Fast ignitor research at the Institute of Laser Engineering, Osaka University

Citation
R. Kodama et al., Fast ignitor research at the Institute of Laser Engineering, Osaka University, PHYS PLASMA, 8(5), 2001, pp. 2268-2274
Citations number
27
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS OF PLASMAS
ISSN journal
1070-664X → ACNP
Volume
8
Issue
5
Year of publication
2001
Part
2
Pages
2268 - 2274
Database
ISI
SICI code
1070-664X(200105)8:5<2268:FIRATI>2.0.ZU;2-F
Abstract
The physics element relevant to the fast ignitor in inertial confinement fu sion has been extensively studied. Laser-hole boring with enormous photon p ressures into overcritical densities was experimentally proved by density m easurements with XUV laser probing. Ultra-intense laser interactions at a r elativistic parameter regime were studied with a 50-TW glass laser system a nd a 100-TW glass laser system synchronized with a long pulse laser system. In the study of relativistic laser beam propagation in a 100-mum scale-len gth plasma, a special propagation mode (super-penetration mode) was observe d, where the beam propagated into overdense regions close to the solid targ et surface. At the super-penetration mode, 20% of the laser energy converte d to energetic electrons toward the target inside, while the coupling effic iency was 40% without the long scale-length plasmas. The high-density energ etic electron transport and heating of solid material was also studied, ind icating beamlike propagation of the energetic electrons in the solid target and effective heating of solid density ions with the electrons. Based on t hese basic experimental results, the heating of imploded plasma by short-pu lse-laser light with three different ways of injecting the heating pulse ha s been studied. (C) 2001 American Institute of Physics.