Manipulating the topological structure of ultrarelativistic electron beams using Laguerre–Gaussian laser pulse

Ju, L. B.; Zhou, C. T.; Jiang, Ke; Huang, T. W.; Zhang, H.; Cao, J. M.; Qiao, B.; Ruan, Shuangchen

doi:10.1088/1367-2630/aac68a

Cited by 43 publications

(33 citation statements)

References 48 publications

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“…With the aid of the results of [54,55], we investigate the coherence of such a radiation created by particle beams and the conditions when transition and Vavilov-Cherenkov (VCh) radiations can be used as a pure bright source of twisted photons. In particular, we show that the helically microbunched beams [56][57][58][59][60][61][62][63][64][65] with a certain helix pitch and transverse size produce coherent twisted transition and VCh radiations with large projection of the total angular momentum. Notice that coherent transition and VCh radiations of plane-wave photons were discussed in many papers and books (see, e.g., [45,[66][67][68][69][70][71]).…”

Section: Introductionmentioning

confidence: 92%

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Probability of radiation of twisted photons in an inhomogeneous isotropic dispersive medium

2019

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The general formula for probability to record a twisted photon produced by a charged particle moving in an inhomogeneous isotropic dispersive medium is derived. The explicit formulas for probability to record a twisted photon are obtained for the radiation of a charged particle traversing a dielectric plate or an ideally conducting foil. It is shown that, in the case when the charged particle moves along the detector axis, all the radiated twisted photons possess a zero projection of the total angular momentum and the probability of their radiation is independent of the photon helicity. The radiation produced by helically microbunched beams of charged particles is also considered. The fulfillment of the strong addition rule for the projection of the total angular momentum of radiated twisted photons is demonstrated. Thus the helical beams allow one to generate coherent transition and Vavilov-Cherenkov radiations with large projections of the total angular momentum. The radiation produced by charged particles in a helical medium is studied. Typical examples of such a medium are metallic spirals and cholesteric liquid crystals. It is shown that the radiation of a charged particle moving along the helical axis of such a medium is a pure source of twisted photons. *

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Section: Introductionmentioning

confidence: 92%

“…7). The same situation happens in a plasma perturbed by the helical wave of phonons or photons [63][64][65]108]. However, in order to describe the radiation of twisted photons quantitatively, one needs to take a spatial dispersion into account in this case.…”

Section: Helical Mediummentioning

confidence: 99%

Probability of radiation of twisted photons in an inhomogeneous isotropic dispersive medium

2019

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“…These bunches provide a generalization of axially symmetric bunches for which the radiation of twisted photons was considered in [10]. Nowadays, there are several techniques to create such bunches [2,3,6,18,19,25,26,[76][77][78]. The helical bunches were used in [3] for generation of twisted photons by undulators at the first harmonic.…”

Section: Coherent Interference Factormentioning

confidence: 99%

Probability of radiation of twisted photons by cold relativistic particle bunches

2020

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The probability to record a twisted photon produced by a cold relativistic particle bunch of charged particles is derived. The radiation of twisted photons by such particle bunches in stationary electromagnetic fields and in propagating electromagnetic waves is investigated. Several general properties of both incoherent and coherent contributions to the radiation probability of twisted photons are established. It is shown that the incoherent radiation by bunches of particles traversing normally an isotropic dispersive medium (the edge, transition, and Vavilov-Cherenkov radiations) and by bunches moving in a helical undulator does not depend on the azimuthal distribution of particles in the bunch and is the same as for round bunches. As for planar undulators, the incoherent radiation by particle bunches is the same as for the bunches symmetric under reflection with respect to the axis of a twisted photon detector. At high energies of recorded twisted photons, this property is universal and holds for the forward incoherent radiation by any cold relativistic particle bunch. The coherent radiation of twisted photons by such particle bunches obeys the property that we call the addition rule. This rule provides a simple means to describe the properties of coherent radiation of twisted photons. Furthermore, the strong addition rule is established for the coherent radiation by sufficiently long helical bunches. The use of this rule allows one to elaborate superradiant pure sources of twisted photons. The coherent radiation by helical bunches is considered for the edge, transition, and Vavilov-Cherenkov processes and for particles moving in undulators and plane laser waves with circular polarization. In these cases, the sum rules are deduced for the total probability to record a twisted photon and for the projection of the total angular momentum per photon. The explicit expressions for both incoherent and coherent interference factors are derived for several simple bunch profiles. *

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“…In recent years with the development of ultra-intense multi-PW laser technology, Laguerre-Gaussian laser modes have other potential applications in the fields of plasma accelerators, inertial confinement fusion and in the generation of X-rays and γ-rays with OAM [7][8][9][10][11][12][13][14]. In particular, it has been shown that in laser wakefields driven by LG 01 helical pulses, the wakefield shows a donut-like structure with a ring-shaped hollow electron beam [14].…”

Section: Introductionmentioning

confidence: 99%

Optimizing direct laser-driven electron acceleration and energy gain at ELI-NP

2020

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A detailed study of direct laser-driven electron acceleration in paraxial Laguerre-Gaussian modes corresponding to helical beams LG0m with azimuthal modes m = {1, 2, 3, 4, 5} is presented. Due to the difference between the ponderomotive force of the fundamental Gaussian beam LG00 and helical beams LG0m we found that the optimal beam waist leading to the most energetic electrons at full width at half maximum is more than twice smaller for the latter and corresponds to a few wavelengths ∆w0 = {6, 11, 19} λ0 for laser powers of P0 = {0.1, 1, 10} PW. Using these optimal values we have observed that the average kinetic energy gain of electrons is about an order of magnitude larger in helical beams compared to the fundamental Gaussian beam. This average energy gain increases with the azimuthal index m leading to collimated electrons of a few 100 MeV energy in the direction of the laser propagation.

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Manipulating the topological structure of ultrarelativistic electron beams using Laguerre–Gaussian laser pulse

Cited by 43 publications

References 48 publications

Probability of radiation of twisted photons in an inhomogeneous isotropic dispersive medium

Probability of radiation of twisted photons in an inhomogeneous isotropic dispersive medium

Probability of radiation of twisted photons by cold relativistic particle bunches

Optimizing direct laser-driven electron acceleration and energy gain at ELI-NP

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