Soft x-ray emission, angular distribution of hot electrons, and absorption studies of argon clusters in intense laser pulses

2009 ◽  
Vol 16 (4) ◽  
pp. 043301 ◽  
Author(s):  
Yunquan Liu ◽  
Quanli Dong ◽  
Xiaoyu Peng ◽  
Zan Jin ◽  
Jie Zhang
Keyword(s):  
Angular Distribution ◽  
Laser Pulses ◽  
Hot Electrons ◽  
Intense Laser ◽  
X Ray ◽  
Intense Laser Pulses ◽  
Argon Clusters ◽  
Absorption Studies

scholarly journals K-shell x-ray emission enhancement via self-guided propagation of intense laser pulses in Ar clusters

2009 ◽  
Vol 17 (19) ◽  
pp. 16379 ◽  
Author(s):  
Feng Liu ◽  
Li-Ming Chen ◽  
Xiao-Xuan Lin ◽  
Feng Liu ◽  
Jing-Long Ma ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Intense Laser ◽  
X Ray ◽  
Intense Laser Pulses ◽  
Emission Enhancement ◽  
Guided Propagation

scholarly journals Generation and transport of fast electrons inside cone targets irradiated by intense laser pulses

2006 ◽  
Vol 24 (1) ◽  
pp. 5-8 ◽  
Author(s):  
TATSUFUMI NAKAMURA ◽  
HITOSHI SAKAGAMI ◽  
TOMOYUKI JOHZAKI ◽  
HIDEO NAGATOMO ◽  
KUNIOKI MIMA
Keyword(s):  
Laser Pulses ◽  
Transport Processes ◽  
Hot Electrons ◽  
Intense Laser ◽  
Rear Side ◽  
Fast Electrons ◽  
Surface Magnetic Field ◽  
Particle In Cell ◽  
Intense Laser Pulses ◽  
Cone Target

Fast electrons are effectively generated from solid targets of cone-geometry by irradiating intense laser pulses, which is applied to fast ignition scheme. For realizing optimal core heating by those electrons, understanding the characteristics of electrons emitted from cone targets is crucial. In this paper, in order to understand the generation and transport processes of hot electrons inside the cone target, two-dimensional (2D) particle-in-cell (PIC) simulations were carried out. It is shown that hot electrons form current layers which are guided by self-generated surface magnetic field, which results in effective energy transfer from laser pulse to hot electrons. When the hot electrons propagate through the steep density gradient at the cone tip, electrostatic field is induced via Weibel instability. As a result, hot electrons are confined inside and emitted gradually from the target, as an electron beam of long duration. Energy spectrum and temporal profile of hot electrons are also evaluated at the rear side of the target, where the profile of rear side plasma is taken from the fluid code and the result is sent to Fokker-Planck code.

scholarly journals A Mechanism for Inducing Compressive Residual Stresses on a Surface by Laser Peening without Coating

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 816 ◽  
Author(s):  
Yuji Sano ◽  
Koichi Akita ◽  
Tomokazu Sano
Keyword(s):  
Single Pulse ◽  
Laser Pulses ◽  
Mechanical Effect ◽  
Intense Laser ◽  
Laser Peening ◽  
X Ray Diffraction ◽  
X Ray ◽  
Intense Laser Pulses ◽  
Laser Peening Without Coating ◽  
Compressive Residual Stresses

Laser peening without coating (LPwC) involves irradiating materials covered with water with intense laser pulses to induce compressive residual stress (RS) on a surface. This results in favorable effects, such as fatigue enhancement; however, the mechanism underlying formation of the compressive RS is not fully understood. In general, tensile RS is imparted on the surface of the material due to shrinkage after heating by laser irradiation. In this study, we assessed the thermo-mechanical effect of single laser pulse irradiation and introduce a phenomenological model to predict the outcome of LPwC. To validate this model, RS distribution across the laser-irradiated spot was analyzed using X-ray diffraction with synchrotron radiation. In addition, the RS was evaluated across a line and over an area, following irradiation by multiple laser pulses with partial overlapping. Large tensile RSs were found in the spot irradiated by the single pulse; however, compressive RSs appeared around the spot. In addition, the surface RS state shifted to the compressive side due to an increase in overlap between neighboring laser pulses on the line and over the area of irradiation. The compressive RSs around a subsequent laser spot effectively compensated the tensile component on the previous spot by controlling the overlap, which may result in compressive RSs on the surface after LPwC.

scholarly journals Influence of laser incidence angle on hot electrons generated in the interaction of ultrashort intense laser pulses with foil target

2006 ◽  
Vol 55 (11) ◽  
pp. 5899
Author(s):  
Yuan Xiao-Hui ◽  
Li Yu-Tong ◽  
Xu Miao-Hua ◽  
Zheng Zhi-Yuan ◽  
Liang Wen-Xi ◽  
...  
Keyword(s):  
Incidence Angle ◽  
Laser Pulses ◽  
Hot Electrons ◽  
Intense Laser ◽  
Intense Laser Pulses ◽  
Foil Target

Collimation of laser-driven energetic protons in a capillary

2012 ◽  
Vol 78 (4) ◽  
pp. 333-337
Author(s):  
D.-P. CHEN ◽  
Y. YIN ◽  
Z.-Y. GE ◽  
H. XU ◽  
H.-B. ZHUO ◽  
...  
Keyword(s):  
Proton Beam ◽  
Electron Flow ◽  
Laser Pulses ◽  
Hot Electrons ◽  
Beam Divergence ◽  
Intense Laser ◽  
Particle In Cell ◽  
Intense Laser Pulses ◽  
Electric And Magnetic Fields ◽  
Set Up

AbstractEnergetic divergent proton beams can be generated in the interaction of ultra-intense laser pulses with solid-density foil targets via target normal sheath acceleration (TNSA). In this paper, a scheme using a capillary to reduce the proton beam divergence is proposed. By two-dimensional particle-in-cell (PIC) simulations, it is shown that strong transverse electric and magnetic fields rapidly grow at the inner surface of the capillary when the laser-driven hot electrons propagate through the target and into the capillary. The spontaneous magnetic field collimates the electron flow, and the ions dragged from the capillary wall by hot electrons neutralize the negative charge and thus restrain the transverse extension of the sheath field set up by electrons. The proton beam divergence, which is mainly determined by the accelerating sheath field, is therefore reduced by the transverse limitation of the sheath field in the capillary.

scholarly journals Role of the laser wavelength in the X-ray production for clusters under intense laser pulses

2014 ◽  
Vol 488 (13) ◽  
pp. 132021
Author(s):  
C Prigent ◽  
M Comte ◽  
O Gobert ◽  
D Guillaumet ◽  
J Habib ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Laser Wavelength ◽  
Intense Laser ◽  
X Ray ◽  
Intense Laser Pulses
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