Polarized beam conditioning in plasma based acceleration

Vieira, Jorge; Huang, Chengkun; Mori, W. B.; Silva, L. O.

doi:10.1103/physrevstab.14.071303

Cited by 51 publications

(43 citation statements)

References 35 publications

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“…electron depolarization during LWFA. As shown below, spin depolarization mainly happens in the injection phase, which is in line with previous studies [29]. Recently, a method is proposed to mitigate this issue by fine tuning the focal position of the Gaussian laser beam to weaken the electron injection [30].…”

Section: Introductionsupporting

confidence: 81%

Polarized electron-beam acceleration driven by vortex laser pulses

Geng

et al. 2019

New J. Phys.

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We propose a new approach based on an all-optical set-up for generating relativistic polarized electron beams via vortex Laguerre-Gaussian (LG) laser-driven wakefield acceleration. Using a pre-polarized gas target, we find that the topology of the vortex wakefield resolves the depolarization issue of the injected electrons. In full three-dimensional particle-in-cell simulations, incorporating the spin dynamics via the Thomas-Bargmann Michel Telegdi equation, the LG laser preserves the electron spin polarization by more than 80% while assuring efficient electron injection. The method releases the limit on beam flux for polarized electron acceleration and promises more than an order of magnitude boost in peak flux, as compared to Gaussian beams. These results suggest a promising table-top method to produce energetic polarized electron beams.

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Section: Introductionsupporting

confidence: 81%

Polarized electron-beam acceleration driven by vortex laser pulses

Geng

et al. 2019

New J. Phys.

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“…Such field distributions are also seen in our simulations ( Fig.1 (a)). As already stated in previous works [27][28][29]45], the spin is preserved during steady acceleration but precesses dramatically during the injection phase. That is why we focus on the spin dynamics during injection, where typically one has γ<<1/a e [42,46] and the second term of Eq.…”

Section: Resultssupporting

confidence: 67%

Spin Filter for Polarized Electron Acceleration in Plasma Wakefields

Geng

et al. 2020

Phys. Rev. Applied

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We propose a filter method to generate electron beams of high polarization from bubble and blow-out wakefield accelerators. The mechanism is based on the idea to identify all electron-beam subsets with low-polarization and to filter them out by an X-shaped slit placed right behind the plasma accelerator.To find these subsets we investigate the dependence between the initial azimuthal angle and the spin of single electrons during the trapping process. This dependence shows that transverse electron spins preserve their orientation during injection if they are initially aligned parallel or anti-parallel to the local magnetic field. We derive a precise correlation of the local beam polarization as a function of the coordinate and the electron phase angle. Three-dimensional particle-in-cell simulations, incorporating classical spin dynamics, show that the beam polarization can be increased from 35% to about 80% after spin filtering. The injected flux is strongly restricted to preserve the beam polarization, e.g. <1kA in Ref.[27]. This limitation is removed by employing the proposed filter mechanism. The robust of the method is discussed that contains drive beam fluctuations, jitters, the thickness of the filter and initial temperature.This idea marks an efficient and simple strategy to generate energetic polarized electron beams based on wakefield acceleration.

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“…It is also found that a polarized electron beam can be produced from nonlinear Compton scattering with an elliptically polarized laser 6 . Along with the rapid development of ultrashort ultraintense laser technology and laser plasma wakefield acceleration scheme, tabletop compact spin polarized electron accelerators may be reality in the near future 7,8 .…”

Section: Introductionmentioning

confidence: 99%

Mapping electromagnetic fields structure in plasma using a spin polarized electron beam

Chen

et al. 2019

Physics of Plasmas

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We propose a scheme to mapping electromagnetic fields structure in plasma by using a spin polarized relativistic electron beam. Especially by using Particle-in-Cell (PIC) and electron spin tracing simulations, we have successfully reconstructed a plasma wakefield from the spin evolution of a transmitted electron beam. Electron trajectories of the probe beam are obtained from PIC simulations, and the spin evolutions during the beam propagating through the fields are calculated by a spin tracing code. The reconstructed fields illustrate the main characters of the original fields, which demonstrates the feasibility of fields detection by use of spin polarized relativistic electron beams.

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Polarized beam conditioning in plasma based acceleration

Cited by 51 publications

References 35 publications

Polarized electron-beam acceleration driven by vortex laser pulses

Polarized electron-beam acceleration driven by vortex laser pulses

Spin Filter for Polarized Electron Acceleration in Plasma Wakefields

Mapping electromagnetic fields structure in plasma using a spin polarized electron beam

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