A5072029357- Laser-Plasma Interactions and Diagnostics
- Reservoir Engineering and Simulation Methods
- Gamma-ray bursts and supernovae
- Laser-induced spectroscopy and plasma
- Flow Measurement and Analysis
- Magnetic confinement fusion research
- Oil and Gas Production Techniques
- Fluid Dynamics and Mixing
- Hydraulic Fracturing and Reservoir Analysis
- Methane Hydrates and Related Phenomena
- Antenna Design and Analysis
- Stellar, planetary, and galactic studies
- Laser-Matter Interactions and Applications
- Italian Fascism and Post-war Society
- Particle accelerators and beam dynamics
- High-pressure geophysics and materials
- Astro and Planetary Science
- Energy Harvesting in Wireless Networks
- Adhesion, Friction, and Surface Interactions
- Historical and Environmental Studies
- Pulsars and Gravitational Waves Research
- Drilling and Well Engineering
- Solar and Space Plasma Dynamics
- High-Energy Particle Collisions Research
- Atomic and Molecular Physics
Schlumberger (British Virgin Islands)
2014-2020
Instituto Superior Técnico
2004-2010
We investigate the long-time evolution of magnetic fields generated by two-stream instability at ultra- and subrelativistic astrophysical collisionless shocks. Based on three-dimensional particle-in-cell (PIC) simulation results, we introduce a two-dimensional toy model interacting current filaments. Within framework this model, demonstrate that field correlation scale in region far downstream shock grows nearly as light crossing time, λ(t) ~ ct, thus making diffusive dissipation...
We consider how an unmagnetized plasma responds to incoming flux of energetic electrons. assume a return current is present and allow for the electrons have different transverse temperature than current. To analyze this configuration we nonrelativistic theory current-filamentation or Weibel instability rigorously current-neutral nonseparable distribution functions, f(0)(p(x), p(y), p(z)) not equal f(x)(p(x))f(y)(p(y))f(z)(p(z)). find that such functions lead lower growth rates because...
Abstract During well start-up operations for multi-stage hydraulically fractured horizontal wells, coiled tubing (CT) is required to perform frac-plug drill outs (FPDO) clean out the well, remove proppant left in section after fracturing treatment and plug debris before it put on production. Previous studies have shown that during CT FPDO, monitoring fluid return rates critical preserve productive fractures, as an excessive annular velocity carries solids of will cause flowback fractures....
Abstract Unconventional resource development has become the most widespread form of energy production in US and gained increased interest Kingdom Saudi Arabia (KSA). Reliable robust multiphase flowmeters (MPFMs) using a combination Venturi multi-energy gamma-ray absorption represent solution that can replace bulky costly separators while providing accurate flow rate monitoring for high gas production. A accuracy is required, particularly where, exploitation mineral resources, landowners...
The origin of magnetic fields in the universe remains an outstanding problem cosmology. We propose that these are produced by shocks during large-scale structure formation. discuss mechanism field generation via counter-streaming (Weibel) instability. also show Weibel-generated long-lived and weakly coupled to dissipation. Subsequent amplification intra-cluster turbulence may take place, thus maintaining energy density close equipartition.
The dynamics of two counter-streaming electron-positron-ion unmagnetized plasma shells with zero net charge is analyzed in the context magnetic field generation GRB internal shocks due to Weibel instability. effects large thermal motion particles, arbitrary mixture species and space are taken into account. We show that, although slow down instability, baryon loading leads a non-negligible growth rate even for temperatures different shell velocities, thus guaranteeing robustness occurrence...
The results from 2.5-dimensional particle-in-cell simulations for the interaction of a picosecond-long ignition laser pulse with plasma pellet 50-μm diameter and 40 critical density are presented. high-density is surrounded by an underdense corona isolated vacuum region simulation box boundary. shown to filament create channels on laser-plasma interface. increase absorption efficiency help generate energetic electron distribution large angular spread. combined forward-going electrons induced...
Abstract Multiphase flowmeters (MPFMs) have been used since the early 1990's in oil and gas industry gained acceptance many environments. They considered primary metering option for a wide range of applications - from heavy to wet gas. The combination operational benefits, measurement robustness, demonstrable accuracy, auditability has improved their status new, unproven technology that premium mainstream option. With more than decade experience acquired using venturi gamma-ray multiphase...
The stability of general electron distribution functions to purely electromagnetic modes is considered, so as generalize the well-known analysis for bi-Gaussian functions. expansion an arbitrary nonrelativistic function into a modified version Hermite–Gaussian yields dispersion relation in compact form that depends on coefficients well plasma and its derivatives. enter depend only zeroth second moments from direction high temperature. solved analytically frequency low anisotropy (kinetic)...
Abstract Relativistic collisional effects on the filamentation instability are analytically and numerically investigated by comparing collisionless scenarios for a fast ignition (FI) configuration. The theoretical kinetic model, including warm species space charge effects, predicts preferential formation of larger filaments inhibition/enhancement when collisions accounted for. These qualitatively quantitatively confirmed 1D 2D particle-in-cell (PIC) simulations, also providing physical...
Abstract With 20 years of operations, multiphase flowmeters (MPFMs) using a combination venturi and multi-energy gamma-ray absorption have gained acceptance in the oil gas industry by demonstrating reliable measurement operational robustness. Nonetheless, some challenging operating scenarios are encountered such as significant water salinity changes wet-gas flows rapid detection small quantities during production. Although MPFMs not affected changes, inaccurate flow rates can be calculated...
With 20 years of operations, multiphase flowmeters (MPFMs) using a combination venturi and multi-energy gamma-ray absorption have gained acceptance in the oil gas industry by demonstrating reliable measurement operational robustness. Nonetheless, some challenging operating scenarios are encountered such as significant water salinity changes wet-gas flows rapid detection small quantities during production. Although MPFMs not affected changes, inaccurate flow rates can be calculated when...