T.H.E.M.
¨We believe in the judgment; we believe this first judgment will take place as God revealed, in America...¨
T.H.E.M.
¨We believe in justice for all, whether in God or not; we believe as others, that we are due equal justice as human beings.¨
Evidence of Weibel-Generated Magnetic Fields
Greetings,
Evidence of Weibel-Generated Magnetic Fields
Inside the Omega Laser Facility’s target chamber during a shot. Experiments at this facility have provided insight into magnetic field generation.
Using a proton probe to directly image electromagnetic fields, scientists from the Lawrence Livermore National Laboratory present evidence of Weibel-generated magnetic fields that grow in opposing, initially unmagnetized plasma flows from laser-driven laboratory experiments.
The generation of cosmic magnetic fields has long intrigued astrophysicists. Since it was first described in 1959, a phenomenon known as Weibel filamentation instability — a plasma instability present in homogeneous or nearly homogeneous electromagnetic plasmas — has generated tremendous theoretical interest from astrophysicists and plasma physicists as a potential mechanism for seed magnetic field generation in the universe.
However, direct observation of Weibel-generated magnetic fields remained challenging for decades. In a Nature Physics paper published this week, Lawrence Livermore National Laboratory (LLNL) researchers report for the first time well-developed, oriented magnetic filaments generated by the Weibel mechanism in counter-streaming, collision-less flows generated by high-power lasers.
“Comparison with 3D particle-in-cell simulations and a first-principles theoretical treatment proves that the magnetic field generation in such flows is real, and quite efficient,” said lead author Channing Huntington, a physicist at LLNL.
The team’s findings demonstrate the power of the Weibel instability to produce small-scale seed magnetic fields throughout the cosmos, which can be then further amplified to larger scales, creating the ubiquitous magnetic fields that are seen to exist in astrophysical systems. In addition, Weibel-generated magnetic fields may trap plasma ions, creating localized shocks where cosmic ray particles could be accelerated….More Here
Click here for reuse options!Copyright 2015 Hiram's 1555 Blog