propagation in Gas Jets

A novel single-shot, spectrally resolved x-ray imaging technique of ICF relevant plasmas

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