Effect of a prepulse on the efficiency of gamma-ray generation by a relativistic laser pulse obliquely incident on a planar target

2017 ◽  
Vol 47 (3) ◽  
pp. 206-211 ◽  
Author(s):  
D A Serebryakov ◽  
E N Nerush
Keyword(s):  
Laser Pulse ◽  
Gamma Ray ◽  
Obliquely Incident ◽  
Planar Target

scholarly journals Studies of ablated plasma and shocks produced in a planar target by a sub-nanosecond laser pulse of intensity relevant to shock ignition

2015 ◽  
Vol 33 (3) ◽  
pp. 561-575 ◽  
Author(s):  
J. Badziak ◽  
L. Antonelli ◽  
F. Baffigi ◽  
D. Batani ◽  
T. Chodukowski ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Laser Intensity ◽  
Laser System ◽  
Energy Conversion Efficiency ◽  
Hot Electrons ◽  
Plastic Layer ◽  
Maximum Pressure ◽  
Nanosecond Laser Pulse ◽  
Nanosecond Laser ◽  
Planar Target

AbstractThe effect of laser intensity on characteristics of the plasma ablated from a low-Z (CH) planar target irradiated by a 250 ps, 0.438 µm laser pulse with the intensity of up to 1016 W/cm2 as well as on parameters of the laser-driven shock generated in the target for various scale-lengths of preformed plasma was investigated at the kilojoule Prague Asterix Laser System (PALS) laser facility. Characteristics of the plasma were measured with the use of 3-frame interferometry, ion diagnostics, an X-ray spectrometer, and Kα imaging. Parameters of the shock generated in a Cl doped CH target by the intense 3ω laser pulse were inferred by numerical hydrodynamic simulations from the measurements of craters produced by the shock in the massive Cu target behind the CH layer. It was found that the pressure of the shock generated in the plastic layer is relatively weakly influenced by the preplasma (the pressure drop due to the preplasma presence is ~10–20%) and at the pulse intensity of ~1016 W/cm2 the maximum pressure reaches ~80–90 Mbar. However, an increase in pressure of the shock with the laser intensity is slower than predicted by theory for a planar shock and the maximum pressure achieved in the experiment is by a factor of ~2 lower than predicted by the theory. Both at the preplasma absence and presence, the laser-to-hot electrons energy conversion efficiency is small, ~1% or below, and the influence of hot electrons on the generated shock is expected to be weak.

Fast Diamond Photoconductors

1993 ◽  
Vol 302 ◽  
Author(s):  
T. Pochet ◽  
B. Brullot ◽  
R. Galli ◽  
C. Rubbelynck
Keyword(s):  
Light Intensity ◽  
Laser Pulse ◽  
Gamma Ray ◽  
Applied Bias ◽  
Preliminary Results ◽  
Detector Sensitivity

ABSTRACTPreliminary results on the response of type Ib and IIa diamond photodetectors to fast laser pulse exposures at 265 and 530 nm are presented. The influence of the applied bias, the laser wavelengths and the light intensity on the detector sensitivity is studied. Also, recent measurements with 1.25 MeV gamma ray pulses are reported.

scholarly journals Gamma-ray flash generation in irradiating a thin foil target by a single-cycle tightly focused extreme power laser pulse

2021 ◽  
Vol 104 (1) ◽  
Author(s):  
P. Hadjisolomou ◽  
T. M. Jeong ◽  
P. Valenta ◽  
G. Korn ◽  
S. V. Bulanov
Keyword(s):  
Laser Pulse ◽  
Gamma Ray ◽  
Thin Foil ◽  
Single Cycle ◽  
Power Laser ◽  
Foil Target

scholarly journals Ion acceleration via ‘nonlinear vacuum heating’ by the laser pulse obliquely incident on a thin foil target

2015 ◽  
Vol 58 (2) ◽  
pp. 025003 ◽  
Author(s):  
A Yogo ◽  
S V Bulanov ◽  
M Mori ◽  
K Ogura ◽  
T Zh Esirkepov ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Thin Foil ◽  
Ion Acceleration ◽  
Obliquely Incident ◽  
Foil Target ◽  
Vacuum Heating
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