scholarly journals Laboratory radiative accretion shocks on GEKKO XII laser facility for POLAR project

2018 ◽  
Vol 6 ◽  
Author(s):  
L. Van Box Som ◽  
É. Falize ◽  
M. Koenig ◽  
Y. Sakawa ◽  
B. Albertazzi ◽  
...  
Keyword(s):  
Experimental Data ◽  
Laser Energy ◽  
High Energy ◽  
Experimental Results ◽  
Material Structure ◽  
Reverse Shock ◽  
Before And After ◽  
Laser Facility ◽  
Post Shock ◽  
Accretion Shocks

A new target design is presented to model high-energy radiative accretion shocks in polars. In this paper, we present the experimental results obtained on the GEKKO XII laser facility for the POLAR project. The experimental results are compared with 2D FCI2 simulations to characterize the dynamics and the structure of plasma flow before and after the collision. The good agreement between simulations and experimental data confirms the formation of a reverse shock where cooling losses start modifying the post-shock region. With the multi-material structure of the target, a hydrodynamic collimation is exhibited and a radiative structure coupled with the reverse shock is highlighted in both experimental data and simulations. The flexibility of the laser energy produced on GEKKO XII allowed us to produce high-velocity flows and study new and interesting radiation hydrodynamic regimes between those obtained on the LULI2000 and Orion laser facilities.

Systematic study of rapidity dispersion parameter in high energy nucleus–nucleus interactions

2014 ◽  
Vol 23 (03) ◽  
pp. 1450012 ◽  
Author(s):  
Swarnapratim Bhattacharyya ◽  
Maria Haiduc ◽  
Alina Tania Neagu ◽  
Elena Firu
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Systematic Study ◽  
Nuclear Emulsion ◽  
Quantitative Measure ◽  
High Energy ◽  
Average Multiplicity ◽  
Experimental Results ◽  
Dispersion Parameter ◽  
Parameter Values

A systematic study of rapidity dispersion parameter as a quantitative measure of clustering of particles has been carried out in the interactions of 16 O , 28 Si and 32 S projectiles at 4.5 A GeV/c with heavy ( AgBr ) and light (CNO) groups of targets present in the nuclear emulsion. For all the interactions, the total ensemble of events has been divided into four overlapping multiplicity classes depending on the number of shower particles. For all the interactions and for each multiplicity class, the rapidity dispersion parameter values indicate the occurrence of clusterization during the multiparticle production at Dubna energy. The measured rapidity dispersion parameter values are found to decrease with the increase of average multiplicity for all the interactions. The dependence of rapidity dispersion parameter on the average multiplicity can be successfully described by a relation D(η) = a + b〈ns〉 + c〈ns〉2. The experimental results have been compared with the results obtained from the analysis of Monte Carlo simulated (MC-RAND) events. MC-RAND events show weaker clusterization among the pions in comparison to the experimental data.

scholarly journals Shower and Slow Particle Productions in Nucleus-Nucleus Collisions at High Energy

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
S. Fakhraddin ◽  
Magda A. Rahim ◽  
Hamdy M. M. Zayd
Keyword(s):  
Experimental Data ◽  
Thermal Model ◽  
Theoretical Calculations ◽  
High Energy ◽  
Experimental Results ◽  
Angular Distributions ◽  
Target Groups ◽  
Slow Particle ◽  
Multiplicity Distributions

The multiplicity distributions of shower, grey, and black particles produced in interactions of4He,12C,16O,22Ne, and28Si with emulsion (Em) at 4.1–4.5 A GeV/c beam energies, and their dependence on target groups (H, CNO, and AgBr) is presented and has been reproduced by multisource thermal model. The multiplicity and the angular distributions of the three types of particles have been investigated. The experimental results are compared with the corresponding ones from the model. We found that the experimental data agrees with theoretical calculations using multisource thermal model.

scholarly journals Characterization of laser-driven Radiative shock of Astrophysical interests

2015 ◽  
Vol 11 (A29A) ◽  
Author(s):  
U. Chaulagain ◽  
C. Stehlé ◽  
J. Larour ◽  
M. Kozlová ◽  
F. Suzuki-Vidal ◽  
...  
Keyword(s):  
Shock Waves ◽  
Shock Structure ◽  
Experimental Results ◽  
Radiative Shock ◽  
X Ray ◽  
Laser Facility ◽  
Post Shock

AbstractWe highlight the recent experimental results on laser-driven radiative shock waves of astrophysical interests using kJ PALS laser facility. The generated shock is probed instantaneously by X-ray laser (λ = 21.2 nm) showing an unambiguous shock structure that includes both the post-shock and the precursor.

scholarly journals Shock Hugoniot Data for Water up to 5 Mbar Obtained with Quartz Standard at High-Energy Laser Facilities

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
D. Mancelli ◽  
I. Errea ◽  
A. Tentori ◽  
O. Turianska ◽  
H. Larreur ◽  
...  
Keyword(s):  
Equations Of State ◽  
Heavy Ion ◽  
High Energy ◽  
Experimental Results ◽  
Diagnostic Tools ◽  
Standard Material ◽  
Single Beam ◽  
Laser Facility ◽  
Shock Hugoniot ◽  
Energy Laser

In this work, we present experimental results on the behavior of liquid water at megabar pressure. The experiment was performed using the HIPER (High-Intensity Plasma Experimental Research) laser facility, a uniaxial irradiation chamber of GEKKO XII (GXII) at the Institute of Laser Engineering (ILE), and the PHELIX at GSI (GSI Helmholtz Centre for Heavy Ion Research), a single-beam high-power laser facility, to launch a planar shock into solid multilayered water samples. Equation-of-state data of water H 2 O are obtained in the pressure range 0.50–4.6 Mbar by tuning the laser-drive parameters. The Hugoniot parameters (pressure, density, etc.) and the shock temperature were simultaneously determined by using VISAR and SOP as diagnostic tools and quartz as the standard material for impedance mismatch experiments. Finally, our experimental results are compared with hydrodynamic simulations tested with different equations of state, showing good compatibility with tabulated SESAME tables for water.

Studies of Asymmetric particle Production in Different Multiplicity Zone in Azimuthal Space in High Energy Nucleus-Nucleus Interactions

2020 ◽  
Author(s):  
Swarnapratim Bhattacharyya
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Particle Production ◽  
High Energy ◽  
Experimental Results ◽  
Dynamical Fluctuations ◽  
Experimental Findings

Studies of asymmetric particle production and investigation of dynamical fluctuations in different multiplicity zone in azimuthal space are performed for <sup>16</sup>O-AgBr, <sup>22</sup>Ne-AgBr, <sup>28</sup>Si-AgBr and <sup>32</sup>S-AgBr interactions at (4.1-4.5) AGeV/c. Evidence of strong dynamical fluctuations is observed for the experimental data. Comparisons of the experimental results with the results of Monte Carlo simulated events (MC-RAND) and the results obtained from the analysis of AMPT model also strengthen the experimental findings.

ANGULAR DISTRIBUTIONS OF TARGET BLACK FRAGMENTS IN NUCLEUS–NUCLEUS COLLISIONS AT HIGH ENERGY

2003 ◽  
Vol 12 (05) ◽  
pp. 713-723 ◽  
Author(s):  
FU-HU LIU ◽  
NABIL N. ABD ALLAH ◽  
DONG-HAI ZHANG ◽  
MAI-YING DUAN
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
High Energy ◽  
Ideal Gas ◽  
Experimental Results ◽  
Angular Distributions ◽  
Ideal Gas Model

The experimental results of space, azimuthal, and projected angular distributions of target black fragments produced in silicon-emulsion collisions at 4.5A GeV/c (the Dubna energy) are reported. A multi-source ideal gas model is suggested to describe the experimental angular distributions. The Monte Carlo calculated results are in agreement with the experimental data.

scholarly journals About healing of porosity in metal under high energy electromagnetic field

2020 ◽  
pp. 116-131
Author(s):  
Константин Владимирович Кукуджанов ◽  
Александр Викторович Ченцов
Keyword(s):  
Experimental Data ◽  
Electromagnetic Field ◽  
Plastic Strain ◽  
Experimental Methods ◽  
High Energy ◽  
Short Pulses ◽  
Before And After

В статье приведены результаты исследования по обработке образцов из цинка короткими импульсами высокоэнергетического электромагнитного поля. Целью работы являлась исследование возможности залечивания микропор и микротрещин внутри материала. Приводится описание используемого оборудования и методики экспериментов. Проведен анализ полученных экспериментальных данных. На основе исследования микроструктуры металла до и после воздействия полем подтверждается предположение о том, что в процессе воздействия высокоэнергетическим полем в металле может происходить уменьшение его пористости и как следствие значительное увеличение предельной пластической деформации до разрушения. Показано, что уменьшение пористости не является результатом рекристаллизации, которая при исследуемом воздействии практически не происходит. The article presents the results of a study of treatment short pulses of a high-energy electromagnetic field on samples from zinc. The aim of the work was to study the possibility of healing micropores and microcracks inside the material. The description of the used equipment and experimental methods is given. The obtained experimental data are analyzed. Based on the study of the microstructure of the metal before and after exposure to the field, The assumption is confirmed that under the considered treatment in zinc, there may be a decrease in the damage(porosity) of the material and, as a result, a significant increase in the limit plastic strain before fracture. It is shown that the decrease in porosity is not the result of recrystallization, which practically does not occur under the studied influence.

Study of potential curves by UHF type methods. CH4 molecule and its dissociation products

1986 ◽  
Vol 51 (4) ◽  
pp. 731-737
Author(s):  
Viliam Klimo ◽  
Jozef Tiňo
Keyword(s):  
Experimental Data ◽  
Quantum Chemistry ◽  
High Energy ◽  
Basis Set ◽  
Electronic Correlation ◽  
Exact Methods ◽  
Energy Parameters ◽  
Bond Functions ◽  
The Individual ◽  
Potential Curves

Geometry and energy parameters of the individual dissociation intermediate steps of CH4 molecule, parameters of the barrier to linearity and singlet-triplet separation of the CH2 molecule have been calculated by means of the UMP method in the minimum basis set augmented with the bond functions. The results agree well with experimental data except for the geometry of CH2(1A1) and relatively high energy values of CH(2II) and CH2(1A1) where the existence of two UHF solutions indicates a necessity of description of the electronic correlation by more exact methods of quantum chemistry.

Convective Losses From Cavity Solar Receivers—Comparisons Between Analytical Predictions and Experimental Results

1983 ◽  
Vol 105 (1) ◽  
pp. 29-33 ◽  
Author(s):  
A. M. Clausing
Keyword(s):  
Experimental Data ◽  
Experimental Evidence ◽  
Analytical Model ◽  
Excellent Agreement ◽  
Experimental Results ◽  
Simple Analytical Model ◽  
Refined Model ◽  
Wall Area

Cavity solar receivers are generally believed to have higher thermal efficiencies than external receivers due to reduced losses. A simple analytical model was presented by the author which indicated that the ability to heat the air inside the cavity often controls the convective loss from cavity receivers. Thus, if the receiver contains a large amount of inactive hot wall area, it can experience a large convective loss. Excellent experimental data from a variety of cavity configurations and orientations have recently become available. These data provided a means of testing and refining the analytical model. In this manuscript, a brief description of the refined model is presented. Emphasis is placed on using available experimental evidence to substantiate the hypothesized mechanisms and assumptions. Detailed comparisons are given between analytical predictions and experimental results. Excellent agreement is obtained, and the important mechanisms are more clearly delineated.

A Technique for the Laboratory Determination of Recirculation in Single Needle Dialysis

1993 ◽  
Vol 16 (2) ◽  
pp. 63-70 ◽  
Author(s):  
N.A. Hoenich ◽  
P.T. Smirthwaite ◽  
C. Woffindin ◽  
P. Lancaster ◽  
T.H. Frost ◽  
...  
Keyword(s):  
Experimental Data ◽  
Flow Rate ◽  
Experimental Results ◽  
New Technique ◽  
Treatment Efficiency ◽  
Single Lumen ◽  
Theoretical Predictions ◽  
Lumen Catheter ◽  
A New Technique

Recirculation is an important factor in single needle dialysis and, if high, can compromise treatment efficiency. To provide information regarding recirculation characteristics of access devices used in single needle dialysis, we have developed a new technique to characterise recirculation and have used this to measure the recirculation of a Terumo 15G fistula needle and a VasCath SC2300 single lumen catheter. The experimentally obtained results agreed well with those established clinically (8.5 ± 2.4% and 18.4 ± 3.4%). The experimental results have also demonstrated a dependence on access type, pump speeds and fistula flow rate. A comparison of experimental data with theoretical predictions showed that the latter exceeded those measured with the largest contribution being due to the experimental fistula.

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