Effect of ion-to-electron mass ratio on the evolution of ion beam driven instability in particle-in-cell simulations

2012 ◽  
Vol 19 (9) ◽  
pp. 092111 ◽  
Author(s):  
Jinhy Hong ◽  
Ensang Lee ◽  
Kyoungwook Min ◽  
George K. Parks
Keyword(s):  
Ion Beam ◽  
Electron Mass ◽  
Mass Ratio ◽  
Particle In Cell

scholarly journals Dependence of kinetic plasma waves on ion-to-electron mass ratio and light-to-Alfvén speed ratio

2020 ◽  
Vol 494 (2) ◽  
pp. 2905-2911
Author(s):  
Daniel Verscharen ◽  
Tulasi N Parashar ◽  
S Peter Gary ◽  
Kristopher G Klein
Keyword(s):  
Linear Theory ◽  
Debye Length ◽  
Dispersion Relations ◽  
Speed Ratio ◽  
Electron Mass ◽  
Mass Ratio ◽  
Particle In Cell ◽  
Background Magnetic Field ◽  
Collective Plasma ◽  
The Impact

ABSTRACT The magnetization |Ωe|/ωe is an important parameter in plasma astrophysics, where Ωe and ωe are the electron gyro-frequency and electron plasma frequency, respectively. It depends only on the mass ratio mi/me and the light-to-Alfvén speed ratio c/vAi, where mi (me) is the ion (electron) mass, c is the speed of light, and vAi is the ion Alfvén speed. Non-linear numerical plasma models such as particle-in-cell simulations must often assume unrealistic values for mi/me and for c/vAi. Because linear theory yields exact results for parametric scalings of wave properties at small amplitudes, we use linear theory to investigate the dispersion relations of Alfvén/ion-cyclotron and fast-magnetosonic/whistler waves as prime examples for collective plasma behaviour depending on mi/me and c/vAi. We analyse their dependence on mi/me and c/vAi in quasi-parallel and quasi-perpendicular directions of propagation with respect to the background magnetic field for a plasma with βj ∼ 1, where βj is the ratio of the thermal to magnetic pressure for species j. Although their dispersion relations are largely independent of c/vAi for c/vAi ≳ 10, the mass ratio mi/me has a strong effect at scales smaller than the ion inertial length. Moreover, we study the impact of relativistic electron effects on the dispersion relations. Based on our results, we recommend aiming for a more realistic value of mi/me than for a more realistic value of c/vAi in non-relativistic plasma simulations if such a choice is necessary, although relativistic and sub-Debye-length effects may require an additional adjustment of c/vAi.

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.

scholarly journals New Limit on Space-Time Variations in the Proton-to-Electron Mass Ratio from Analysis of Quasar J110325-264515 Spectra

Symmetry ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 344
Author(s):  
T. D. Le
Keyword(s):  
Fine Structure ◽  
Structure Constant ◽  
Space Time ◽  
Fine Structure Constant ◽  
Electron Mass ◽  
Mass Ratio ◽  
Quasar Spectra ◽  
Time Variations ◽  
Using Data ◽  
The Universe

Astrophysical tests of current values for dimensionless constants known on Earth, such as the fine-structure constant, α , and proton-to-electron mass ratio, μ = m p / m e , are communicated using data from high-resolution quasar spectra in different regions or epochs of the universe. The symmetry wavelengths of [Fe II] lines from redshifted quasar spectra of J110325-264515 and their corresponding values in the laboratory were combined to find a new limit on space-time variations in the proton-to-electron mass ratio, ∆ μ / μ = ( 0.096 ± 0.182 ) × 10 − 7 . The results show how the indicated astrophysical observations can further improve the accuracy and space-time variations of physics constants.

scholarly journals Accurate prediction of H3O+and D3O+sensitivity coefficients to probe a variable proton-to-electron mass ratio

2015 ◽  
Vol 454 (3) ◽  
pp. 2292-2298 ◽  
Author(s):  
A. Owens ◽  
S. N. Yurchenko ◽  
O. L. Polyansky ◽  
R. I. Ovsyannikov ◽  
W. Thiel ◽  
...  
Keyword(s):  
Accurate Prediction ◽  
Electron Mass ◽  
Mass Ratio ◽  
Sensitivity Coefficients

scholarly journals The Uehling correction to the energy levels in a pionic atom

2006 ◽  
Vol 84 (2) ◽  
pp. 107-113 ◽  
Author(s):  
S G Karshenboim ◽  
E Yu. Korzinin ◽  
V G Ivanov
Keyword(s):  
Free Electron ◽  
Vacuum Polarization ◽  
Energy Levels ◽  
Analytic Form ◽  
Electron Mass ◽  
Mass Ratio ◽  
Pionic Atom ◽  
Closed Analytic Form

We consider a correction to energy levels in a pionic atom induced by the Uehling potential, i.e., by a free electron vacuum-polarization loop. The calculation is performed for circular states (l = n–1). The result is obtained in a closed analytic form as a function of Zα and the pion-to-electron mass ratio. Certain asymptotics of the result are also presented.PACS Nos.: 12.20.Ds, 36.10.Gv

scholarly journals Fundamental physics and the fine-structure constant

2017 ◽  
Vol 5 (2) ◽  
pp. 46 ◽  
Author(s):  
Michael Sherbon
Keyword(s):  
Fine Structure ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Electron Mass ◽  
Fundamental Constants ◽  
Mass Ratio ◽  
Fundamental Physics ◽  
Weak Force ◽  
Strong Force ◽  
Symmetry Principles

From the exponential function of Euler’s equation to the geometry of a fundamental form, a calculation of the fine-structure constant and its relationship to the proton-electron mass ratio is given. Equations are found for the fundamental constants of the four forces of nature: electromagnetism, the weak force, the strong force and the force of gravitation. Symmetry principles are then associated with traditional physical measures.

scholarly journals First Constraint on Cosmological Variation of the Proton-to-Electron Mass Ratio from Two Independent Telescopes

2011 ◽  
Vol 106 (18) ◽  
Author(s):  
F. van Weerdenburg ◽  
M. T. Murphy ◽  
A. L. Malec ◽  
L. Kaper ◽  
W. Ubachs
Keyword(s):  
Electron Mass ◽  
Mass Ratio

scholarly journals New constraint on cosmological variation of the proton-to-electron mass ratio from Q0528−250

2011 ◽  
Vol 417 (4) ◽  
pp. 3010-3024 ◽  
Author(s):  
Julian A. King ◽  
Michael T. Murphy ◽  
Wim Ubachs ◽  
John K. Webb
Keyword(s):  
Electron Mass ◽  
Mass Ratio
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