Abstract
Keywords
1 Introduction
Magnetic reconnection (MR) rapidly converts the magnetic field energy to the kinetic and thermal energies of the charged particles in plasmas with the topological variations[1–4]. It is one of the fundamental phenomena in astrophysics and is considered to participate in various processes such as coronal mass ejections[5,6], solar flares[7–9], closure of the planetary magnetosphere[10–12],
MR also plays important roles in laboratory plasmas on fusion instabilities[4,20–23] and the weakly ionized plasmas[24]. Early experiments on linear device with highly reproducible plasma presented clear maps of the magnetic fields with movable probe[25]. In the toroidal fusion devices such as Tokamaks, the plasmas tend to relax to a quasi-stationary state via the global magnetic self-organization based on MR process. Based on the features of magnetic field in the toroidal plasmas, the magnetically driven reconnection experiments are performed on the special devices such as magnetic reconnection experiment (MRX)[26,27] and versatile toroidal facility (VTF)[28]. The plasma density on such devices is relatively low being approximately equal to
The motivations of the studies in MR are mainly inspired by the explanations of the charged particle acceleration mechanisms in space plasmas[35–37]. Recent theoretical works discussed about the particle acceleration during the X-point collapse[38,39]. Based on the recent astrophysical observations of 100 MeV gamma flares from the synchrotron radiation of the Crab Nebula detected by Agileand Fermi-LAT[40,41], the high energy photons refer that the accelerated charged particles in the nebula have the energies with a magnitude of PeV. The temporal evolution of the
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The presence of high power laser facilities provides an unique way to investigate MR via laser-plasma interactions. Great progress has been achieved since the invention of the chirped pulse amplification techniques[46]. The state-of-the-art laser intensities exceed
With the increase of laser power, the laser-plasma interactions transit to collisionless relativistic and even ultra-relativistic regime in which high intensity electromagnetic waves, relativistic energetic charged particles are generated[62]. It makes a favourable condition to investigate the relativistic astrophysics processes mentioned above[63–65]. The MR in relativistic laser plasmas has been foreseen by Askar’yan et al. who conjectured that the interactions of magnetic field and electron beams under relativistic laser-plasma conditions would undergo the magnetic reconnection[66]. Recent kinetic simulations present MR process under the relativistic regime. The configuration of femtosecond laser pulses interacting with near critical density plasma was considered in Ref. [67]. In this case, the main contributions to inducing the electric field during reconnection come from the gradient of electron pressure tensor and the electrostatic turbulence according to the generalized Ohm’s law. Nonthermal electrons with several tens MeV energy were obtained. Due to the difficulties in preparing the experiments and the diagnostics, the research of relativistic MR is mainly addressed theoretically and numerically[68–71].
Considering the laser intensity further increases to the order of magnitude with the under construction facilities[49,72], the energy of the charged particles and the strength of the magnetic field are correspondingly enhanced. However, due to the relativistic constraint of the particle velocity, the electric current quickly saturates and can no longer sustain the variation of the local magnetic field. In such a case, the contribution from displacement current becomes significant and dominates the magnetic field annihilation and reconnection. This also implies that the resistive MHD approximation and the generalized Ohm’s law should be reconsidered[73,74]. Analysing this realm of processes, Syrovatskii[75] first proposed the dynamic dissipation of the magnetic field. Theoretical and numerical works demonstrated the intensive charged particles acceleration in the MR current sheet driven by inductive electric field and proved the important role of displacement current in such an ultra-relativistic process[76,77]. Recent kinetic simulation in a 3D geometry presented the electron ejection from the non-adiabatic region in MR, the formation and evolution of the current sheet with the growth of tearing-like mode instability[78]. Such ultra-relativistic MR is nontrivial and can be accessed in the near future with 10 PW class laser facilities. It will be in turn a great motivation to develop and construct high power lasers.
MR is a fundamental process which causes great interests in the past decades in space astrophysics, laboratory astrophysics, plasma and fusion physics. The basic theories within the frameworks of megnetohydrodynamics/electron magnetohydrodynamics (MHD/EMHD) and observations from astronomy have been reviewed in many articles and books[1–4,63,79–86]. Here in this paper, we briefly review the recent results obtained in the field of laser-driven ultra-relativistic MR in collisionless plasmas. Since the process is completely dynamical and non-stationary, it is out of the MHD scenario and must be described in kinetics. The paper is organized as follows. Simple models of magnetic annihilation are presented in Section 2. In Section 3, the magnetic field generation in ultra-relativistic laser-plasma interactions is introduced. Section 4 presents the process of MR and the out jets acceleration accompanied with magnetic field dissipation. The recently proposed regimes of MR for potential experiments are shown in Section 5. The basic theories will be introduced with the demonstrations of corresponding kinetic simulations performed by the relativistic particle-in-cell code EPOCH[87,88].
2 Some theoretical problems of magnetic annihilation
In one dimensional case, the reconnection of magnetic field lines is reduced to the annihilation of the opposite magnetic fields. Such a simplified model contains the most important feature of MR which refers the energy conversion from magnetic field to the electric field.
Here, in this section, we present a 1D model to illustrate the annihilation process under the conditions when oppositively directed magnetic fields are initially imposed in a homogenous plasma or in the vicinity of the thin current sheet. Such a configuration may appear due to the current sheet instability development or when a finite amplitude electromagnetic wave interacts with thin plasma slab[89]. As has been noticed above, the ultra strong magnetic field cannot be shielded by the thin layer of the collisionless plasma because the electric current density cannot exceed the value
Taking the layer thickness equal to the collisionless skin depth
This condition can be written as
Let us consider simple models for dynamics of strong electromagnetic field interacting with a thin current sheet and the plasma. We assume the current sheet localized in the
The Maxwell equations yield for the
The terms proportional to the time derivative of the Dirac delta function
2.1 Decay of magnetic field reversal configuration in collisionless plasma
First analyze the case of the magnetic field annihilation in a plasma. We assume that the initial (at
In the limit of small amplitude field the solution of Equation (4) is for the electric field
Here
In the limit of strong magnetic field, when Equation (3) is satisfied, we may use the ultra-relativistic approximation assuming
The solution is valid at time less than
Figure 1.(a) The initial condition of 1D model. (b) Magnetic field annihilation and electric field growing.
The expected electric field growing is shown in Figure 1(b). The strength of magnetic field significantly decreases near the critical point of
2.2 Finite amplitude opposite polarity electromagnetic wave interaction with thin current layer
Now we consider the finite amplitude electromagnetic wave collision with the electric current carrying thin plasma layer. This current sheet in the
An electromagnetic wave of amplitude
Equation (12) can be written by using the d’Alembert relationship, giving the solution of the Cauchy problem for the wave equation, as
To find the function
One may see from Equation (15) that if the amplitude of the electromagnetic wave is substantially large,
Consequently, the unlimited acceleration of charged particles occurs with the particle momentum growing as
Substituting the function
We note that the solution found here corresponds to the paradigm of the thin foil nonlinear electrodynamics developed in Refs. [89,91–94].
2.3 Tearing mode instability of thin current layer
The 2D dynamics of thin current sheet is considered within the framework of the tearing mode instability concept. The electromagnetic tearing mode instability of thin current sheet has been studied in Refs. [37,89,95–97]. The electromagnetic field given by the vector
The solution of Equations (22) and (23) yields
Setting
We assume that the unperturbed electric current density and electric charge density are
Obtained within the framework of cold electron and ion hydrodynamics approximation
In the short wavelength limit, when
In the long wavelength limit, when
For high enough electron energy, in the range
Following from Equation (33) in the non-relativistic limit, when
2.4 The electric and magnetic field configuration arising during decay of thin current sheet
In the case of a thin current sheet localized in the
In other words the current sheet breaks into halves, which move apart along the
The electromagnetic field (it is the normalized electromagnetic potential
Solving the Cauchy problem for Equations (36) and (37) with the surface electric current density given by Equation (35), we find the electric field
Figure 2.Contours of equal value of the electric field in the
The
The
At the point
In the non-relativistic limit of the current sheet evolution for
In the ultra-relativistic case, with
In the vicinity of the point
We see that the electric field
Using the relationships obtained above for the electric and magnetic fields near the point
This expression describes nonstationary zero line of the magnetic field of hyperbolic type. The electric field directed along the zero line is constant, while the gradient of the magnetic field decreases inversely proportional to the time.
3 Spontaneous magnetic field generation in laser-plasma interaction
3.1 Thermoelectric field and ponderomotive driven field
Considering unmagnetized plasmas with ideal MHD condition, the electrons move quickly along the temperature and density gradients due to their small inertia. The non-neutral charge distribution generates an electric field. Combine the ideal Ohm’s law (Equation (46)) and Cauchy momentum Equation (47),
Such a field is the response of the plasma to prevent the electrons motion according to the gradients in electron pressure. Applying curl on Equation (48) and plugging in Faraday’s law (Equation (9)), it yields
Using the equation of state,
When the laser intensity becomes higher, the ponderomotive force of the laser field expels the electrons away from the focal spot and significantly changes the local density distributions forming sharp density gradients. By the continuous radiation pushing, the background electrons are prevented from returning and shielding against the charge separation field. A ponderomotive electric current is formed
3.2 Static magnetic field driven by energetic electron beam
The generation of magnetic field based on ultra intense laser-plasma interactions has been investigated intensively in recent years[104–106]. Furthermore, the interactions of beam-plasma are also discussed for strong magnetic dipoles generation[107,108]. The magnetic field generation under the condition of ultra-intense laser interacting with underdense or near critical density plasma is discussed in this section. The ultra-intense laser considered here means the corresponding intensity exceeds the relativistic threshold (
The strong ponderomotive force quickly expels electrons from the laser path and leaves an electron plasma channel which has a positive charge background since ions with heavier inertia response slowly. Balancing the electron energy gain and loss from the laser and the electrostatic potential,
The charge separation field in the plasma channel appears at the wake of the laser pulse and forms the so-called wakefield[111]. In a relatively low density collisionless plasma, the induced wakefield, following the laser pulse, propagates with a phase velocity close to the speed of light in vacuum. The electrons injected into the acceleration phase of the wakefield with the initial velocity close to the wakefield phase velocity can be trapped and accelerated. The strength of the wakefield behind the laser pulse has been analytically studied[112],
The trapped and accelerated electron beam generates a current along the plasma channel. In the case of near critical density plasma, the accelerated beam contains a large electric charge resulting in a strong direct current. Consequently, the azimuthal magnetic field confined in the plasma channel is produced. From Ampere-Maxwell law,
An example of kinetic simulation is presented here to demonstrate the details of the process. Linear polarized laser with the intensity
Figure 3.The numerical demonstration of static magnetic field driven by energetic electron beam. (a) The electron density distribution with the plasma channel formation. (b) The blue and red curves represent the longitudinal electric field and the electron density profile on the laser axis (). (c) The average energy distribution of the electrons. (d) The
The profile of the longitudinal electric field along the laser axis (
Equation (62) indicates that the magnetic field has a relatively long time scale in the ultra-intense laser case, which is important for designing the corresponding experiment.
4 Relativistic MR and magnetic field energy dissipation
4.1 Magnetic dipole expansion
Figure 4.(a) The transverse expansion of the magnetic dipole along a density downramp region. The distributions of at different snapshots are combined here. (b) The profiles of along different -coordinates.
The expansion of the magnetic dipole in the density downramp provides an optimal condition for the study of MR. By sending two parallel identical laser pulses into the plasma (laser axes distributed at
Therefore, with the expansion of the two magnetic dipoles, the opposite magnetic polarities approach at the central region in transverse, where the magnetic field annihilation and the field line reconnection are expected to occur.
Figure 5.(a) The energy density distribution () of electrons. The round circles represent the azimuthal magnetic fields. The projections of components in (b) the uniform density region and (c) the density downramp region.
4.2 Magnetic field annihilation and field line reconnection
The 2D magnetic configuration in the transverse plane (
Figure 6.(a) and (b) are contours of the constant vector potentials around the -point based on theoretical model. (a) refers to the initial stage when the opposite magnetic fields just begin to vanish. (b) refers to the moment when the current sheet in MR has formed and bifurcated. (c) and (d) are the corresponding distributions demonstrated by numerical simulations.
Therefore the charged particles can be accelerated during MR via such an electric field produced by the rapid change of magnetic field, which will be discussed in detail in the next section. The current driven by the accelerated particles generates an extra magnetic field represented by the blue curve in Figure 6(b). The new magnetic field changes the field topology and the
Here
Recalling Equation (70), the electric field is given as
The 2D configuration of magnetic field lines and the constant vector potential is demonstrated by a 3D numerical simulation. The curves and the vectors in Figures 6(c) and 6(d) present the contour magnetic field strength and the magnetic field lines with directions. The formation of
With the process of MR and the development of tearing instability, the
4.3 Relativistic magnetic field dissipation and inductive electric field generation
Recalling Ampere-Maxwell law in Equation (57), the term of displacement current (
However, in the relativistic regime of MR, such a relation is not always satisfied. Considering the situation of ultra-intense laser interacting with underdense or near critical density plasma, substituting the magnetic field with Equation (58), one obtains
Here the velocities of the relativistic charged particles are assumed to reach their upper limits of the light speed. As mentioned above, the current sheet is formed in the density downramp region where the magnetic dipoles are expanding, which implies the local density is much lower than the density plateau where the energetic electron beams and static magnetic fields are formed, i.e.,
The displacement current plays an important role here to balance the fast magnetic field variation and converts the energy from magnetic field to electric field. The growing inductive electric field indicates the relativistic MR is a non-stationary process violating the freezing-in condition and the corresponding Ohm law should be modified[73,74]. Due to the non-stationary feature, the relativistic MR is also proposed as dynamic dissipation of magnetic field[75].
Figure 7.(a) The magnetic field distributions in the simulation when MR is occurring. (b) The surface represents the distribution of longitudinal electric field (). The curves are the profiles of all the components in Ampere-Maxwell law (
4.4 Charged particle acceleration in relativistic MR
Figure 8.The energy distributions of the electrons inside current sheet before and after magnetic field reconnection.
Figure 9.(a) Schematic of the theoretical model in the vicinity of -point. (b) The analytical solutions of particles motion with the expressions in
The charged particle motion is dominated by Lorentz force
According to Equation (81), the particle motion in the longitudinal direction is homogeneous and can be obtained with time integral,
The acceleration process in MR can be derived with respect to non-relativistic and relativistic conditions[117]. Here we shall focus on the relativistic case of charged particle acceleration driven by inductive electric field. The characteristic scale length of electron motion in MR region can be estimated as the Larmor radius
Considering the particles are only accelerated by the longitudinal electric field,
The longitudinal motion of the accelerated charged particle in relativistic case is simply as
Here
In the region of current sheet, where
From the equation of motion for
Since the particles are accelerated to relativistic energy which is much higher than its initial energy
In the above presented analysis of the charged particle acceleration in the vicinity of hyperbolic zero line of the magnetic field, Equations (79) and (80) describe the configuration with constant gradient of the magnetic field, i.e.,
The solutions of the analytical model for the accelerated particle trajectories as functions of time along
5 Potential experimental setup for relativistic MR
As demonstrated above, high power laser provides unique methods to investigate MR and model the corresponding astrophysics phenomena in terrestrial environment laboratory. MR experiments driven by laser-plasma interaction in MHD scale with moderate laser intensity have been discussed in the previous sections; here we present several recent proposals for relativistic MR by using PW-class laser pulses. One of the main difficulties in laser-driven relativistic MR is the synchronization of the incident laser pulses. The delay between the pulses should not be larger than the length of the magnetic dipole (
5.1 Relativistic MR with higher order mode laser
A Hermite-Gaussian mode beam in the transverse plane propagating in
Here
Figure 10.(a) The intensity distribution of mode laser on the focused plane and (b) the corresponding profile. (c) The electron density distribution and (d) the distribution obtained from numerical simulations in the interaction of mode laser with plasma.
5.2 Laser split by solid cone target
Figure 11.(a) The evolution of incident laser intensity before and after interacting with the solid cone target. A loop structure (donut shape) is formed. (b) The electron density distribution driven by the donut shape field. The rear plane corresponds to the density distribution slice of . The left plane is the projection of the slice of . The bottom plane is the projection of magnetic field distribution, which shows the magnetic dipoles are formed.
The electron density distribution driven by the fields after splitting also presents a ring structure in the transverse plane as shown in Figure 11(b) the left plane. In the longitudinal plane (
6 Summary
During interaction of ultra-intense lasers with plasma targets strong static magnetic fields can be generated via the electric current produced by the energetic electron beams accelerated by the laser. In the relativistic laser plasma the generated magnetic field plays an active role leading to the magnetic interaction and coalescence of the self focusing channels, their bending, and accumulating of the magnetic energy[120,121]. The magnetic field left behind the ultra-short laser pulse as well as at the vacuum plasma interface has a pattern determined by the electron vortices[122], which can annihilate[123] resulting in the electron and ion acceleration[124,125].
As noticed in a review article[63], the development of high-power lasers provides the necessary conditions for experimental physics where it will become possible to study relativistic regimes of the magnetic field line reconnection, making the area of relativistic laser plasmas attractive for modeling key processes for relativistic astrophysics. Reconnection of magnetic field lines implies oposite-polarity magnetic field interaction in the high electric conductivity plasma.
Ultra-relativistic regime of interaction of oppositely directed magnetic fields can be realized in the configuration with double laser pulses irradiating a tailored plasma target. The laser pulses drive the wake field accelerating the electrons whose electric current generates strong magnetic fields colliding in the low density plasma region. The opposite magnetic field polarities annihilation converts the magnetic field to an induced electric field accompanied with the variation of the magnetic field line topology and formation of thin current sheet. It is proved that the displacement current plays an important role in such relativistic MR due to the constraint of the conduction current carried by the electrons. The strong displacement current induces a fast growing inductive electric field which accelerates the charged particles inside the current sheet, i.e., the magnetic field finally transfers to the particle kinetic energy. The evolution of the current sheet via the tearing mode instability development leads to the magnetic island formation. As one of the signatures of MR, the out-jets trajectories are described both analytically and demonstrated numerically. Several setups are proposed here for the potential MR experiment to be carried out on the high power laser facilities. What we presented here proves the possibility to investigate and model the ultra-relativistic astrophysical phenomenon in the laboratory via laser-plasma interactions.
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