GigaGauss solenoidal magnetic field inside bubbles excited in under-dense plasma

Abstract

This paper proposes a novel and effective method for generating GigaGauss level, solenoidal quasi-static magnetic fields in under-dense plasma using screw-shaped high intensity laser pulses. This method produces large solenoidal fields that move with the driving laser pulse and are collinear with the accelerated electrons. This is in contrast with already known techniques which rely on interactions with over-dense or solid targets and generates radial or toroidal magnetic field localized at the stationary target. The solenoidal field is quasi-stationary in the reference frame of the laser pulse and can be used for guiding electron beams. It can also provide synchrotron radiation beam emittance cooling for laser-plasma accelerated electron and positron beams, opening up novel opportunities for designs of the light sources, free electron lasers, and high energy colliders based on laser plasma acceleration.

Plasma solenoid driven by a laser beam carrying an orbital angular momentum

“…Ali et al [9], consider a linearly polarized laser beam carrying Orbital Angular Momentum (OAM) [14] and analytically demonstrate that such a laser beam transfers its OAM to electron through the inverse bremsstrahlung dissipative process. Lécz et al [10] and Wang et al…”

“…Ali et al [9], consider a linearly polarized laser beam carrying Orbital Angular Momentum (OAM) [14] and analytically demonstrate that such a laser beam transfers its OAM to electron through the inverse bremsstrahlung dissipative process. Lécz et al [10] and Wang et al[15] numerically model the interaction of a screw-shaped laser pulse with an underdense plasma and observe laser to electron OAM transfer in the laser wakefield.In this letter, we demonstrate that a quasi-static axial magnetic field can be generated within a purely optical process, without any dissipative effects. It is produced in an underdense plasma irradiated by a radially polarized OAM laser beam, which is for example, experimentally designed by Li et al [16].…”

“…The generation of a quasi-static magnetic field in the laser-plasma interaction is a subject of many theoretical [1][2][3][4][5][6][7][8][9][10] and experimental studies [11][12][13]. Two approaches are considered: one consists in designing the target in such way that the interaction with the laser generates controlled azimuthal currents [7,8], another one proposes to transfer angular momentum from laser to electrons by using circularly polarized laser beam [1][2][3][4][5][6][11][12][13] or laser beam with a structured spatial shape [9,10]. In [1][2][3][4][5][6], the authors consider theoretically the magnetization of a medium exposed to a circularly polarized Gaussian laser beam.…”

Radiative spin polarization of electrons in an ultrastrong magnetic field

“…In storage rings, which use similar magnetic fields but much higher kinetic energies for the electrons, one can assume that the electrons can transition into a continuum of states, instead of a discrete spectrum, yielding the S&T-approximation [3,4]. New proposals for generating short-lived magnetic fields in plasmas created by ultrashort laser pulses allow for field strengths of 0.1-1 MT [15,16], which is three to four orders of magnitude beyond the field strengths that are available from non-destructive magnets [17]. Even stronger magnetic fields, up to 10 11 T can be found on the surface of neutron stars [18][19][20][21].…”

Generation of a wakefield undulator in plasma with transverse density gradient

“…For n 0 = 10 17 cm −3 this estimate gives E b ∼ 30 GV/m and B ∼ 100 T. We expect that in an optimized plasma undulator a considerable fraction of this magnetic field can be used. A solenoidal magnetic field of even much higher strength was demonstrated in computer simulation in the interaction of a screw-shaped laser pulse with under-dense plasma [17]. Derivation of the equations for plasma flow.-We first consider a plasma that has a transverse density gradient in x-direction independent of z and y as shown in Fig.…”