scholarly journals Numerical Simulations of Laser-Induced Shock Experiments on Graphite

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7079
Author(s):  
Alberto Morena ◽  
Lorenzo Peroni
Keyword(s):  
Numerical Approach ◽  
Heavy Ion ◽  
High Energy ◽  
Intense Laser ◽  
Particle Accelerators ◽  
Step Procedure ◽  
Energy Laser ◽  
High Energy Laser ◽  
Definition Of ◽  
The Impact

The development of particle accelerators with ever increasing energies is raising the standards of the structures which could interact with the particle beams. These structures could be subjected to strong shockwaves in accidental scenarios. In order to test materials in such conditions, one of the most promising techniques is the impact with high-power lasers. In view of the setting up of future experimental campaigns within the Petawatt High-Energy Laser for Heavy Ion Experiments (PHELIX), the present work aims at the development of a numerical approach for the simulation of graphite impacted by laser beams. In particular, the focus is on the spallation damage caused by shockwave reflection: a sufficiently intense laser beam could ablate the matter until plasma conditions, hence producing a shockwave which could travel inside the material and reach a free surface. A numerical model to properly describe the spall fragmentation of graphite has been calibrated on the basis of literature-available experimental data. The numerical approach is a ‘two-step’ procedure: the first step is the definition of the laser–matter interaction and the second one concerns the description of the shockwave evolution into matter. The simulations satisfactorily reproduce the dynamic response of graphite impacted by two different laser sources with various intensities, despite the difficulties of characterising a phenomenon which is extremely fast and chaotic.

scholarly journals Evaluation of the Weighted Mean X-ray Energy for an Imaging System Via Propagation-Based Phase-Contrast Imaging

2020 ◽  
Vol 6 (7) ◽  
pp. 63
Author(s):  
Maria Seifert ◽  
Mareike Weule ◽  
Silvia Cipiccia ◽  
Silja Flenner ◽  
Johannes Hagemann ◽  
...  
Keyword(s):  
Phase Contrast ◽  
Heavy Ion ◽  
High Energy ◽  
Phase Contrast Imaging ◽  
Single Shot ◽  
Contrast Imaging ◽  
Weighted Mean ◽  
X Ray ◽  
Energy Laser ◽  
High Energy Laser

For imaging events of extremely short duration, like shock waves or explosions, it is necessary to be able to image the object with a single-shot exposure. A suitable setup is given by a laser-induced X-ray source such as the one that can be found at GSI (Helmholtzzentrum für Schwerionenforschung GmbH) in Darmstadt (Society for Heavy Ion Research), Germany. There, it is possible to direct a pulse from the high-energy laser Petawatt High Energy Laser for Heavy Ion eXperiments (PHELIX) on a tungsten wire to generate a picosecond polychromatic X-ray pulse, called backlighter. For grating-based single-shot phase-contrast imaging of shock waves or exploding wires, it is important to know the weighted mean energy of the X-ray spectrum for choosing a suitable setup. In propagation-based phase-contrast imaging the knowledge of the weighted mean energy is necessary to be able to reconstruct quantitative phase images of unknown objects. Hence, we developed a method to evaluate the weighted mean energy of the X-ray backlighter spectrum using propagation-based phase-contrast images. In a first step wave-field simulations are performed to verify the results. Furthermore, our evaluation is cross-checked with monochromatic synchrotron measurements with known energy at Diamond Light Source (DLS, Didcot, UK) for proof of concepts.

PHELIX: a petawatt high-energy laser for heavy ion experiments

2001 ◽  
Author(s):  
M. Roth ◽  
Bruno Becker-de Mos ◽  
R. Bock ◽  
Stefan Borneis ◽  
Herbert Brandt ◽  
...  
Keyword(s):  
Heavy Ion ◽  
High Energy ◽  
Heavy Ion Experiments ◽  
Energy Laser ◽  
High Energy Laser

scholarly journals Apparatus to control and visualize the impact of a high-energy laser pulse on a liquid target

2017 ◽  
Vol 88 (9) ◽  
pp. 095102 ◽  
Author(s):  
Alexander L. Klein ◽  
Detlef Lohse ◽  
Michel Versluis ◽  
Hanneke Gelderblom
Keyword(s):  
Laser Pulse ◽  
High Energy ◽  
Energy Laser ◽  
High Energy Laser ◽  
The Impact

PHELK - A Petawatt High-Energy Laser for Heavy-Ion EXperiments

1999 ◽  
Author(s):  
R. Bock ◽  
S. Borneis ◽  
Ch. Bruske ◽  
J. Caird ◽  
D. Habs ◽  
...  
Keyword(s):  
Heavy Ion ◽  
High Energy ◽  
Heavy Ion Experiments ◽  
Energy Laser ◽  
High Energy Laser

scholarly journals Enhancement of the Load Capacity of High-Energy Laser Monocrystalline Silicon Reflector Based on the Selection of Surface Lattice Defects

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4172
Author(s):  
Gang Zhou ◽  
Ye Tian ◽  
Shuai Xue ◽  
Guangqi Zhou ◽  
Ci Song ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ion Beam ◽  
High Energy ◽  
Vacancy Defect ◽  
Monocrystalline Silicon ◽  
Lattice Defects ◽  
Intense Laser ◽  
Manufacturing Defects ◽  
Energy Laser ◽  
High Energy Laser

Various defects during the manufacture of a high-energy laser monocrystalline silicon reflector will increase the energy absorption rate of the substrate and worsen the optical properties. Micron-scale or larger manufacturing defects have been inhibited by mechanism study and improvement in technology, but the substrate performance still fails to satisfy the application demand. We focus on the changes in the optical properties affected by nanoscale and Angstrom lattice defects on the surface of monocrystalline silicon and acquire the expected high reflectivity and low absorptivity through deterministic control of its defect state. Based on the first principles, the band structures and optical properties of two typical defect models of monocrystalline silicon—namely, atomic vacancy and lattice dislocation—were analyzed by molecular dynamics simulations. The results showed that the reflectivity of the vacancy defect was higher than that of the dislocation defect, and elevating the proportion of the vacancy defect could improve the performance of the monocrystalline silicon in infrared (IR) band. To verify the results of simulations, the combined Ion Beam Figuring (IBF) and Chemical Mechanical Polishing (CMP) technologies were applied to introduce the vacancy defect and reduce the thickness of defect layer. After the process, the reflectivity of the monocrystalline silicon element increased by 5% in the visible light band and by 12% in the IR band. Finally, in the photothermal absorption test at 1064 nm, the photothermal absorption of the element was reduced by 80.5%. Intense laser usability on the monocrystalline silicon surface was achieved, and the effectiveness and feasibility of deterministic regulation of optical properties were verified. This concept will be widely applied in future high-energy laser system and X-ray reflectors.

scholarly journals Interaction of annular-focused laser beams with solid targets

2015 ◽  
Vol 33 (3) ◽  
pp. 541-550 ◽  
Author(s):  
N.E. Andreev ◽  
M.E. Povarnitsyn ◽  
M.E. Veysman ◽  
A.YA. Faenov ◽  
P.R. Levashov ◽  
...  
Keyword(s):  
Laser Energy ◽  
Laser Pulses ◽  
Heavy Ion ◽  
High Energy ◽  
Weakly Coupled ◽  
Wide Range ◽  
Energy Laser ◽  
High Energy Laser ◽  
Hydrodynamic Code ◽  
Two Temperature

AbstractThe two-temperature, 2D hydrodynamic code Hydro–ELectro–IOnization–2–Dimensional (HELIO2D), which takes into account self-consistently the laser energy absorption in a target, ionization, heating, and expansion of the created plasma is elaborated. The wide-range two-temperature equation of state is developed and used to model the metal target dynamics from room temperature to the conditions of weakly coupled plasma. The simulation results are compared and demonstrated a good agreement with experimental data on the Mg target being heated by laser pulses of the nanosecond high-energy laser for heavy ion experiments (NHELIX) at Gesellschaft fur Schwerionenforschung. The importance of using realistic models of matter properties is demonstrated.

Alpha-Lamp Integration (ALI) program progressing toward integrated High Energy Laser (HEL) test

1997 ◽  
Author(s):  
David Loomis ◽  
Charles Nefzger ◽  
Ben Platt ◽  
David Loomis ◽  
Charles Nefzger ◽  
...  
Keyword(s):  
High Energy ◽  
Energy Laser ◽  
High Energy Laser

Development of High-Energy Laser for FIREX Program

2005 ◽  
Vol 33 (Supplement) ◽  
pp. 55-56
Author(s):  
N. Miyanaga ◽  
H. Azechi ◽  
K.A. Tanaka ◽  
T. Jitsuno ◽  
H. Shiraga ◽  
...  
Keyword(s):  
High Energy ◽  
Energy Laser ◽  
High Energy Laser

Structural transformations of carbon black by high-energy laser and electron irradiation

2015 ◽  
Vol 10 (9-10) ◽  
pp. 696-700 ◽  
Author(s):  
O. V. Ivashchenko ◽  
M. V. Trenikhin ◽  
Yu. G. Kryazhev ◽  
B. P. Tolochko ◽  
V. S. Eliseev ◽  
...  
Keyword(s):  
Carbon Black ◽  
Electron Irradiation ◽  
High Energy ◽  
Structural Transformations ◽  
Energy Laser ◽  
High Energy Laser
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