Particle acceleration in collisionless shocks: Regulated injection and high efficiency

1979 ◽  
Author(s):  
David Eichler
Keyword(s):  
Particle Acceleration ◽  
High Efficiency ◽  
Collisionless Shocks

scholarly journals Collisionless shocks and particle acceleration: Lessons from studies of heliospheric shocks

2010 ◽  
Vol 6 (S274) ◽  
pp. 214-219
Author(s):  
Toshio Terasawa
Keyword(s):  
Particle Acceleration ◽  
Electron Acceleration ◽  
Shock Acceleration ◽  
Acceleration Process ◽  
Collisionless Shocks ◽  
Neutral Particles ◽  
Nonlinear Reaction

AbstractAcceleration processes at astrophysical collisionless shocks are reviewed with a special emphasis on the importance of in situ observations of heliospheric shocks. Topics to be included are nonlinear reaction of shock acceleration process, effect of neutral particles, and electron acceleration.

scholarly journals Three criteria for particle acceleration in collisionless shocks

2018 ◽  
Vol 36 (4) ◽  
pp. 458-464 ◽  
Author(s):  
Antoine Bret ◽  
Asaf Pe'er
Keyword(s):  
Particle Acceleration ◽  
Phase Space ◽  
Shock Front ◽  
Initial Density ◽  
Collisionless Shocks ◽  
Pair Plasma ◽  
The Subject ◽  
Do So

AbstractCollisionless shocks have been the subject on many studies in recent years, due to their ability to accelerate particles. In order to do so, a shock must fulfill three criteria. First, it must be strong enough to accelerate particles efficiently. Second, both the upstream and the downstream must be collisionless. Third, the shock front must be surrounded by electromagnetic turbulence capable of scattering particles back and forth. We here consider the encounter of two identical plasma shells with initial density, temperature, and velocity n0, T0, v0, respectively. We translate the three criteria to the corresponding requirements on these parameters. A non-trivial map of the allowed region for particle acceleration emerges in the (n0, T0, v0) phase space, especially at low velocities or high densities. We first assess the case of pair plasma shells, before we turn to electrons/protons.

scholarly journals Particle Acceleration and Plasma Heating at Collisionless Shocks in Solar Flares

1989 ◽  
Vol 104 (2) ◽  
pp. 325-328
Author(s):  
Peter J. Cargill ◽  
Loukas Vlahos
Keyword(s):  
Particle Acceleration ◽  
Energy Release ◽  
Solar Flares ◽  
Plasma Heating ◽  
Collisionless Shocks

AbstractRecent observations suggest that the energy release in solar flares may occur in many small bursts. If these bursts give rise to plasma heating, a large number of collisionless shocks will be generated. These shocks can individually heat plasma and accelerate particles, but the interaction of particles with many shocks as well, as of shocks with each other can give rise to further heating and acceleration.

scholarly journals High-efficiency acceleration by the combination of laser and electrostatic field

2014 ◽  
Vol 32 (4) ◽  
pp. 577-581 ◽  
Author(s):  
H. Lin ◽  
C.P. Liu ◽  
C. Wang ◽  
B.F. Shen
Keyword(s):  
Magnetic Field ◽  
Particle Acceleration ◽  
Charged Particle ◽  
Electric Field ◽  
Laser Field ◽  
High Efficiency ◽  
Single Body ◽  
Body Dynamics ◽  
High Kinetic Energy ◽  
Dc Electric Field

AbstractA new scheme of particle acceleration is verified by the investigation on single-body dynamics of charged particle in a compound field setup. This compound field setup contains a linear polarized laser field and a DC electric field which is along the direction of laser magnetic field. This setup can cause a charged particle to be of aperiodic motion and significantly high kinetic energy. Moreover, the contribution from the motion vertical to accelerating electric field is fully taken into account and is found to be essential to efficient acceleration. The efficiency of such a setup in acceleration is higher than that of a single laser.

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