Non-Maxwellian electron distributions resulting from direct laser acceleration in near-critical plasmas

Toncian T.; Wang C.; McCary E.; Meadows A.; Arefiev A.V.; Blakeney J.; Serratto K.; Kuk D.; Chester C.; Roycroft R.; Gao L.; Fu H.; Yan X.Q.; Schreiber J.; Pomerantz I.; Bernstein A.; Quevedo H.; Dyer G.; Ditmire T.; Hegelich B.M.

doi:10.1016/j.mre.2015.11.001

Volume 1 Issue 1

Jan. 2016

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Toncian T., Wang C., McCary E., Meadows A., Arefiev A.V., Blakeney J., Serratto K., Kuk D., Chester C., Roycroft R., Gao L., Fu H., Yan X.Q., Schreiber J., Pomerantz I., Bernstein A., Quevedo H., Dyer G., Ditmire T., Hegelich B.M.. Non-Maxwellian electron distributions resulting from direct laser acceleration in near-critical plasmas[J]. Matter and Radiation at Extremes, 2016, 1(1). doi: 10.1016/j.mre.2015.11.001

Citation:

Toncian T., Wang C., McCary E., Meadows A., Arefiev A.V., Blakeney J., Serratto K., Kuk D., Chester C., Roycroft R., Gao L., Fu H., Yan X.Q., Schreiber J., Pomerantz I., Bernstein A., Quevedo H., Dyer G., Ditmire T., Hegelich B.M.. Non-Maxwellian electron distributions resulting from direct laser acceleration in near-critical plasmas[J]. Matter and Radiation at Extremes, 2016, 1(1). doi: 10.1016/j.mre.2015.11.001

Citation:

Toncian T., Wang C., McCary E., Meadows A., Arefiev A.V., Blakeney J., Serratto K., Kuk D., Chester C., Roycroft R., Gao L., Fu H., Yan X.Q., Schreiber J., Pomerantz I., Bernstein A., Quevedo H., Dyer G., Ditmire T., Hegelich B.M.. Non-Maxwellian electron distributions resulting from direct laser acceleration in near-critical plasmas[J]. Matter and Radiation at Extremes, 2016, 1(1). doi: 10.1016/j.mre.2015.11.001

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Non-Maxwellian electron distributions resulting from direct laser acceleration in near-critical plasmas

doi: 10.1016/j.mre.2015.11.001

1.
aDepartment of Physics, University of Texas, Austin, TX, 78712, USA
2.
bState Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871, China
3.
cFakultat fur Physik, Ludwig-Maximilians-University, Munich, Germany

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Corresponding author: *Corresponding author. E-mail address: toma.toncian@austin.utexas.edu (T. Toncian).
Received Date: 2015-10-31
Accepted Date: 2015-12-03

Available Online: 2021-12-07

Publish Date: 2016-01-15

Abstract

Abstract

The irradiation of few-nm-thick targets by a finite-contrast high-intensity short-pulse laser results in a strong pre-expansion of these targets at the arrival time of the main pulse. The targets decompress to near and lower than critical densities with plasmas extending over few micrometers, i.e. multiple wavelengths. The interaction of the main pulse with such a highly localized but inhomogeneous target leads to the generation of a short channel and further self-focusing of the laser beam. Experiments at the Glass Hybrid OPCPA Scaled Test-bed (GHOST) laser system at University of Texas, Austin using such targets measured non-Maxwellian, peaked electron distribution with large bunch charge and high electron density in the laser propagation direction. These results are reproduced in 2D PIC simulations using the EPOCH code, identifying direct laser acceleration (DLA) [1] as the responsible mechanism. This is the first time that DLA has been observed to produce peaked spectra as opposed to broad, Maxwellian spectra observed in earlier experiments [2]. This high-density electrons have potential applications as injector beams for a further wakefield acceleration stage as well as for pump-probe applications.
- Direct laser acceleration,
- Electron acceleration,
- Near critical plasmas,
- PIC simulations

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References(27)

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