Surfatron and Stochastic Acceleration of Electrons at Supernova Remnant Shocks

McClements, K. G.; Dieckmann, Mark E; Ynnerman, Anders; Chapman, Sandra C.; Dendy, R. O.

doi:10.1103/physrevlett.87.255002

Cited by 92 publications

(95 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent particle-in-cell (PIC) simulation studies (Shimada & Hoshino 2003Dieckmann et al 2000Dieckmann et al , 2004aMcClements et al 2001) have examined these mechanisms with a particular focus on how and up to what energies the ESWs driven by non-relativistic or mildly relativistic ion beams can accelerate the electrons in the foreshock region.…”

Section: Introductionmentioning

confidence: 99%

Stabilisation of BGK modes by relativistic effects

Sircombe¹,

Dieckmann²,

Shukła³

et al. 2006

A&A

Self Cite

View full text Add to dashboard Cite

Context. We examine plasma thermalisation processes in the foreshock region of astrophysical shocks within a fully kinetic and self-consistent treatment. We concentrate on proton beam driven electrostatic processes, which are thought to play a key role in the beam relaxation and the particle acceleration. Our results have implications for the effectiveness of electron surfing acceleration and the creation of the required energetic seed population for first order Fermi acceleration at the shock front. Aims. We investigate the acceleration of electrons via their interaction with electrostatic waves, driven by the relativistic Buneman instability, in a system dominated by counter-propagating proton beams. Methods. We adopt a kinetic Vlasov-Poisson description of the plasma on a fixed Eulerian grid and observe the growth and saturation of electrostatic waves for a range of proton beam velocities, from 0.15c to 0.9c. Results. We can report a reduced stability of the electrostatic wave (ESW) with increasing non-relativistic beam velocities and an improved wave stability for increasing relativistic beam velocities, both in accordance with previous findings. At the highest beam speeds, we find the system to be stable again for a period of ≈160 plasma periods. Furthermore, the high phase space resolution of the Eulerian Vlasov approach reveals processes that could not be seen previously with PIC simulations. We observe a, to our knowledge, previously unreported secondary electron acceleration mechanism at low beam speeds. We believe that it is the result of parametric couplings to produce high phase velocity ESW's which then trap electrons, accelerating them to higher energies. This allows electrons in our simulation study to achieve the injection energy required for Fermi acceleration, for beam speeds as low as 0.15c in unmagnetised plasma.

show abstract

Section: Introductionmentioning

confidence: 99%

Stabilisation of BGK modes by relativistic effects

Sircombe¹,

Dieckmann²,

Shukła³

et al. 2006

A&A

Self Cite

View full text Add to dashboard Cite

show abstract

“…In multiple spatial dimensions, the phase space holes seem to be unstable and disintegrate, while computer simulations with strong magnetic fields indicate that standing electron holes can be stabilized and form phase space tubes perpendicular to the magnetic field direction [16], and where the stabilization of the electron holes occur if the electron gyrofrequency is larger than the bouncing frequency of the trapped electrons [17]. On the other hand, propagating electron holes can be destabilized by a magnetic field which is aligned perpendicular to the propagation direction [18], if the electron gyrofrequency is of the order of 10% of the electron plasma frequency, while PIC simulations where the gyrofrequency is 1% of the plasma frequency makes the electron hole more stable and an efficient surfing acceleration has the time to take place, which is needed for the Fermi acceleration at shocks [19].…”

Section: Introductionmentioning

confidence: 99%

Simulation study of surfing acceleration in magnetized space plasmas

Eliasson¹,

Dieckmann²,

Shukła

2005

New J. Phys.

View full text Add to dashboard Cite

Abstract. We present a numerical study of the surfing mechanism in which electrons are trapped in Bernstein-Greene-Kruskal (BGK) modes, and are accelerated across the magnetic field direction by the Lorentz force in magnetized space plasmas. The BGK modes are the product of an ion-beam Buneman instability that excites large-amplitude electrostatic upper-hybrid waves in the plasma. Our study, which is performed with particle-in-cell (PIC) and Vlasov codes, reveals the stability of the BGK mode as a function of the magnetic field strength and the ion beam speed. It is found that the surfing acceleration is more effective for a weaker magnetic field owing to the longer lifetime of the BGK modes. The importance of our investigation to electron acceleration in astrophysical environments has been emphasized. Contents

show abstract

“…Note, particle simulations (11) indicate that electron acceleration by the upper-hybrid wave can occur in this regime.…”

Section: Applicationmentioning

confidence: 95%

Stochastic ion heating by the lower-hybrid waves

Khazanov

Tel’nikhin

Krotov

2010

Radiation Effects and Defects in Solids

View full text Add to dashboard Cite

The resonance lower-hybrid wave-ion interaction is described by a group (differentiable map) of transformations of phase space of the system. All solutions to the map belong to a strange attractor, and chaotic motion of the attractor manifests itself in a number of macroscopic effects, such as the energy spectrum and particle heating. The applicability of the model to the problem of ion heating by waves at the front of collisionless shock as well as ion acceleration by a spectrum of waves is discussed.

show abstract

Surfatron and Stochastic Acceleration of Electrons at Supernova Remnant Shocks

Cited by 92 publications

References 9 publications

Stabilisation of BGK modes by relativistic effects

Stabilisation of BGK modes by relativistic effects

Simulation study of surfing acceleration in magnetized space plasmas

Stochastic ion heating by the lower-hybrid waves

Contact Info

Product

Resources

About