Transport of intense laser-produced electron beams in matter

D. Batani; M. Manclossi; J. J. Santos; V. T. Tikhonchuk; J. Faure; A. Guemnie-Tafo; V. Malka

doi:10.1088/0741-3335/48/12B/S20

Transport of intense laser-produced electron beams in matter

D. Batani, M. Manclossi, J. J. Santos, V. T. Tikhonchuk, J. Faure, A. Guemnie-Tafo, V. Malka

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Abstract

Fast electron transport in matter is a key issue for assessing the feasibility of fast ignition; however several important points are not clear yet. Therefore we realized an experiment with ultra-intense lasers (≤6 10¹⁹ W cm^-2) studying transport in metallic (Al) and insulating (CH) foil targets. The dynamics of fast electron propagation versus target thickness was investigated by optical selfemission from targets rear side. In Al targets we distinguished two-components in the fast electron population: moderately relativistic electrons and a highly collimated micro-bunched relativistic tail. A large ohmic heating at the rear of the thinner targets was observed due to the background return current. In CH, optical emission is mainly due to the Cherenkov effect and is much larger than in Al. We also observed that in insulators the fast-electron beam undergoes strong filamentation and the number of filaments increases with thickness. This behaviour was attributed to an ionization front instability.

Original language	English
Pages (from-to)	B211-B220
Journal	Plasma Physics and Controlled Fusion
Volume	48
Issue number	12 B
DOIs	https://doi.org/10.1088/0741-3335/48/12B/S20
Publication status	Published - 1 Dec 2006

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title = "Transport of intense laser-produced electron beams in matter",

abstract = "Fast electron transport in matter is a key issue for assessing the feasibility of fast ignition; however several important points are not clear yet. Therefore we realized an experiment with ultra-intense lasers (≤6 1019 W cm-2) studying transport in metallic (Al) and insulating (CH) foil targets. The dynamics of fast electron propagation versus target thickness was investigated by optical selfemission from targets rear side. In Al targets we distinguished two-components in the fast electron population: moderately relativistic electrons and a highly collimated micro-bunched relativistic tail. A large ohmic heating at the rear of the thinner targets was observed due to the background return current. In CH, optical emission is mainly due to the Cherenkov effect and is much larger than in Al. We also observed that in insulators the fast-electron beam undergoes strong filamentation and the number of filaments increases with thickness. This behaviour was attributed to an ionization front instability.",

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T1 - Transport of intense laser-produced electron beams in matter

AU - Batani, D.

AU - Manclossi, M.

AU - Santos, J. J.

AU - Tikhonchuk, V. T.

AU - Faure, J.

AU - Guemnie-Tafo, A.

AU - Malka, V.

PY - 2006/12/1

Y1 - 2006/12/1

N2 - Fast electron transport in matter is a key issue for assessing the feasibility of fast ignition; however several important points are not clear yet. Therefore we realized an experiment with ultra-intense lasers (≤6 1019 W cm-2) studying transport in metallic (Al) and insulating (CH) foil targets. The dynamics of fast electron propagation versus target thickness was investigated by optical selfemission from targets rear side. In Al targets we distinguished two-components in the fast electron population: moderately relativistic electrons and a highly collimated micro-bunched relativistic tail. A large ohmic heating at the rear of the thinner targets was observed due to the background return current. In CH, optical emission is mainly due to the Cherenkov effect and is much larger than in Al. We also observed that in insulators the fast-electron beam undergoes strong filamentation and the number of filaments increases with thickness. This behaviour was attributed to an ionization front instability.

AB - Fast electron transport in matter is a key issue for assessing the feasibility of fast ignition; however several important points are not clear yet. Therefore we realized an experiment with ultra-intense lasers (≤6 1019 W cm-2) studying transport in metallic (Al) and insulating (CH) foil targets. The dynamics of fast electron propagation versus target thickness was investigated by optical selfemission from targets rear side. In Al targets we distinguished two-components in the fast electron population: moderately relativistic electrons and a highly collimated micro-bunched relativistic tail. A large ohmic heating at the rear of the thinner targets was observed due to the background return current. In CH, optical emission is mainly due to the Cherenkov effect and is much larger than in Al. We also observed that in insulators the fast-electron beam undergoes strong filamentation and the number of filaments increases with thickness. This behaviour was attributed to an ionization front instability.

U2 - 10.1088/0741-3335/48/12B/S20

DO - 10.1088/0741-3335/48/12B/S20

M3 - Article

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SN - 0741-3335

VL - 48

SP - B211-B220

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 12 B

ER -

Transport of intense laser-produced electron beams in matter

Abstract

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