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Magnetic collimation of fast electrons in specially engineered targets irradiated by ultraintense laser pulses
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10.1063/1.3553453
/content/aip/journal/pop/18/2/10.1063/1.3553453
http://aip.metastore.ingenta.com/content/aip/journal/pop/18/2/10.1063/1.3553453
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

A view of initial plasma density in logarithm scale. (a) is for the high-density-core target and (b) is for the low-density-core target. Here the density is normalized by the critical density .

Image of FIG. 2.
FIG. 2.

Electron energy density in logarithm scale for [(a) and (c)] high-density-core target and [(b) and (d)] low-density-core target at time . (a) and (b) are for the collisionless cases and (c) and (d) are for the collisional cases. Here, the electron energy density is normalized by .

Image of FIG. 3.
FIG. 3.

Contours of spontaneous magnetic fields for [(a) and (c)] high-density-core target and [(b) and (d)] low-density-core target at time . (a) and (b) are for the collisionless cases and (c) and (d) are for the collisional cases. The unit of the magnetic field is .

Image of FIG. 4.
FIG. 4.

Typical trajectories of the fast electrons for high-density-core target (a) with collision and (b) without collision, showing the guiding and collimation of the electrons. Initially, the fast electrons are sampled randomly in the overdense plasma region near the laser plasma interfaces.

Image of FIG. 5.
FIG. 5.

The initial profile of the plasma density in logarithm scale of the low-density-core-high-density-cladding structure target. Here the density is normalized by the critical density .

Image of FIG. 6.
FIG. 6.

Electron energy density in logarithm scale at two different times [(a) and (c)] and [(b) and (d)] . (a) and (b) are for the collisionless cases and (c) and (d) are for collisional cases. Here the electron energy density is normalized by .

Image of FIG. 7.
FIG. 7.

The spontaneous magnetic fields at times [(a) and (c)] and [(b) and (d)] . (a) and (b) are for the collisionless cases and (c) and (d) are for the collisional cases. The solid line on (b) is a slice of spontaneous magnetic fields in simulation at , the dashed line for the analytical result. Here, the magnetic fields are averaged over one laser period. The unit of the magnetic field is .

Image of FIG. 8.
FIG. 8.

(a) The electron energy density in logarithm scale and (b) spontaneous magnetic field for the case irradiated by a larger spot size laser with (FWHM) at time . Here the electron energy density is normalized by .

Image of FIG. 9.
FIG. 9.

(a) Peak spontaneous magnetic field as a function of the incident laser intensity. Here, the plasma density is fixed with . (b) Peak spontaneous magnetic field as a function of the plasma density. Here the laser intensity is fixed with . Solid lines are derived from Eq. (3), and squares denote the peak magnetic field obtained from PIC simulation. The simulation data are the average of the maximum values of all slices between .

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/content/aip/journal/pop/18/2/10.1063/1.3553453
2011-02-09
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetic collimation of fast electrons in specially engineered targets irradiated by ultraintense laser pulses
http://aip.metastore.ingenta.com/content/aip/journal/pop/18/2/10.1063/1.3553453
10.1063/1.3553453
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