Electron energization during merging of self-magnetized, high-beta, laser-produced plasmas

2021 ◽  
Vol 87 (4) ◽  
Author(s):  
G. Fiksel ◽  
W. Fox ◽  
M.J. Rosenberg ◽  
D.B. Schaeffer ◽  
J. Matteucci ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Energy ◽  
Intense Laser ◽  
Energy Spectra ◽  
Laser Beams ◽  
Magnetized Plasmas ◽  
Plasma Plumes ◽  
Biermann Battery ◽  
High Beta

Electron energization during merging of magnetized plasmas is studied using the OMEGA and OMEGA EP laser facilities by colliding two plasma plumes, each containing a Biermann-battery self-generated magnetic field. Two neighbouring plasma plumes are produced by intense laser beams, and the anti-parallel Biermann fields merge and reconnect in the process of the plumes’ expansion and collision. To isolate the merging as an acceleration source, the electron energy spectra obtained from two-plume collision shots are compared with the spectra from single-plume shots. Single-plume shots exhibit an energized electron tail with energies up to ${\sim }250\ \textrm {keV}$ . The electrons in merging experiments are additionally accelerated by ${\sim }50\text {--}100$ keV compared to single-plume shots.

Electron Energy Spectra from Intense Laser Double Ionization of Helium

2001 ◽  
Vol 86 (13) ◽  
pp. 2762-2765 ◽  
Author(s):  
R. Lafon ◽  
J. L. Chaloupka ◽  
B. Sheehy ◽  
P. M. Paul ◽  
P. Agostini ◽  
...  
Keyword(s):  
Electron Energy ◽  
Double Ionization ◽  
Intense Laser ◽  
Energy Spectra

scholarly journals The combination of cold and hot components in the energy spectra of electrons scattered by relativistically intense laser pulses with various transverse distributions of amplitude

2016 ◽  
Vol 35 (1) ◽  
pp. 64-71 ◽  
Author(s):  
O.B. Shiryaev
Keyword(s):  
Electron Energy ◽  
Short Pulse ◽  
Laser Pulses ◽  
Intense Laser ◽  
Energy Spectra ◽  
Relativistic Energy ◽  
Optical Fields ◽  
First Order ◽  
Recent Experimental Study ◽  
Intense Laser Pulses

AbstractThe energy spectra of a sparse ensemble of electrons scattered by relativistically intense laser pulses are studied numerically by solving the relativistic Newton equations with the Lorentz force generated by an electromagnetic envelope in vacuum. The expressions for the envelope describe focused optical fields, include significant short-pulse corrections, and afford the representation of laser radiation with various types of transverse distributions of amplitude. The dependence of the character of the electron energy spectra on the type of the transverse distribution of laser amplitude is explored. For Gaussian pulses, the electron energy spectra within specific angular ranges tend to either include a relativistic maximum while being localized around it or to have the shapes of evanescent distributions dominated by the cold component. Conversely, the energy spectra of electrons ejected into certain angular ranges by laser pulses having first-order Laguerre profiles combine pronounced cold components and structured strongly relativistic features. The presumed laser pulse transverse structure and the shapes of the calculated electron energy spectra for first-order Laguerre amplitude distributions are shown to match, qualitatively, those reported in a recent experimental study by Kalashnikov et al. in 2015, which revealed the electron energy spectra spanning both the sub-relativistic and the markedly relativistic energy domains.

scholarly journals Accurate calculation of radiation damping parameters in the interaction between very intense laser beams and relativistic electron beams

2014 ◽  
Vol 32 (3) ◽  
pp. 477-486 ◽  
Author(s):  
Alexandru Popa
Keyword(s):  
Electromagnetic Field ◽  
Laser Beam ◽  
Relativistic Electron ◽  
Electron Energy ◽  
Electron Beams ◽  
Radiation Reaction ◽  
Radiation Damping ◽  
Intense Laser ◽  
Laser Beams ◽  
Relativistic Electron Beams

AbstractWe prove that the radiation damping force and the rate of change of the damping energy, in the Landau-Lifshitz forms, in interactions between very intense laser beams and relativistic electron beams, are periodic functions of only one variable, that is the phase of the electromagnetic field. The property is proved without using any approximation, in the most general case, when the degree of polarization of the electromagnetic field, the initial phase of the incident field and the initial energy of the electron have arbitrary values. This property leads to a strong simplification of the calculation of the radiation reaction parameters and of their dependence on the initial electron energy and angular frequency of the laser beam. Our analysis is performed in the proper inertial system of the electron. The radiation reaction is significant for laser beam intensities of the order 1022 W/cm2, and for electron energy greater than 1 GeV. The calculations reveal limitations of the method of generating hard radiations by interactions between laser beams and relativistic electron beams.

scholarly journals Acceleration of electrons by high intensity laser radiation in a magnetic field

2014 ◽  
Vol 32 (2) ◽  
pp. 205-210 ◽  
Author(s):  
Robert Melikian
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Wave ◽  
Laser Radiation ◽  
Electron Energy ◽  
Laser Intensity ◽  
Laser Pulses ◽  
Initial Energy ◽  
Photon Absorption ◽  
Intense Laser ◽  
Intense Laser Pulses

AbstractWe consider the acceleration of electrons in vacuum by means of the circularly-polirized electromagnetic wave, propagating along a magnetic field. We show that the electron energy growth, when using ultra-short and ultra-intense laser pulses (1 ps, 1018 W/cm2, CO2 laser) in the presence of a magnetic field, may reach up to the value 2,1 GeV. The growth of the electron energy is shown to increase proportionally with the increase of the laser intensity and the initial energy of the electron. We find that for some direction of polarization of the wave, the acceleration of electrons does not depend on the initial phase of the electromagnetic wave. We estimate the laser intensity, necessary for the electron acceleration. In addition, we find the formation length of photon absorption by electrons, due to which one may choose the required region of the interaction of the electrons with the electromagnetic wave and magnetic field. We also show that as a result of acceleration of electrons in the vacuum by laser radiation in a magnetic field one may obtain electron beam with small energy spread of the order δε/ε ≤ 10−2.

Nanostructures, Magnetic Field and Electron Energy Spectra

2016 ◽  
Vol 5 (4) ◽  
pp. 557-601 ◽  
Author(s):  
R. Bhattacharya ◽  
K. Sarkar ◽  
M. Kumar ◽  
B. Chatterjee ◽  
K. P. Ghatak
Keyword(s):  
Magnetic Field ◽  
Electron Energy ◽  
Energy Spectra

scholarly journals Effects of plasma turbulence on the nonlinear evolution of magnetic island in tokamak

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Minjun J. Choi ◽  
Lāszlo Bardōczi ◽  
Jae-Min Kwon ◽  
T. S. Hahm ◽  
Hyeon K. Park ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Nonlinear Evolution ◽  
Plasma Turbulence ◽  
Magnetized Plasmas ◽  
Tokamak Plasmas ◽  
Magnetic Islands ◽  
Magnetic Island ◽  
Reconnection Site ◽  
Ambient Turbulence

AbstractMagnetic islands (MIs), resulting from a magnetic field reconnection, are ubiquitous structures in magnetized plasmas. In tokamak plasmas, recent researches suggested that the interaction between an MI and ambient turbulence can be important for the nonlinear MI evolution, but a lack of detailed experimental observations and analyses has prevented further understanding. Here, we provide comprehensive observations such as turbulence spreading into an MI and turbulence enhancement at the reconnection site, elucidating intricate effects of plasma turbulence on the nonlinear MI evolution.

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