scholarly journals Probing shock geometry via the charge to mass ratio dependence of heavy ion spectra from multiple spacecraft observations of the 2013 November 4 event

2016 ◽  
Vol 16 (12) ◽  
pp. 190 ◽  
Author(s):  
Lulu Zhao ◽  
Gang Li ◽  
Glenn M. Mason ◽  
Christina Cohen ◽  
Richard Mewaldt ◽  
...  
Keyword(s):  
Heavy Ion ◽  
Mass Ratio ◽  
Ratio Dependence ◽  
Multiple Spacecraft

scholarly journals Quasi-monoenergetic proton beam generation from a double-layer solid target using an intense circularly polarized laser

2009 ◽  
Vol 27 (3) ◽  
pp. 485-490 ◽  
Author(s):  
J.H. Bin ◽  
A.L. Lei ◽  
X.Q. Yang ◽  
L.G. Huang ◽  
M.Y. Yu ◽  
...  
Keyword(s):  
Double Layer ◽  
Ion Beam ◽  
Heavy Ion ◽  
Mass Ratio ◽  
Plasma Particle ◽  
Circularly Polarized ◽  
Particle In Cell ◽  
Beam Generation ◽  
Ion Plasma ◽  
Cell Simulation

AbstractMonoenegetic ion beam generation from circularly polarized laser-pulse interaction with a double-layer target is considered. The front layer consists of heavy-ion plasma, and the rear layer is a small thin coating of light-ion plasma. Particle-in-cell simulation shows that the multi-dimensional effects in the ion radiation pressure acceleration are avoided and a highly monoenergetic light-ion beam can be produced. Our simulations reveal that the charge-mass ratio of heavy ions in the front layer and the thicknesses of both layers can strongly affect the proton energy spectra.

Aspect and mass ratio dependence of microwave heating in silicon carbide fibers at 2.45 GHz

2018 ◽  
Vol 123 (21) ◽  
pp. 215108 ◽  
Author(s):  
K. Kashimura ◽  
T. Namioka ◽  
T. Fujii ◽  
N. Yoshikawa ◽  
H. Fukushima
Keyword(s):  
Silicon Carbide ◽  
Microwave Heating ◽  
Mass Ratio ◽  
Ratio Dependence ◽  
Silicon Carbide Fibers

scholarly journals Particle-in-Cell Simulation of Quasi-Neutral Plasma Trapping by RF Multipole Electric Fields

Physics ◽  
2019 ◽  
Vol 1 (3) ◽  
pp. 392-401 ◽  
Author(s):  
Nathaniel K. Hicks ◽  
Amanda Bowman ◽  
Katarina Godden
Keyword(s):  
Space Charge ◽  
Electric Fields ◽  
Initial Perturbation ◽  
Paul Trap ◽  
Heavy Ion ◽  
Higher Order ◽  
Mass Ratio ◽  
Total Electron ◽  
Particle In Cell ◽  
Neutral Plasma

Radio-frequency (RF) charged particle traps, such as the Paul trap or higher order RF multipole traps, may be used to trap quasi-neutral plasma. The presence of positive and negative plasma species mitigates the ejection of particles that occurs due to space charge repulsion. For symmetric species, such as a pair plasma, the trapped particle distribution is essentially equal for both species. For plasma with species of disparate charge-to-mass ratio, the RF parameters are chosen to directly trap the lighter species, leading to loss of the heavier species until sufficient net space charge develops to prevent further loss. Two-dimensional (2D) electrostatic particle-in-cell simulations are performed of cases with mass ratio m+/m− = 10, and also with ion–electron plasma. Multipole cases including order N = 2 (quadrupole) and higher order N = 8 (hexadecapole) are considered. The light ion-heavy ion N = 8 case exhibits particles losses less than 5% over 2500 RF periods, but the N = 8 ion–electron case exhibits a higher loss rate, likely due to non-adiabaticity of electron trajectories at the boundary, but still with low total electron loss current on the order of 10 μA. The N = 2 ion-electron case is adiabatic and stable, but is subject to a smaller trapping volume and greater initial perturbation of the bulk plasma by the trapping field.

scholarly journals Climbing halo merger trees with TreeFrog

2019 ◽  
Vol 36 ◽  
Author(s):  
Pascal J. Elahi ◽  
Rhys J. J. Poulton ◽  
Rodrigo J. Tobar ◽  
Rodrigo Cañas ◽  
Claudia del P. Lagos ◽  
...  
Keyword(s):  
Binding Energy ◽  
Merit Function ◽  
Massively Parallel ◽  
Mass Ratio ◽  
Ratio Dependence ◽  
Data Products ◽  
Accretion Rates ◽  
Dynamical Time ◽  
Radial Moments

AbstractWe present TreeFrog, a massively parallel halo merger tree builder that is capable comparing different halo catalogues and producing halo merger trees. The code is written in c++11, use the MPI and OpenMP API’s for parallelisation, and includes python tools to read/manipulate the data products produced. The code correlates binding energy sorted particle ID lists between halo catalogues, determining optimal descendant/progenitor matches using multiple snapshots, a merit function that maximises the number of shared particles using pseudo-radial moments, and a scheme for correcting halo merger tree pathologies. Focusing on VELOCIraptor catalogues for this work, we demonstrate how searching multiple snapshots spanning a dynamical time significantly reduces the number of stranded halos, those lacking a descendant or a progenitor, critically correcting poorly resolved halos. We present a new merit function that improves the distinction between primary and secondary progenitors, reducing tree pathologies. We find FOF accretion rates and merger rates show similar mass ratio dependence. The model merger rates from Poole, et al. [2017, 472, 3659] agree with the measured net growth of halos through mergers.

scholarly journals Applied holography of the AdS5–Kerr space–time

2019 ◽  
Vol 34 (24) ◽  
pp. 1950138 ◽  
Author(s):  
Brett McInnes
Keyword(s):  
Angular Momentum ◽  
Density Ratio ◽  
Kerr Black Hole ◽  
Heavy Ion ◽  
Momentum Density ◽  
Mass Ratio ◽  
De Sitter ◽  
Ion Collisions ◽  
Peripheral Collisions ◽  
Kerr Space

Asymptotically anti-de Sitter–Kerr black holes (we focus here on the five-dimensional case) are associated holographically with matter at conformal infinity which has a nonzero angular momentum density. It is natural to attempt to associate this angular momentum with the recently discovered vorticity of the plasmas produced in peripheral heavy-ion collisions. We assume that an AdS5–Kerr black hole with angular momentum to mass ratio [Formula: see text] is dual to boundary matter with an angular momentum density to energy density ratio also equal to [Formula: see text]. With this assumption, we find that, for collisions corresponding to a given value of [Formula: see text], there is a maximal possible angular velocity (well below the maximal value permitted by causality) for such matter at infinity, and that this value is in approximate agreement with the experimentally reported value of the average plasma vorticity produced in typical peripheral collisions of heavy ions.

Influence of Atomic Masses on the Coriolis Coupling Coefficients in some Symmetrical Molecules. Part III. Planar Symmetrical XY3 Molecules and Ions

1964 ◽  
Vol 19 (10) ◽  
pp. 1148-1150
Author(s):  
B. N. Cyvin ◽  
S. J. Cyvin ◽  
L. A. Kristiansen
Keyword(s):  
Molecular Model ◽  
Atomic Mass ◽  
Force Constants ◽  
Coriolis Coupling ◽  
Coupling Coefficients ◽  
Mass Ratio ◽  
Atomic Masses ◽  
Ratio Dependence ◽  
Upper Limits ◽  
Lower Limits

CORIOLIS coupling coefficients for the planar symmetrical XY3 molecular model are studied. One has found the upper limits |ζ23| → and ζ3 →· 1 with increasing atomic mass ratio mY/mX. Lower limits are also given, and appear to be functions of the force constants.Calculated ζ23 and ζ3 values for sixteen molecules (and radicals), and five ions of the considered type are reported. Curves are given for the mass-ratio dependence.

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