scholarly journals Mechanism of merging of torsional Alfven and slow magnetosonic waves produced by train of laser pulses upon irradiation of a target located in a space plasma with a magnetic field. Laboratory modeling

2017 ◽  
Author(s):  
V. N. Tischenko ◽  
Yu. P. Zakharov ◽  
V. G. Posukh ◽  
A. G. Berezutsky ◽  
E. L. Boyarintsev ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Space Plasma ◽  
Laser Pulses ◽  
Laboratory Modeling ◽  
Field Laboratory

scholarly journals Electromagnetic Burst Generation during Annihilation of Magnetic Field in Relativistic Laser-Plasma Interaction

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Y. J. Gu ◽  
F. Pegoraro ◽  
P. V. Sasorov ◽  
D. Golovin ◽  
A. Yogo ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Current Sheet ◽  
Laser Plasma ◽  
Laser Pulses ◽  
Opposite Polarity ◽  
Laboratory Modeling ◽  
Relativistic Limit ◽  
Plasma Target ◽  
Formation And Evolution ◽  
Underdense Plasma

AbstractWe present the results of theoretical studies of formation and evolution of the current sheet in a colliosionless plasma during magnetic reconnection in relativistic limit. Relativistic magnetic reconnection is driven by parallel laser pulses interacting with underdense plasma target. Annihilation of laser created magnetic field of opposite polarity generates strong non-stationary electric field formed in between the region with opposite polarity magnetic field accelerating charged particles within the current sheet. This laser-plasma target configuration is discussed in regard with the laboratory modeling of charged particle acceleration and gamma flash generation in astrophysics. We present the results of 3-dimensional kinetic simulations and theoretical studies on the formation and evolution of the current sheet in a collisionless plasma during magnetic field annihilation in the ultra-relativistic limit. Annihilation of oppositively directed magnetic fields driven by two laser pulses interacting with underdense plasma target is accompanied by an electromagnetic burst generation. The induced strong non-stationary longitudinal electric field accelerates charged particles within the current sheet. Properties of the laser-plasma target configuration are discussed in the context of the laboratory modeling for charged particle acceleration and gamma flash generation in astrophysics.

The US National High Magnetic Field Laboratory: status and overview

1992 ◽  
Vol 177 (1-4) ◽  
pp. 16-21 ◽  
Author(s):  
J.E. Crow ◽  
N.S. Sullivan ◽  
D.M. Parkin
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
Field Laboratory ◽  
The Us

Helical Magnetic Cavities: Kinetic Model and Comparison with MMS Observations

2021 ◽  
Author(s):  
Jinghuan Li ◽  
Xuzhi Zhou ◽  
Fan Yang ◽  
Anton V. Artemyev ◽  
Qiugang Zong
Keyword(s):  
Magnetic Field ◽  
Kinetic Model ◽  
Pitch Angle ◽  
Maxwell Equations ◽  
Equilibrium Solution ◽  
Space Plasma ◽  
Azimuthal Magnetic Field ◽  
Particle Distributions ◽  
Multi Scale ◽  
Self Consistent

<p>Magnetic cavities are sudden depressions of magnetic field strength widely observed in the space plasma environments, which are often accompanied by plasma density and pressure enhancement. To describe these cavities, a self-consistent kinetic model has been proposed as an equilibrium solution to the Vlasov-Maxwell equations. However, observations from the Magnetospheric Multi-Scale (MMS) constellation have shown the existence of helical magnetic cavities characterized by the presence of azimuthal magnetic field, which could not be reconstructed by the aforementioned model. Here, we take into account another invariant of motion, the canonical axial momentum, to construct the particle distributions and accordingly modify the equilibrium model. The reconstructed magnetic cavity shows excellent agreement with the MMS1 observations not only in the electromagnetic field and plasma moment profiles but also in electron pitch-angle distributions. With the same set of parameters, the model also predicts signatures of the neighboring MMS3 spacecraft, matching its observations satisfactorily.</p>

scholarly journals Leptons from decay of mesons in the laser-induced particle pulse from ultra-dense protium p(0)

2016 ◽  
Vol 25 (10) ◽  
pp. 1650085 ◽  
Author(s):  
Leif Holmlid
Keyword(s):  
Magnetic Field ◽  
Beta Decay ◽  
Direct Observation ◽  
Weak Magnetic Field ◽  
Laser Pulses ◽  
Metal Foils ◽  
Decay Times ◽  
Magnetic Deflection

Kaons and pions are observed by their characteristic decay times of 12, 52 and 26 ns after impact of relatively weak ns-long laser pulses on ultra-dense hydrogen H(0), as reported previously. The signal using an ultra-dense protium p(0) generator with natural hydrogen is now studied. Deflection in a weak magnetic field or penetration through metal foils cannot distinguish between the types of decaying mesons. The signals observed are thus not caused by the decaying mesons themselves, but by the fast particles often at [Formula: see text][Formula: see text]MeV u[Formula: see text] formed in their decay. The fast particles are concluded to be mainly muons from their relatively small magnetic deflection and strong penetration. This is further supported by published studies on the direct observation of the beta decay of muons in scintillators and solid converters using the same type of p(0) generator.

The upgrade of the Oxford High Magnetic Field Laboratory

2000 ◽  
Vol 10 (1) ◽  
pp. 1552-1555 ◽  
Author(s):  
H. Jones ◽  
R.J. Nicholas ◽  
W.J. Siertsema
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
Field Laboratory

scholarly journals External Field-Controlled Ablation: Magnetic Field

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1662 ◽  
Author(s):  
Jovan Maksimovic ◽  
Soon Hock Ng ◽  
Tomas Katkus ◽  
Bruce C. C. Cowie ◽  
Saulius Juodkazis
Keyword(s):  
Magnetic Field ◽  
External Field ◽  
Surface Plasmon Polariton ◽  
Femtosecond Laser Ablation ◽  
Laser Pulses ◽  
Periodic Patterns ◽  
Fs Laser ◽  
Application Potential ◽  
Field Lines ◽  
The Magnetic Field

The femtosecond laser ablation of silicon amidst an externally applied magnetic field in different orientations was investigated with respect to the scanning direction and polarisation of the laser beam, by observation of ablation patterns and debris displacement in a range of fluences, magnetic fields strengths, and geometries. Ultra-short ∼ 230 fs laser pulses of 1030 nm wavelengths were utilised in the single and multi-pulse irradiation modes. Ablation with an externally applied magnetic B-field B e x t ≈ 0.15 T was shown to strongly affect debris formation and deposition. The mechanism of surface plasmon polariton (SPP) wave can explain the ablated periodic patterns observed with alignment along the magnetic field lines. The application potential of external field controlled ablation is discussed.

Laboratory and PIC simulations of collisionless interaction between expanding space plasma clouds and magnetic field with and without ionised background

2006 ◽  
Vol 133 ◽  
pp. 1025-1030
Author(s):  
D. Mourenas ◽  
F. Simonet ◽  
Yu. P. Zakharov ◽  
A. G. Ponomarenko ◽  
V. M. Antonov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Space Plasma
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