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.
Highlights
This paper proposes a novel and effective method for generating GigaGauss level, solenoidal quasistatic magnetic fields in under-dense plasma using screw-shaped high intensity laser pulses
The MegaTesla magnetic fields are expected to exist inside neutron stars[6] and can be used to understand matter behavior under extreme conditions[7]
Fields of up to 1 kT strength are currently being generated using explosive magnetic generators[8] or high-current single shot targets driven by pulsed power generators[9], which are used to generate high intensity X-ray fluxes
Summary
For a simple estimation 1 GeV electron energy, which means γ = 2000, and Bx = 105 T magnetic field can be assumed resulting in Lcool ≈ 60μm, which is much shorter than the pulse depletion length[34]: L pd ≈ 0.45λp3/λL2 (λL/1 μm) I0[1018W/cm2]/1.4 ≈ 3.4 mm in the case of Sim[2] If the pulse length approaches or exceeds the bubble length, more uniform magnetic field can be observed (Figs 5b and 7a) In this regime, the azimuthal current can be resonantly driven if the plasma wavelength matches the spiral step of the laser pulse.
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