Time-dependent X-ray polarization analysis for anisotropic distribution of hot electrons in ultrahigh intensity laser plasmas

2007 ◽  
Vol 3 (1-2) ◽  
pp. 131-135 ◽  
Author(s):  
T. Kai ◽  
T. Kawamura ◽  
Y. Inubushi ◽  
H. Nishimura ◽  
T. Nakamura ◽  
...  
Keyword(s):  
Time Dependent ◽  
Hot Electrons ◽  
Polarization Analysis ◽  
X Ray ◽  
Laser Plasmas ◽  
Intensity Laser

scholarly journals X-ray emission produced by hot electrons from fs-laser produced plasma— diagnostic and application

1999 ◽  
Vol 17 (4) ◽  
pp. 671-679 ◽  
Author(s):  
I. USCHMANN ◽  
P. GIBBON ◽  
D. KLÖPFEL ◽  
T. FEURER ◽  
E. FÖRSTER ◽  
...  
Keyword(s):  
High Energy ◽  
Hot Electrons ◽  
Emission Region ◽  
Single Shot ◽  
X Rays ◽  
Plasma Diagnostic ◽  
Strong Laser Field ◽  
X Ray ◽  
Laser Plasmas ◽  
Fs Laser

High intensity fs-laser pulses can deliver focused intensities in the region of 1016–1019 W/cm2. If the laser pulse is focused onto a solid or gaseous material, a plasma is created. The electrons, as well as the ions are accelerated in the strong laser field up to energies in the range of keV to several MeV. The interaction of the high energy particles with cold material, that is, the solid target yield of intense X-ray emission, K-shell—as well as bremsstrahlung-radiation. The K-shell emission from layered targets is a useful indicator of the production efficiency, energy distribution, and transport of hot electrons produced in fs-laser plasmas. For the diagnosis of laser plasma interaction and its application as an intense X-ray source, the spatial, temporal and spectral distribution of K-shell X rays is of fundamental importance. Focusing crystal spectrographs can be used to obtain a single shot X-ray spectra of laser plasmas produced by table top fs-lasers. With a spatial- and spectral-focusing spectrograph based on a toroidally bent crystal, the emission region of the hot plasma and Kα-radiation can be determined. Recording the spectra online by a frontside illuminated charge-coupled device (CCD) allows alignment of the crystal spectrograph, as well as the laser beam focusing leading to different X-ray source sizes. Using a controlled fs-prepulse, an increase in Kα radiation could be observed with the diagnostic.Measurements of calibrated high resolution spectra are compared with particle-in-cell (PIC) calculations of the laser absorption and hot electron production postprocessed by a Monte–Carlo (MC) transport model of electron stopping and Kα X-ray generation.

scholarly journals Diagnosis of the soft X-ray spectrum emitted by laser-plasmas using a spectroscopic photon sieve

2012 ◽  
Vol 30 (2) ◽  
pp. 313-317 ◽  
Author(s):  
Yulin Gao ◽  
Weimin Zhou ◽  
Lai Wei ◽  
Leifeng Cao ◽  
Xiaoli Zhu ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Laser Plasma ◽  
Higher Order ◽  
X Ray ◽  
Order Diffraction ◽  
Laser Plasmas ◽  
High Intensity Laser ◽  
Photon Sieve ◽  
Laser Facility ◽  
Intensity Laser

AbstractLaser plasma experiments, which demonstrated the single order diffraction property of spectroscopic photon sieve (a novel single-order diffraction grating), were performed on the SILEX-I femto-second laser facility. High-intensity laser radiation was focused onto a Cu target to generate plasma. The spectra of soft X-ray from copper plasmas have been measured with spectroscopic photon sieve based spectrograph. The results show that the spectroscopic photon sieve is able to provide soft X-ray spectrum free from higher-order diffraction components. The measured spectra obtained with such a spectroscopic photon sieve need no unfolding process to extract higher-order diffraction interference.

Diagnostics of Gold Laser Plasmas

1988 ◽  
Vol 102 ◽  
pp. 357-360
Author(s):  
J.C. Gauthier ◽  
J.P. Geindre ◽  
P. Monier ◽  
C. Chenais-Popovics ◽  
N. Tragin ◽  
...  
Keyword(s):  
Experimental Results ◽  
Pure Gold ◽  
Electronic Temperature ◽  
X Ray ◽  
Laser Plasmas ◽  
Collisional Radiative Model ◽  
Radiative Model

AbstractIn order to achieve a nickel-like X ray laser scheme we need a tool to determine the parameters which characterise the high-Z plasma. The aim of this work is to study gold laser plasmas and to compare experimental results to a collisional-radiative model which describes nickel-like ions. The electronic temperature and density are measured by the emission of an aluminium tracer. They are compared to the predictions of the nickel-like model for pure gold. The results show that the density and temperature can be estimated in a pure gold plasma.

The study of time dependent, broadband X-ray emission from ultra-short pulse laser produced plasmas

1994 ◽  
Author(s):  
Ronnie Shepherd ◽  
Rex Booth ◽  
Dwight Price ◽  
Rosemary Walling ◽  
Richard More ◽  
...  
Keyword(s):  
Pulse Laser ◽  
Short Pulse ◽  
Time Dependent ◽  
X Ray ◽  
Short Pulse Laser ◽  
Ultra Short Pulse ◽  
Ultra Short Pulse Laser

X‐ray tomography of hot electrons in the barrier region of the tandem mirror GAMMA 10

1990 ◽  
Vol 67 (4) ◽  
pp. 1694-1699 ◽  
Author(s):  
T. Kondoh ◽  
T. Cho ◽  
M. Hirata ◽  
N. Yamaguchi ◽  
T. Saito ◽  
...  
Keyword(s):  
Hot Electrons ◽  
X Ray ◽  
Tandem Mirror ◽  
Barrier Region

scholarly journals Theoretical and experimental comparative studies of nonlinear optical properties for selected melaminium compounds

2010 ◽  
Vol 8 (6) ◽  
pp. 1192-1202 ◽  
Author(s):  
Marek Drozd ◽  
Mariusz Marchewka
Keyword(s):  
Optical Properties ◽  
Acetic Acid ◽  
Nonlinear Optical ◽  
Time Dependent ◽  
X Ray ◽  
Hartree Fock ◽  
Optical Applications ◽  
Experimental Values ◽  
Nonlinear Optical Applications ◽  
Theoretical Results

AbstractThe bis(melaminium) sulphate dihydrate, 2,4,6-triamine-1,3,5-triazin-1,3-ium tartrate monohydrate, 2,4,6-triamine-1,3,5-triazin-1-ium hydrogenphthalate, 2,4,6-triamine-1,3,5-triazin-1-ium acetate acetic acid solvate monohydrate, 2,4,6-triamine-1,3,5-triazin-1-ium bis(selenate) trihydrate, melaminium diperchlorate hydrate, melaminium bis(trichloroacetate) monohydrate and melaminium bis(4-hydroxybenzenesulphonate) dihydrate were discovered recently as perspective materials for nonlinear optical applications. On the basis of X-ray structures for eight melaminium compounds the time dependent Hartree Fock (TDHF) method was used for calculation of the polarizability, and first and second hyperpolarizability. Detailed directional studies of calculated hyperpolarizability for all investigated melaminium compounds are shown. The theoretical results are compared with experimental values of β.

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