X-ray polarization spectroscopy to study anisotropic velocity distribution of hot electrons produced by an ultra-high-intensity laser

Journal Article · Mon Mar 15 00:00:00 EDT 2010 · Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print)

DOI:https://doi.org/10.1103/PHYSREVE.81.036410· OSTI ID:21347434

Inubushi, Y ^[1]; Okano, Y; Nishimura, H; Cai, H; Nagatomo, H; Kai, T; Fujioka, S; Nakamura, T; Johzaki, T; Mima, K ^[1]; Kawamura, T ^[2]; Batani, D; Morace, A; Redaelli, R ^[3]; Fourment, C; Santos, J J; Malka, G ^[4]; Boscheron, A; Bonville, O; Grenier, J ^[5]

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1. Institute of Laser Engineering, Osaka University, Suita, Osaka (Japan)
2. Tokyo Institute of Technology, Yokohama, Kanagawa (Japan)
3. Dipartmento di Fisica 'G. Occhialini', University of Milano-Bicocca, Milan (Italy)
4. CELIA, Universite de Bordeaux/CNRS/CEA, Talence (France)
5. CEA/CESTA, Le Barp (France)

The anisotropy of the hot-electron velocity distribution in ultra-high-intensity laser produced plasma was studied with x-ray polarization spectroscopy using multilayer planar targets including x-ray emission tracer in the middle layer. This measurement serves as a diagnostic for hot-electron transport from the laser-plasma interaction region to the overdense region where drastic changes in the isotropy of the electron velocity distribution are observed. These polarization degrees are consistent with analysis of a three-dimensional polarization spectroscopy model coupled with particle-in-cell simulations. Electron velocity distribution in the underdense region is affected by the electric field of the laser and that in the overdense region becomes wider with increase in the tracer depth. A full-angular spread in the overdense region of 22.4 deg.{sub -2.4}{sup +5.4} was obtained from the measured polarization degree.

• OSTI ID: 21347434
• Journal Information: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print), Vol. 81, Issue 3; Other Information: DOI: 10.1103/PhysRevE.81.036410; (c) 2010 The American Physical Society; ISSN 1539-3755
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
07 ISOTOPES AND RADIATION SOURCES
ANISOTROPY
DISTRIBUTION
ELECTRIC FIELDS
ELECTRONS
EMISSION
INTERACTIONS
ISOTROPY
LASER-PRODUCED PLASMA
LASERS
LAYERS
POLARIZATION
SIMULATION
SPECTROSCOPY
THREE-DIMENSIONAL CALCULATIONS
VELOCITY
X RADIATION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
IONIZING RADIATIONS
LEPTONS
PLASMA
RADIATIONS