Radiation reaction of betatron oscillation in plasma wakefield accelerators

Zeng, Ming; Seto, Keita

doi:10.1088/1367-2630/ac12fa

Cited by 7 publications

(9 citation statements)

References 39 publications

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“…(31) -(33) dominate. These terms were previously proposed [22], but the betatron phase shift is found for the first time in the present work.…”

Section: The Long-term Equations Of 3d Betatron Oscillationmentioning

confidence: 52%

“…As it has been discussed in Ref. [22] and [23], this classical RR model is valid as long as rγr e /2α 1, where α is the fine structure constant.…”

mentioning

confidence: 90%

“…The BO in a plasma accelerator is another good case for such long interaction time. The radiation leads to the energy loss of electrons and in return affects the energy-dependent betatron frequency, as well as the other beam properties, such as the energy spread and emittance [16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Modeling of three-dimensional betatron oscillation and radiation reaction in plasma accelerators

Liu¹,

Zhang²

2022

Preprint

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Betatron oscillation is a commonly known phenomenon in laser or beam driven plasma wakefield accelerators. In the conventional model, the plasma wake provides a linear focusing force to a relativistic electron, and the electron oscillates in one transverse direction with the betatron frequency proportional to 1/ √ γ, where γ is the Lorentz factor of the electron. In this work, we extend this model to three-dimensional by considering the oscillation in two transverse and one longitudinal directions. The long-term equations, with motion in the betatron time scale averaged out, are obtained and compared with the original equations by numerical methods. In addition to the longitudinal and transverse damping due to radiation reaction which has been found before, we show phenomena including the longitudinal phase drift, betatron phase shift and betatron polarization change based on our long-term equations. This work can be highly valuable for future plasma based high-energy accelerators and colliders.

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“…(31) -(33) dominate. These terms were previously proposed [22], but the betatron phase shift is found for the first time in the present work.…”

Section: The Long-term Equations Of 3d Betatron Oscillationmentioning

confidence: 52%

“…As it has been discussed in Ref. [22] and [23], this classical RR model is valid as long as rγr e /2α 1, where α is the fine structure constant.…”

mentioning

confidence: 90%

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Modeling of three-dimensional betatron oscillation and radiation reaction in plasma accelerators

Liu¹,

Zhang²

2022

Preprint

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“…In a plasma wakefield, in addition to the longitudinal accelerating force, the transverse focusing force acts on the electron, causing transverse betatron oscillations of the particle. An electron moving along a curvilinear trajectory emits electromagnetic (EM) waves, which leads to radiative losses, thereby reducing acceleration effectiveness [5][6][7][8]. With typical parameters available in modern plasma acceleration experiments, the radiative losses are usually negligible.…”

Section: Introductionmentioning

confidence: 99%

Radiation reaction-dominated regime of wakefield acceleration

2022

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We study electron acceleration in a plasma wakefield under the influence of the radiation-reaction force caused by the transverse betatron oscillations of the electron in the wakefield. Both the classical and the strong quantum-electrodynamic (QED) limits of the continuous radiation reaction are considered. For the constant accelerating force, we show that the amplitude of the oscillations of the QED parameter χ in the radiation-dominated regime reaches an equilibrium value determined only by the magnitude of the accelerating field, while the averaged over betatron oscillations radiation reaction force saturates at a value smaller than the accelerating force and thus is incapable of stopping acceleration. We find the parameters of the electron bunch and the plasma accelerator for which reaching such a regime is possible. We also study effects of the dephasing and the corresponding change of the accelerating force over the course of acceleration and conclude that the radiation-dominated regime is realized both in cases of single-stage acceleration with slow dephasing (usually corresponding to bunch-driven plasma accelerators) and multi-stage acceleration with fast dephasing (corresponding to the use of laser-driven accelerators).

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“…The 24-hour stable LWFA has been achieved by decoding sources of energy drift and jitter [4]. Improving the output beam quality parameters including the energy spread, the beam charge, the emittance, the energy stability and so on has been a long-term goal in this society for the high-demanding applications such as plasma based light sources and colliders [5][6][7][8].…”

mentioning

confidence: 99%

Scissor-cross ionization injection in laser wakefield accelerators

Wang,

Zeng,

Wang

et al. 2021

Preprint

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We propose to use a frequency doubled pulse colliding with the driving pulse at an acute angle to trigger ionization injection in a laser wakefield accelerator. This scheme effectively reduces the duration that injection occurs, thus high injection quality is obtained. Three-dimensional particlein-cell simulations show that electron beams with energy of ∼ 500 MeV, charge of ∼ 40 pC, energy spread of ∼ 1% and normalized emittance of a few millimeter milliradian can be produced by ∼ 100 TW laser pulses. By adjusting the angle between the two pulses, the intensity of the trigger pulse and the gas dope ratio, the charge and energy spread of the electron beam can be controlled.

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Radiation reaction of betatron oscillation in plasma wakefield accelerators

Cited by 7 publications

References 39 publications

Modeling of three-dimensional betatron oscillation and radiation reaction in plasma accelerators

Modeling of three-dimensional betatron oscillation and radiation reaction in plasma accelerators

Radiation reaction-dominated regime of wakefield acceleration

Scissor-cross ionization injection in laser wakefield accelerators

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