scholarly journals Experimental study of X-ray emission from laser-irradiated planar targets on “Mishen” Facility

1992 ◽  
Vol 10 (4) ◽  
pp. 753-758 ◽  
Author(s):  
V. A. Bolotin ◽  
I. N. Burdonskii ◽  
V. V. Gavrilov ◽  
A. Yu. Gol'tsov ◽  
S. V. Zavyalets ◽  
...  
Keyword(s):  
Experimental Study ◽  
Energy Transfer ◽  
Conversion Efficiency ◽  
Spectral Resolution ◽  
Line Emission ◽  
Laser Pulses ◽  
Temporal Analysis ◽  
Ablation Rate ◽  
X Ray

X-ray emission from planar targets irradiated by 1.054-μm laser pulses was observed with temporal, spatial, and spectral resolution. The main purpose of these measurements was the investigation of energy transfer in multilayer targets and X-ray conversion efficiency. A mass ablation rate was determined from temporal analysis of multicharged ion line emission and a key role of corona X-ray emission in accelerated material preheating was established.

X-ray conversion of ultra-short laser pulses on a solid sample: Role of electron waves excited in the pre-plasma

2014 ◽  
Vol 21 (7) ◽  
pp. 072108 ◽  
Author(s):  
F. Baffigi ◽  
G. Cristoforetti ◽  
L. Fulgentini ◽  
A. Giulietti ◽  
P. Koester ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Solid Sample ◽  
X Ray ◽  
Short Laser Pulses

scholarly journals Investigation of soft X-ray emission from Ar clusters heated by ultrashort laser pulses

2002 ◽  
Vol 20 (1) ◽  
pp. 51-57 ◽  
Author(s):  
T. MOCEK ◽  
C.M. KIM ◽  
H.J. SHIN ◽  
D.G. LEE ◽  
Y.H. CHA ◽  
...  
Keyword(s):  
Line Emission ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Spectral Lines ◽  
Gas Temperature ◽  
X Ray ◽  
Charge States ◽  
Ar Gas ◽  
Collisional Ionization ◽  
Collisional Heating

We report soft X-ray spectra (4–18 nm) produced by the interaction of 25–100-fs laser pulses at an intensity of up to 7 × 1016 W/cm2 with a cryogenically cooled Ar gas jet. New spectral lines from Ar8+, Ar9+, and Ar10+ charge states appeared with decreasing preexpansion gas temperature. A nonlinear increase of X-ray line emission from Ar7+, Ar8+, and Ar9+ was observed with cooling, which saturated below a certain temperature. The drastic change in the spectrum is attributed to efficient collisional heating and collisional ionization of growing, small- to medium-sized (102–103 atoms) Ar clusters from the cooled jet. When the laser pulse was extended from 25 to 100 fs we observed considerably stronger emission on lines from high charge states, such as Ar8+, Ar9+, and Ar10+, which suggests that the resonance absorption condition could be reached for the 100-fs pulse.

scholarly journals Models of coronal heating, turbulence and fast reconnection

2015 ◽  
Vol 373 (2042) ◽  
pp. 20140262 ◽  
Author(s):  
M. Velli ◽  
F. Pucci ◽  
F. Rappazzo ◽  
A. Tenerani
Keyword(s):  
Energy Transfer ◽  
Magnetic Fields ◽  
Mass Loss ◽  
Coronal Heating ◽  
The Sun ◽  
X Ray ◽  
Magnetically Confined ◽  
Small Scales ◽  
Fast Reconnection

Coronal heating is at the origin of the EUV and X-ray emission and mass loss from the sun and many other stars. While different scenarios have been proposed to explain the heating of magnetically confined and open regions of the corona, they must all rely on the transfer, storage and dissipation of the abundant energy present in photospheric motions, which, coupled to magnetic fields, give rise to the complex phenomenology seen at the chromosphere and transition region (i.e. spicules, jets, ‘tornadoes’). Here we discuss models and numerical simulations which rely on magnetic fields and electric currents both for energy transfer and for storage in the corona. We will revisit the sources and frequency spectrum of kinetic and electromagnetic energies, the role of boundary conditions, and the routes to small scales required for effective dissipation. Because reconnection in current sheets has been, and still is, one of the most important processes for coronal heating, we will also discuss recent aspects concerning the triggering of reconnection instabilities and the transition to fast reconnection.

scholarly journals Investigation of laser-produced chlorine plasma radiation for non-monochromatic X-ray scattering experiments

2006 ◽  
Vol 24 (3) ◽  
pp. 335-345 ◽  
Author(s):  
M. SCHOLLMEIER ◽  
G. RODRÍGUEZ PRIETO ◽  
F.B. ROSMEJ ◽  
G. SCHAUMANN ◽  
A. BLAZEVIC ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Pyrolytic Graphite ◽  
Line Emission ◽  
Plasma Radiation ◽  
High Spectral Resolution ◽  
Crystal Spectrometer ◽  
X Ray ◽  
Dense Plasmas ◽  
X Ray Scattering ◽  
Ray Scattering

The chlorine Heαradiation of polyvinyl chloride (PVC) was investigated with respect to X-ray scattering experiments on dense plasmas. The X-ray source was a laser-produced plasma that was observed with a highly reflective highly oriented pyrolytic graphite (HOPG) crystal spectrometer as it is used in current x-ray scattering experiments on dense plasmas. The underlying dielectronic satellites of Heαcannot be resolved, therefore the plasma was observed at the same time with a focusing spectrometer with spatial resolution. To reconstruct the spectrum a simple model to calculate the spectral line emission based on dielectronic recombination and inner shell excitation of helium- and lithium-like ions was used. The analysis shows that chlorine dielectronic satellite emission is intense compared to Heαin laser-produced chlorine plasmas with a temperature of 300 eV in this wavelength range of Δλ = 0.07 Å (ΔE= 43 eV). The method proposed in this paper allows deducing experimentally the role of the underlying dielectronic satellites in the scatter spectrum measured with a HOPG crystal spectrometer. It is shown that the dielectronic satellites can be neglected when the scattering is measured with low spectral resolution in the non-collective regime. They are of major importance in the collective scatter regime where a high spectral resolution is necessary.

High Kα x-ray conversion efficiency from extended source gas jet targets irradiated by ultra short laser pulses

2008 ◽  
Vol 92 (24) ◽  
pp. 241504 ◽  
Author(s):  
N. L. Kugland ◽  
C. G. Constantin ◽  
P. Neumayer ◽  
H.-K. Chung ◽  
A. Collette ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Laser Pulses ◽  
Gas Jet ◽  
Extended Source ◽  
X Ray ◽  
Short Laser Pulses

scholarly journals X-ray conversion with PHEBUS laser

1999 ◽  
Vol 17 (3) ◽  
pp. 459-463 ◽  
Author(s):  
D. BABONNEAU ◽  
L. BONNET ◽  
S. JACQUEMOT ◽  
J.L. BOCHER ◽  
J.Y. BOUTIN ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Focal Spot ◽  
Transport Coefficients ◽  
Laser Pulses ◽  
Time Resolved ◽  
X Ray ◽  
Solid Liquid

A time-resolved X-ray conversion efficiency campaign was conducted at CEA/Limeil–Valenton on the PHEBUS laser, with Au planar targets. The calibrated diagnostic DEMIXART has measured X-ray emissions driven by shaped laser pulses. The results have been analyzed with the “physicist” 1D1/2 hydrodynamical code CHIVAS, where improved transport coefficients have been implemented. The influence of the degeneracy and solid/liquid corrections on various parameters is shown. Other significant effects due to focal spot shapes and lateral conduction are quantified with the FCI2 hydroradiative code of CEA/DRIF.

Experimental study of K-shell X-ray emission generated from nanowire target irradiated by relativistic laser pulses

2013 ◽  
Vol 11 (3) ◽  
pp. 033501-33503 ◽  
Author(s):  
Ye Tian Ye Tian ◽  
Wentao Wang Wentao Wang ◽  
Cheng Wang Cheng Wang ◽  
Xiaoming Lu Xiaoming Lu ◽  
Cheng Wang Cheng Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Laser Pulses ◽  
X Ray
Sign in / Sign up

Export Citation Format

Share Document