Heidelberg 1999 – wissenschaftliches Programm
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K: Kurzzeitphysik
K 6: Laserstrahl-Wechselwirkungen
K 6.3: Vortrag
Donnerstag, 18. März 1999, 14:30–14:45, GE1
Self-channeling of a high intensity laser pulse in plasma — •Nadeshda Vogel1, Vladimir Skvortsov2, and Natalie Kochan1 — 1Technische 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).