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

Fan, H. C.; Y., Liu, X.; Li, X. F.; Qu, Junfan; Yu, Qin; Kong, Q.; Weng, Shangkun; Chen, Min; Büscher, Markus; Gibbon, Paul; Kawata, Shigeo; Sheng, Z. M.

doi:10.1088/1367-2630/ac8951

Cited by 9 publications

(8 citation statements)

References 54 publications

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“…3(h)]. For LSP electrons, [67][68][69][70][71][72][73] the helicities of c photons contributed by the CP laser are almost identical to the case of SNP electrons for all energy regions radiated at both ends of the laser pulse with t Շ 23 T 0 and t տ 49 T 0 and e c Շ 1 GeV radiated at the middle of the laser pulse with 23 T 0 Շ t Շ 49 T 0 . However, at the middle of the laser pulse, the c photons with e c տ 1 GeV receive helicities from the scattering electrons and h c linearly falls (rises) as e c increases for h e ¼ À1 (h e ¼ 1) [see Fig.…”

Section: B Numerical Analysis Of Manipulation Of C-ray Polarizationmentioning

confidence: 77%

“…2 and 3(h)], then the transfer mechanism of SAM in strong NLCS will be verified. The high-energy LSP electrons can be generated in a controllable laser wakefield acceleration scheme, [67][68][69][70][71][72][73] in which a prepolarized gas target can be prepared experimentally via ultraviolet photodissociation of a hydrogen-halogen molecule. [74][75][76][77]…”

Section: Results and Discussion A Theoretical Analysis Of Manipulatio...mentioning

confidence: 99%

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Manipulation of γ-ray polarization in Compton scattering

Wang,

Ababekri,

Wan

et al. 2024

Physics of Plasmas

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High-brilliance high-polarization γ rays based on Compton scattering are of great significance in broad areas, such as nuclear physics, high-energy physics, astrophysics, etc. However, the transfer mechanism of spin angular momentum in the transition from linear through weakly into strongly nonlinear processes is still unclear, which severely limits the simultaneous control of brilliance and polarization of high-energy γ rays. In this work, we clarify the transfer mechanism in the transition regions and put forward a clear way to efficiently manipulate the polarization of emitted photons. We find that to simultaneously generate high-energy, high-brilliance, and high-polarization γ rays, it is better to increase the laser intensity for the initially spin-polarized electron beam. However, for the case of employing the initially spin-nonpolarized electron beam, in addition to increasing laser intensity, it is also necessary to increase the energy of the electron beam. Because the γ photon polarization emitted through the single-photon absorption channel is mainly attributed to the spin transfer of laser photons, while in multi-photon absorption channels, the electron spin plays a major role. Moreover, we confirm that the signature of γ-ray polarization can be applied to observing the nonlinear effects (multi-photon absorption) of Compton scattering with moderate-intensity laser facilities.

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Section: B Numerical Analysis Of Manipulation Of C-ray Polarizationmentioning

confidence: 77%

Section: Results and Discussion A Theoretical Analysis Of Manipulatio...mentioning

confidence: 99%

Manipulation of γ-ray polarization in Compton scattering

Wang,

Ababekri,

Wan

et al. 2024

Physics of Plasmas

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“…Detailed theoretical studies (see for example reference [56]) reveal that intense highly-polarized electron beams can be accelerated to multi-MeV energies via the "standard" bubble mechanism with 100-TW class lasers. It has been shown that the final spin direction strongly depends on the self-injection process (see figure 1) and, thus, a careful tuning and control of the laser and target parameters is mandatory.…”

Section: Increase In Efficiency and Stabilitymentioning

confidence: 99%

Plasma-based particle sources

Fuchs,

Andonian,

Apsimon

et al. 2024

J. Inst.

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High-brightness particle beams generated by advanced accelerator concepts have the potential to become an essential part of future accelerator technology. In particular, high-gradient accelerators can generate and rapidly accelerate particle beams to relativistic energies. The rapid acceleration and strong confining fields can minimize irreversible detrimental effects to the beam brightness that occur at low beam energies, such as emittance growth or pulse elongation caused by space charge forces. Due to the high accelerating gradients, these novel accelerators are also significantly more compact than conventional technology. Advanced accelerators can be extremely variable and are capable of generating particle beams with vastly different properties using the same driver and setup with only modest changes to the interaction parameters. So far, efforts have mainly been focused on the generation of electron beams, but there are concepts to extend the sources to generate spin-polarized electron beams or positron beams. The beam parameters of these particle sources are largely determined by the injection and subsequent acceleration processes. Although, over the last decade there has been significant progress, the sources are still lacking a sufficiently high 6-dimensional (D) phase-space density that includes small transverse emittance, small energy spread and high charge, and operation at high repetition rate. This is required for future particle colliders with a sufficiently high luminosity or for more near-term applications, such as enabling the operation of free-electron lasers (FELs) in the X-ray regime. Major research and development efforts are required to address these limitations in order to realize these approaches for a front-end injector for a future collider or next-generation light sources. In particular, this includes methods to control and manipulate the phase-space and spin degrees-of-freedom of ultrashort plasma-based electron bunches with high accuracy, and methods that increase efficiency and repetition rate. These efforts also include the development of high-resolution diagnostics, such as full 6D phase-space measurements, beam polarimetry and high-fidelity simulation tools. A further increase in beam luminosity can be achieve through emittance damping. Emittance cooling via the emission of synchrotron radiation using current technology requires kilometer-scale damping rings. For future colliders, the damping rings might be replaced by a substantially more compact plasma-based approach. Here, plasma wigglers with significantly stronger magnetic fields are used instead of permanent-magnet based wigglers to achieve similar damping performance but over a two orders of magnitude reduced length.

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“…More recently, the effect of bubble geometry on polarization of self-injection electrons has been studied. It was found that the deviation from a perfect spherical symmetry severely degrades the polarization of electron beam during the transverse injection [30] . Recently, Gong et al proposed that the collidingpulse injection scheme enables the production of quasimonoenergetic electron beams in excess of 80% polarization and tens of pC charge with commercial 10TW laser systems in a pre-polarized plasma [31,32] .…”

Section: Introductionmentioning

confidence: 99%

“…While these injection mechanisms have been investigated to control the polarization on LWFA electron beam [27][28][29][30][31][32][33] , the self-injection mechanism with relative simple setup still needs to be analyzed thoughtfully. There are two selfinjection schemes, transverse and longitudinal, as demonstrated in Ref.…”

Section: Introductionmentioning

confidence: 99%

Generation of polarized electron beams through self-injection in the interaction of a laser with a pre-polarized plasma

Yin,

Li,

et al. 2024

High Pow Laser Sci Eng

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Polarized electron beam production via laser wakefield acceleration in pre-polarized plasma is investigated by particlein-cell simulations. The evolution of the electron beam polarization is studied based on the Thomas-Bargmann-Michel-Telegdi equation for the transverse and longitudinal self-injection, and the depolarization process is found to be influenced by the injection schemes. In the case of transverse self-injection as found typically in the bubble regime, the spin precession of the accelerated electrons is mainly influenced by the wakefield. However, in the case of longitudinal injection in the quasi-one-dimensional regime (for example, F. Y. Li et al., Phys. Rev. Lett. 110, 135002 (2013)), the direction of electron spin oscillates in the laser filed. Since the electrons move around the laser axis, the net influence of the laser field is nearly zero and the contribution of the wakefield can be ignored. Finally, an ultra-short electron beam with polarization of 99% can be obtained using longitudinal self-injection.

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

Cited by 9 publications

References 54 publications

Manipulation of γ-ray polarization in Compton scattering

Manipulation of γ-ray polarization in Compton scattering

Plasma-based particle sources

Generation of polarized electron beams through self-injection in the interaction of a laser with a pre-polarized plasma

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