scholarly journals Method for Measuring the Laser Field and the Opacity of Spectral Lines in Plasmas

Plasma ◽  
2021 ◽  
Vol 4 (1) ◽  
pp. 65-74
Author(s):  
Eugene Oks
Keyword(s):  
Laser Radiation ◽  
Laser Plasma ◽  
Laser Field ◽  
Experimental Studies ◽  
Critical Density ◽  
Experimental Spectrum ◽  
Spectral Lines ◽  
Plasma Interactions ◽  
Laser Plasma Interactions ◽  
Transverse Electromagnetic

In experimental studies of laser-plasma interactions, the laser radiation can exist inside plasma regions where the electron density is below the critical density (“underdense” plasma), as well as at the surface of the critical density. The surface of the critical density could exhibit a rich physics. Namely, the incident laser radiation can get converted in transverse electromagnetic waves of significantly higher amplitudes than the incident radiation, due to various nonlinear processes. We proposed a diagnostic method based on the laser-produced satellites of hydrogenic spectral lines in plasmas. The method allows measuring both the laser field (or more generally, the field of the resulting transverse electromagnetic wave) and the opacity from experimental spectrum of a hydrogenic line exhibiting satellites. This spectroscopic diagnostic should be useful for a better understanding of laser-plasma interactions, including relativistic laser-plasma interactions.

Increased Hot-Electron Production at Quarter-Critical Density in Long-Scale-Length Laser-Plasma Interactions

1985 ◽  
Vol 54 (23) ◽  
pp. 2509-2512 ◽  
Author(s):  
F. C. Young ◽  
M. J. Herbst ◽  
C. K. Manka ◽  
S. P. Obenschain ◽  
J. H. Gardner
Keyword(s):  
Laser Plasma ◽  
Critical Density ◽  
Hot Electron ◽  
Plasma Interactions ◽  
Laser Plasma Interactions ◽  
Electron Production ◽  
Scale Length

scholarly journals Mini-Review of Intra-Stark X-ray Spectroscopy of Relativistic Laser–Plasma Interactions

Atoms ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 45 ◽  
Author(s):  
Elisabeth Dalimier ◽  
Tatiana A. Pikuz ◽  
Paulo Angelo
Keyword(s):  
Spectral Line ◽  
Laser Plasma ◽  
Acoustic Waves ◽  
Critical Density ◽  
Langmuir Wave ◽  
Intense Laser ◽  
Plasma Interactions ◽  
X Ray ◽  
Laser Plasma Interactions ◽  
Ion Acoustic

Intra-Stark spectroscopy (ISS) is the spectroscopy within the quasi-static Stark profile of a spectral line. The present paper reviews the X-ray ISS-based studies recently advanced for the diagnostics of the relativistic laser–plasma interactions. By improving experiments performed on the Vulcan Petawatt (PW) laser facility at the Rutherford Appleton Laboratory (RAL), the simultaneous production of the Langmuir waves and of the ion acoustic turbulence at the surface of the relativistic critical density gave the first probe by ISS of the parametric decay instability (PDI) predicted by PIC simulations. The reliable reproducibility of the experimental signatures of PDI—i.e., the Langmuir-wave-induced dips—allowed measurements of the fields of the Langmuir and ion acoustic waves. The parallel theoretical study based on a rigorous condition of the dynamic resonance depending on the relative values of the ion acoustic and the Langmuir fields could explain the disappearance of the Langmuir dips as the Langmuir wave field increases. The ISS used for the diagnostic of the PDI process in relativistic laser–plasma interactions has reinforced the reliability of the spectral line shape while allowing for all broadening mechanisms. The results can be used for a better understanding of intense laser–plasma interactions and for laboratory modelling of physical processes in astrophysical objects.

scholarly journals Review on spontaneous magnetic fields in laser-produced plasmas: Phenomena and measurements

1991 ◽  
Vol 9 (4) ◽  
pp. 841-862 ◽  
Author(s):  
J. A. Stamper
Keyword(s):  
Magnetic Fields ◽  
Laser Plasma ◽  
Inertial Confinement Fusion ◽  
Small Diameter ◽  
Spectral Lines ◽  
Optical Methods ◽  
Focal Region ◽  
Inertial Confinement ◽  
Plasma Interactions ◽  
Laser Plasma Interactions

Large (megagauss) “spontaneous” magnetic fields are produced by laser–plasma interactions when a short, powerful laser pulse is focused to a small diameter onto a solid target. The relevance of these magnetic fields to inertial confinement fusion applications depends on the numerous ways in which they can affect laser–plasma interactions and the resulting plasma. Theoretical studies have dealt with a variety (thermal, radiative, and dynamo) of generation mechanisms and with the associated transport and instability phenomena. The fields, originally observed with small induction probes placed near the target, have been studied in the focal region by optical methods. These optical diagnostics have used Faraday rotation of a probing laser beam and Zeeman profiles of emitted spectral lines.

scholarly journals The effects of ASE contrast and beams mutual alignment on the γ-ray yield in laser-plasma interactions with artificial prepulse

2020 ◽  
Vol 1692 ◽  
pp. 012023
Author(s):  
S A Shulyapov ◽  
I N Tsymbalov ◽  
K A Ivanov ◽  
G A Gospodinov ◽  
R V Volkov ◽  
...  
Keyword(s):  
Laser Plasma ◽  
Plasma Interactions ◽  
Laser Plasma Interactions ◽  
Γ Ray

scholarly journals Momentum distribution of accelerated ions in ultra-intense laser–plasma interactions via neutron spectroscopy

2003 ◽  
Vol 10 (9) ◽  
pp. 3712-3716 ◽  
Author(s):  
H. Habara ◽  
R. Kodama ◽  
Y. Sentoku ◽  
N. Izumi ◽  
Y. Kitagawa ◽  
...  
Keyword(s):  
Momentum Distribution ◽  
Laser Plasma ◽  
Intense Laser ◽  
Neutron Spectroscopy ◽  
Plasma Interactions ◽  
Laser Plasma Interactions

Laser–plasma interactions in 532 nm ablation of Si

2000 ◽  
Vol 88 (2) ◽  
pp. 1184-1186 ◽  
Author(s):  
Gyoowan Han ◽  
P. Terrence Murray
Keyword(s):  
Laser Plasma ◽  
Plasma Interactions ◽  
Laser Plasma Interactions ◽  
532 Nm
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