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Wave-breaking injection of electrons to a laser wake field in plasma channels at the strong focusing regime
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10.1063/1.2357594
/content/aip/journal/pop/13/10/10.1063/1.2357594
http://aip.metastore.ingenta.com/content/aip/journal/pop/13/10/10.1063/1.2357594
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Initial electron density distribution with a plasma channel of diameter. Top and bottom values of electron density in the channel are and , respectively.

Image of FIG. 2.
FIG. 2.

Spatial distributions of (1a) the component of the electric field in the plasma, (1b) the component of the laser electric field, and (1c) the normalized electron density at after the laser injection into plasma. (2a), (2b), and (2c) are at as well; (3a), (3b), and (3c) at ; and (4a), (4b), and (4c) at , respectively. Laser intensity is . We can see focusing and defocusing of the laser pulse passing through the channel. Electron injection occurs rapidly only when the laser pulse is focused.

Image of FIG. 3.
FIG. 3.

(a) Spatial distributions of electron longitudinal momentum and (b) electron energy distribution at after the laser injection into plasma and the laser intensity is .

Image of FIG. 4.
FIG. 4.

Spatial distributions of (1a) the component of the electric field in the plasma, (1b) the component of the laser electric field, and (1c) the normalized electron density at after the laser injection into plasma. (2a), (2b), and (2c) are at as well; (3a), (3b), and (3c) at ; and (4a), (4b), and (4c) at , respectively. Laser intensity is . We also can see focusing and defocusing of the laser pulse passing through the channel, though electron injection occurs all the way.

Image of FIG. 5.
FIG. 5.

(a) Spatial distributions of electron longitudinal momentum and (b) electron energy distribution at after the laser injection into plasma and the laser intensity is .

Image of FIG. 6.
FIG. 6.

Electron energy distributions at after the laser injection into plasma and the laser intensity of (solid line) and (dotted line). The maximum energy increases from and the total charge of accelerated electrons with energy over becomes 25 times with an increase of the laser intensity from .

Image of FIG. 7.
FIG. 7.

Initial electron density distribution with a plasma channel of diameter. Top and bottom values of electron density in the channel are and , respectively. Laser intensity is . The laser pulse goes into plasma with the angle of 6° to the direction.

Image of FIG. 8.
FIG. 8.

Spatial distributions of (1a) the component of the electric field in the plasma, (1b) the component of the laser electric field, and (1c) the normalized electron density at after the laser injection into plasma. (2a), (2b), and (2c) are at as well; (3a), (3b), and (3c) at ; and (4a), (4b), and (4c) at , respectively. Laser intensity is . We can see reflection of the laser pulse passing through the channel. Electron injection occurs rapidly only when the laser pulse is focused onto the side of the channel.

Image of FIG. 9.
FIG. 9.

(a) Spatial distributions of electron longitudinal momentum and (b) electron energy distribution at after the laser injection into plasma with the angle of 6° to the direction.

Image of FIG. 10.
FIG. 10.

Initial electron density distribution with a plasma channel of diameter. Top and bottom values of electron density in the channel are and , respectively. An -polarized laser pulse is injected into capillary-like plasma and the laser intensity is .

Image of FIG. 11.
FIG. 11.

Electron density distribution in the - plane at (a) , (b) , (c) , and (d) after the laser pulse entering into the plasma slab. Initial laser intensity is . It increases up to due to the pulse self-focusing, which leads to the wake-wave narrowing seen in frame (b). A trapped electron bunch at first is injected into the second period of the wake field (b), then the electron injection occurs in the first wake-field period (c). Rather large transverse excursion of the accelerated electrons is due to effects of their injection during the transverse wake-wave breaking.

Image of FIG. 12.
FIG. 12.

(a) Electron phase plane, , and (b) electron energy spectrum, at after the laser entering into the plasma slab for the laser intensity equal to .

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/content/aip/journal/pop/13/10/10.1063/1.2357594
2006-10-09
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Wave-breaking injection of electrons to a laser wake field in plasma channels at the strong focusing regime
http://aip.metastore.ingenta.com/content/aip/journal/pop/13/10/10.1063/1.2357594
10.1063/1.2357594
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