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 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 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

scholarly journals The High Energy Density Scientific Instrument at the European XFEL

2021 ◽  
Vol 28 (5) ◽  
Author(s):  
Ulf Zastrau ◽  
Karen Appel ◽  
Carsten Baehtz ◽  
Oliver Baehr ◽  
Lewis Batchelor ◽  
...  
Keyword(s):  
Energy Density ◽  
Laser Pulses ◽  
High Energy ◽  
High Energy Density ◽  
Intense Laser ◽  
Scientific Instrument ◽  
X Ray ◽  
Intense Laser Pulses ◽  
Pulsed Magnets ◽  
Beam Parameters

The European XFEL delivers up to 27000 intense (>1012 photons) pulses per second, of ultrashort (≤50 fs) and transversely coherent X-ray radiation, at a maximum repetition rate of 4.5 MHz. Its unique X-ray beam parameters enable groundbreaking experiments in matter at extreme conditions at the High Energy Density (HED) scientific instrument. The performance of the HED instrument during its first two years of operation, its scientific remit, as well as ongoing installations towards full operation are presented. Scientific goals of HED include the investigation of extreme states of matter created by intense laser pulses, diamond anvil cells, or pulsed magnets, and ultrafast X-ray methods that allow their diagnosis using self-amplified spontaneous emission between 5 and 25 keV, coupled with X-ray monochromators and optional seeded beam operation. The HED instrument provides two target chambers, X-ray spectrometers for emission and scattering, X-ray detectors, and a timing tool to correct for residual timing jitter between laser and X-ray pulses.

scholarly journals Nonlinear Thomson backscattering of intense laser pulses by electrons trapped in plasma-vacuum boundary

2009 ◽  
Vol 27 (3) ◽  
pp. 365-370 ◽  
Author(s):  
Jiansheng Liu ◽  
Changquan Xia ◽  
Li Liu ◽  
Ruxin Li ◽  
Zhizhan Xu
Keyword(s):  
Laser Field ◽  
Second Harmonic ◽  
Laser Pulses ◽  
Intense Laser ◽  
Intense Laser Pulse ◽  
Spectral Filtering ◽  
Plasma Surface ◽  
X Ray ◽  
Intense Laser Pulses ◽  
Relativistic Factor

AbstractWe present the idea of intensified attosecond X-ray generation based on nonlinear Thomson backscattering of an intense laser pulse by electrons trapped in plasma-vacuum boundary. Two frequency up-conversions due to the relativistic Doppler effect and longitudinal γ-spike effect are analyzed, respectively, where γ is the relativistic factor of the plasma surface. Relativistic resonance heating conditions should be used as a criterion for the experimental design to obtain efficient high-order harmonics and energetic electrons' generation at relatively low laser intensities. Shaping the laser field by proposing a detuned second-harmonic can generate a single attosecond pulse without spectral filtering.

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