Collision-Driven Negative-Energy Waves and the Weibel Instability of a Relativistic Electron Beam in a Quasineutral Plasma

Karmakar, Anupam; Kumar, Naveen; Shvets, Gennady; Polomarov, Oleg; Pukhov, A.

doi:10.1103/physrevlett.101.255001

Cited by 27 publications

(32 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, periodic magnetic field is not obvious in the collisionless plasma bulk, indicating that the plasma only experiences very weak instability growth, which is consistent with the results reported in Ref. 21 that collisionless FI is completely shut down for a RE beam with a large transverse temperature. The instability stabilized by the RE transverse energy spread because of beam transverse temperature has already been mentioned in many previous literatures 20,37,38 .…”

Section: Resultssupporting

confidence: 81%

“…It is found that transverse temperature of beams can suppress the FI under certain conditions as it propagates in cold plasmas both in theoretical analysis and numerical simulations, but for a collisional plasma, the growth rate of instability will increase with plasma collision rate 20,21 or plasma resistivity (that is proportional to the collision rate) 22 , which can only be inhibited by external magnetic field 20,23 . In addition, collisional effects tend to attenuate the current FI for symmetric (where n h = n b , n h and n b are the relativistic and background electron density, respectively) or quasisymmetric counterstreaming while enhance it for extremely asymmetric counterstreaming (where n h ≪ n b ) 24 , which is in the context of laser-driven REs propagating in solid or compressed targets.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of filamentation instability on the divergence of relativistic electrons driven by ultraintense laser pulses

Yang

Zhuo

et al. 2016

Physics of Plasmas

View full text Add to dashboard Cite

Generation of relativistic electron (RE) beams during ultraintense laser pulse interaction with plasma targets is studied by collisional particle-in-cell (PIC) simulations. Strong magnetic field with transverse scale length of several local plasma skin depths, associated with RE currents propagation in the target, is generated by filamentation instability (FI) in collisional plasmas, inducing a great enhancement of the divergence of REs compared to that of collisionless cases. Such effect is increased with laser intensity and target charge state, suggesting that the RE divergence might be improved by using low-Z materials under appropriate laser intensities in future fast ignition experiments and in other applications of laser-driven electron beams.

show abstract

Section: Resultssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Effects of filamentation instability on the divergence of relativistic electrons driven by ultraintense laser pulses

Yang

Zhuo

et al. 2016

Physics of Plasmas

View full text Add to dashboard Cite

show abstract

“…35, 1504]. In particular, we find the present decoupling mechanism can well explain the recent numerical simulation results [Karmakar et al (2008). Phys.…”

supporting

confidence: 71%

Collisional effects on the relativistic current-filamentation instability in dense plasmas

et al. 2013

View full text Add to dashboard Cite

Collisional effects on the current-filamentation instability (CFI), accounting for the space charge effect (SCE), are investigated kinetically for a relativistic beam propagating in dense plasmas. It is shown that collisions can completely suppress the SCE in low temperature dense plasma, leading to enhancement of the CFI. This kind of decoupling mechanism is quite different from the well-known resistive mechanism [Molvig (1975). Phys. Rev. Lett. 35, 1504]. In particular, we find the present decoupling mechanism can well explain the recent numerical simulation results [Karmakar et al. (2008). Phys. Rev. Lett. doi: 101, 255001]. In the parameter regime related to the laser-solid interaction and fast ignition scenario (FIS), the CFI growth rate with SCE included is enhanced in the low plasma density region through the decoupling mechanism. In the high plasma density region, it is enhanced mainly through the resistive mechanism.

show abstract

“…The anomalous resistivity generated by the resulting highfrequency electric fluctuations has also been invoked as an additional mechanism for the enhancement of filamentation modes. 61,159 Complete suppression of the filamentation instability therefore appears difficult to achieve in the parameter range under consideration, as also further discussed in Ref. 23.…”

Section: -24mentioning

confidence: 99%

Multidimensional electron beam-plasma instabilities in the relativistic regime

2010

View full text Add to dashboard Cite

The interest in relativistic beam-plasma instabilities has been greatly rejuvenated over the past two decades by novel concepts in laboratory and space plasmas. Recent advances in this long-standing field are here reviewed from both theoretical and numerical points of view. The primary focus is on the two-dimensional spectrum of unstable electromagnetic waves growing within relativistic, unmagnetized, and uniform electron beam-plasma systems. Although the goal is to provide a unified picture of all instability classes at play, emphasis is put on the potentially dominant waves propagating obliquely to the beam direction, which have received little attention over the years. First, the basic derivation of the general dielectric function of a kinetic relativistic plasma is recalled. Next, an overview of two-dimensional unstable spectra associated with various beam-plasma distribution functions is given. Both cold-fluid and kinetic linear theory results are reported, the latter being based on waterbag and Maxwell-Jüttner model distributions. The main properties of the competing modes ͑developing parallel, transverse, and oblique to the beam͒ are given, and their respective region of dominance in the system parameter space is explained. Later sections address particle-in-cell numerical simulations and the nonlinear evolution of multidimensional beam-plasma systems. The elementary structures generated by the various instability classes are first discussed in the case of reduced-geometry systems. Validation of linear theory is then illustrated in detail for large-scale systems, as is the multistaged character of the nonlinear phase. Finally, a collection of closely related beam-plasma problems involving additional physical effects is presented, and worthwhile directions of future research are outlined.

show abstract

Collision-Driven Negative-Energy Waves and the Weibel Instability of a Relativistic Electron Beam in a Quasineutral Plasma

Cited by 27 publications

References 34 publications

Effects of filamentation instability on the divergence of relativistic electrons driven by ultraintense laser pulses

Effects of filamentation instability on the divergence of relativistic electrons driven by ultraintense laser pulses

Collisional effects on the relativistic current-filamentation instability in dense plasmas

Multidimensional electron beam-plasma instabilities in the relativistic regime

Contact Info

Product

Resources

About