A5059484000- Magnetic confinement fusion research
- Laser-Plasma Interactions and Diagnostics
- Particle accelerators and beam dynamics
- Laser-induced spectroscopy and plasma
- Laser Design and Applications
- Ionosphere and magnetosphere dynamics
- Plasma Diagnostics and Applications
- Particle Accelerators and Free-Electron Lasers
- Muon and positron interactions and applications
- Fluid Dynamics and Heat Transfer
- Particle Detector Development and Performance
- Neutrino Physics Research
- Fusion materials and technologies
- Laser-Matter Interactions and Applications
- Fluid Dynamics Simulations and Interactions
- Lattice Boltzmann Simulation Studies
- Superconducting Materials and Applications
- Gas Dynamics and Kinetic Theory
- Computational Fluid Dynamics and Aerodynamics
- Fluid Dynamics and Turbulent Flows
- Astrophysics and Cosmic Phenomena
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Particle Dynamics in Fluid Flows
- High-pressure geophysics and materials
Stony Brook University
2013-2024
Brookhaven National Laboratory
2010-2023
Applied Mathematics (United States)
2010-2022
University of California, San Diego
2022
General Atomics (United States)
2022
Oak Ridge National Laboratory
2022
State University of New York
2013
RIKEN BNL Research Center
2002-2006
New Jersey Institute of Technology
1999-2002
Argonne National Laboratory
2002
Abstract The pre-thermal quench (pre-TQ) dynamics of a pure deuterium ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msub> <mml:mi mathvariant="normal">D</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> </mml:math> ) shattered pellet injection (SPI) into <mml:mn>3</mml:mn> <mml:mstyle scriptlevel="0"/> <mml:mi>MA</mml:mi> / <mml:mn>7</mml:mn> <mml:mi>MJ</mml:mi> JET H-mode plasma is studied via 3D non-linear MHD modelling with the JOREK code....
Plasma-jet-driven magneto-inertial fusion (PJMIF) is the only embodiment of that has unique combination stand-off implosion and high velocity (50 to 150 km/s). It uses inexpensive plasma guns for all formation potential a relatively repetition rate from 1 2 Hz. Its configuration compatible with use thick liquid wall doubles as tritium breeding blanket well coolant extracting heat out reactor. The PJMIF operational parameter-space allows possibility using sufficiently dense target have β. If...
Abstract Laser-driven plasma accelerators provide tabletop sources of relativistic electron bunches and femtosecond x-ray pulses, but usually require petawatt-class solid-state-laser pulses wavelength λ L ~ 1 μ m. Longer- lasers can potentially accelerate higher-quality bunches, since they less power to drive larger wakes in dense plasma. Here, we report on a self-injecting accelerator driven by long-wave-infrared laser: chirped-pulse-amplified CO 2 laser ( ≈ 10 m). Through optical...
Abstract A 3D numerical model for the ablation of pellets and shattered pellet injection fragments in tokamaks plasma disruption mitigation fueling parameter space has been developed based on Lagrangian particle (LP) method Samulyak et al (2018 J. Comput. Phys. 362 1–19). The code implements low magnetic Reynolds number MHD equations, kinetic models electronic heating, a surface model, an equation state that supports multiple ionization states, radiation, grad-B drift ablated material across...
We report initial results of exposing low-Z solid and high-Z liquid targets to 150-ns, 4/spl times/10/sup 12/ proton pulses with spot sizes on the order 1 2 mm. The energy deposition density approached 100 J/g. Diagnostics included fiberoptic strain sensors target high-speed photography targets. This work is part R&D program Neutrino Factory Muon Collider Collaboration.
A magnetohydrodynamic numerical model for hydrogenic pellet ablation in the electrostatic approximation has been developed based on method of front tracking. The main features are explicit tracking interfaces that separate solid from ablated gas and cold, dense weakly ionized cloud highly conducting fusion plasma, a surface model, kinetic electron heat flux an equation state accounting atomic processes cloud. interaction flow with magnetic field including J × B Lorentz force is studied here...
We describe an experiment to form and characterize a section of spherically imploding plasma liner by merging six supersonic jets that are launched newly designed contoured-gap coaxial guns. This is prelude forming fully spherical using many dozens guns, as standoff driver for plasma-jet-driven magneto-inertial fusion. The objectives the six-jet experiments assess evolution scalings Mach number uniformity, which important metrics liners compress magnetized target plasmas fusion conditions....
Detailed numerical studies of the ablation a single neon pellet in plasma disruption mitigation parameter space have been performed. Simulations were carried out using FronTier, hydrodynamic/low magnetic Reynolds number MHD code with explicit tracking material interfaces. FronTier's physics models resolve surface and formation dense, cold cloud ablated material, deposition energy from hot electrons, expansion along field lines, radiation losses. A local thermodynamic equilibrium model based...
Long wavelength infrared laser-driven plasma wakefield accelerators are investigated here in the self-modulated laser acceleration (SM-LWFA) and blowout regimes using 3D particle-in-cell simulations. The simulation results show that SM-LWFA regime, self-injection arises with wave breaking, whereas is not observed under conditions. breaking process regime occurs at a field strength significantly below 1D wave-breaking threshold. This intensifies higher power density suppressed low densities...
The trimming problem for swept volumes — concerning the excision of points ostensibly on boundary that actually lie in volume interior is investigated detail. Building upon several techniques have appeared literature, efficient methods both local and global are developed. These shown to be computationally cost effective when combined with sweep-envelope differential equation algorithm approximate calculation graphical rendering quite general objects sweeps. Examples presented demonstrate...
Spherically symmetric simulations of the implosion plasma liners and compression targets in concept jet driven magnetoinertial fusion have been performed using method front tracking. The cases single deuterium xenon double layer deuterium-xenon compressing various deuterium-tritium investigated, optimized for maximum energy gains, compared with theoretical predictions scaling laws [P. Parks, Phys. Plasmas 15, 062506 (2008)]. In agreement theory, gain was significantly below unity compressed...
3D numerical simulations of the interaction a powerful CO2 laser with hydrogen jets demonstrating role ionization in characteristics induced wakes are presented. Simulations using SPACE, parallel relativistic particle-in-cell code, performed support plasma wakefield accelerator experiments being conducted at Brookhaven National Laboratory (BNL) Accelerator Test Facility (ATF). A novelty SPACE code is its set efficient atomic physics algorithms that compute and recombination rates on grid...
The direct numerical simulation (DNS) method has been used to the study of linear and shock wave propagation in bubbly fluids estimation efficiency cavitation mitigation container Spallation Neutron Source liquid mercury target. DNS for flows is based on front tracking technique developed free surface flows. Our hydrodynamic code FronTier capable resolving topological changes a large number interfaces two- three-dimensional spaces. Both bubbles fluid are compressible. In application by...
Abstract In a future fusion reactor, the main fuelling method will likely rely on injection of solid hydrogen pellets. Current predictions assume that this goal can be achieved, since being based technology which is already largely developed. However, belief founded modelling tools are usually aligned to observation made in existing devices and then extrapolated reactor conditions. This approach needs sound consideration its intrinsic restrictions any observed feature not reproduced by...
The internal structure and self-collapse properties of plasma liners, formed by the merger argon jets, have been studied via 3-dimensional numerical simulations using FronTier code. We shown that jets process is accomplished through a cascade oblique shock waves heat liner reduce its Mach number. Oblique adiabatic compression heating led to 10 times reduction pressure compared spherically symmetric with same density profiles at merging radius. also observed factor variations in leading edge...
Interaction of hadrons with electron beam in a modulator is an important part coherent cooling (CeC), novel method for hadron beams. Being untested technique, the CeC undergoing proof-of-principle test at Brookhaven National Laboratory (BNL). Simulation this process realistic propagating through quadrupole beamline constitutes very challenging problem. We successfully used code space these simulations and obtained accurate dependences modulation on position velocity ions. good numerical...
The influence of atomic physics processes on the implosion plasma liners for magneto-inertial nuclear fusion has been investigated numerically by using method front tracking in spherically symmetric geometry and equation state models accounting dissociation ionization. Simulation studies self-collapse argon to be used Los Alamos Plasma Liner Experiment (PLX) program have performed as well deuterium targets. Results show that converging reduce temperature increase Mach number results...
The finite resistivity magnetohydrodynamic code FRONTIER-MHD [R. Samulyak et al., Nucl. Fusion 47, 103 (2007)] is used to simulate the ablation rate of refueling pellets, including novel effect electrostatically induced E×B rotation cloud about its symmetry axis parallel magnetic field. key finding that centrifugal force pushes density radially outwards, creating a more “transparent” channel. With reduced shielding, steady state deuterium pellet significantly increases from ∼35% 100%,...
Processes occurring in a radio-frequency (rf) cavity, filled with high pressure gas and interacting proton beams, have been studied via advanced numerical simulations. Simulations support the experimental program on hydrogen gas-filled rf cavity Mucool Test Area (MTA) at Fermilab, broader research design of muon cooling devices. space, 3D electromagnetic particle-in-cell (EM-PIC) code atomic physics support, was used simulation studies. Plasma dynamics including process neutral ionization by...