Polarized electron acceleration in beam-driven plasma wakefield based on density down-ramp injection

Wu, Yitong; Ji, Liangliang; Geng, Xuesong; Yu, Qin; Wang, Nengwen; Feng, Bo; Guo, Zhao; Wang, Weiqing; Qin, Chengyu; Yan, X. Q.; Zhang, Lingang; Thomas, Johannes; Hützen, Anna; Pukhov, A.; Büscher, M.; Shen, Baifei; Li, Ruxin

doi:10.1103/physreve.100.043202

Cited by 41 publications

(29 citation statements)

References 45 publications

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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: 66%

“…Taking <β x >~1/2, γ~1, <n(x)>~(α+1)n 0 /2 and <r>~r i /2 during the injection phase, one obtains <Ω>≈-5e<B ϕ >/4m≈-5e 2 (α+1)n 0 r i /64mε 0 , thus Δθ s~< Ω>~ΔT~-ηr i |r i | with η=5e 2 (α+1)n 0 /16mc 2 ε 0 . For simplicity, we assume a homogeneous electron distribution within the cylindrical injection volume of |r i |≤r b (x p ) [27][28][29], where r b (x p ) is the bubble radius at the density peak, satisfying r b 2 (x p )~4σ l σ r (n b0 /αn 0 ) 1/2 for PWFA [42,44] and r b 2 (x p )~4amc 2 ε 0 /αe 2 n 0 for LWFA [51]. Therefore, combining with the fact that ϕ~ϕ p , the polarization at certain ϕ p becomes…”

Section: Resultsmentioning

confidence: 99%

“…[23]) or by extracting polarized electrons directly (via photocathodes [21,24], spin filters [21,25] or beam splitters [21,26]) for subsequent acceleration in Linacs. Recently polarized electron generation based on plasma wakefields has been explored in simulations [27][28][29]. The idea includes preparation of pre-polarized targets via the photodissociation of hydrogen halides [30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spin Filter for Polarized Electron Acceleration in Plasma Wakefields

Geng

et al. 2020

Phys. Rev. Applied

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“…Despite many advances mostly on the theoretical side, several principal issues need to be addressed, for example: (i) is it possible to alter the polarization of an initially unpolarized target through interaction with relativistic laser pulses [31][32][33][34][35]? or (ii) are the spins so inert during the short acceleration period that a pre-polarized target is required [13,14,[36][37][38]? Following the work by Hützen et al [39], Wen et al [13] have proposed to generate highcurrent polarized electron beams in the interaction of an ultraintense laser pulse with a pre-polarized gas plasma, which is produced through photo-dissociation by a circularly polarized ultra-violet (UV) laser pulse [40].…”

Section: Introductionmentioning

confidence: 99%

Control of electron beam polarization in the bubble regime of laser-wakefield acceleration

Fan,

Liu,

et al. 2022

Preprint

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“…Simulations regarding shock-assisted injection have overwhelmingly been particle-in-cell simulations of the narrow region in which the laser interacts with the gas density transition [39][40][41][42]47 . Results can conveniently be compared to interferograms of the same field of view 27,37 .…”

Section: Introductionmentioning

confidence: 99%

Gas density structure of supersonic flows impinged on by thin blades for laser–plasma accelerator targets

et al. 2020

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Density transition injection is an effective technique for controllably loading electrons into a trapped phase for laser plasma accelerators. One common technique to achieve the required fluid structure is to impinge a thin blade on the plume of a supersonic nozzle. Density transitions induced in this way are often assumed to be bow shocks and therefore sharp, but two-dimensional simulations and fluorescence measurements presented in this work show that in many cases of interest the density transition accessible to a laser propagating transverse to the shock is an intercepting shock, and therefore shock thickness and density vary with pressure, laser height and blade position. The fluid dynamics of a supersonic nozzle impinged on by a thin, flat object are explored through simulations and relevant features verified via planar laser-induced fluorescence measurements. Implications of results for tuning electron beam injectors in laser plasma accelerators are discussed.

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Polarized electron acceleration in beam-driven plasma wakefield based on density down-ramp injection

Cited by 41 publications

References 45 publications

Spin Filter for Polarized Electron Acceleration in Plasma Wakefields

Spin Filter for Polarized Electron Acceleration in Plasma Wakefields

Control of electron beam polarization in the bubble regime of laser-wakefield acceleration

Gas density structure of supersonic flows impinged on by thin blades for laser–plasma accelerator targets

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