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Heidelberg 1999 – scientific programme

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K: Kurzzeitphysik

K 6: Laserstrahl-Wechselwirkungen

K 6.3: Talk

Thursday, March 18, 1999, 14:30–14:45, GE1

Self-channeling of a high intensity laser pulse in plasma — •Nadeshda Vogel1, Vladimir Skvortsov2, and Natalie Kochan11Technische Universitaet Chemnitz, 09107 Chemnitz — 2High Density Research Center, 127412 Moscow

The excitation of an intense electric and magnetic fields caused

by high density current(up to 600 GA/cm2) of micro electron beams

generated during propagation of a 100 ps laser pulse in air near

an Al-target are investigated experimentally. Measurements of

electron density distribution with high temporal (100 ps) and

spatial resolution (< 1 µm) by interferometry and absorp-

tion photography are presented.It is shown that under certain

conditions a self-channeling of laser beams in a narrow current

channel and particle acceleration can take place. In particularly,

an Al IV-VIII ions can be accelerated up to 4-8 MeV just for

lengths of 100 micrometers primarily due to collective accelera-

tion mechanisms by a space charge of a micro electron beam as

well as a Fermi-like acceleration as result of ion interactions

with a cylindrical wall of self-generated magnetic field ( mea-

sured magnetic field of order of 7.6 MG).

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