Pulse envelope effects in nonlinear Breit-Wheeler pair creation

Tang, Suo; King, B.

doi:10.1103/physrevd.104.096019

Cited by 21 publications

(34 citation statements)

References 121 publications

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“…In some such cases, observables can be defined as limits of those in sandwich waves, but in other cases not. Amplitudes in a monochromatic (hence exactly periodic) background, for example, can be recovered from those in 'wavetrain' backgrounds containing a finite number of cycles, in the limit where the number of cycles is taken to infinity [151,152,153]. (Working directly in the monochromatic limit allows for alternative physical interpretations, see e.g.…”

Section: Quantum Dynamicsmentioning

confidence: 99%

Advances in QED with intense background fields

Fedotov¹,

Ilderton²,

Karbstein³

et al. 2022

Preprint

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Upcoming and planned experiments combining increasingly intense lasers and energetic particle beams will access new regimes of nonlinear, relativistic, quantum effects. This improved experimental capability has driven substantial progress in QED in intense background fields. We review here the advances made during the last decade, with a focus on theory and phenomenology. As ever higher intensities are reached, it becomes necessary to consider processes at higher orders in both the number of scattered particles and the number of loops, and to account for non-perturbative physics (e.g. the Schwinger effect), with extreme intensities requiring resummation of the loop expansion. In addition to increased intensity, experiments will reach higher accuracy, and these improvements are being matched by developments in theory such as in approximation frameworks, the description of finite-size effects, and the range of physical phenomena analysed. Topics on which there has been substantial progress include: radiation reaction, spin and polarisation, nonlinear quantum vacuum effects and connections to other fields including physics beyond the Standard Model.

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Section: Quantum Dynamicsmentioning

confidence: 99%

Advances in QED with intense background fields

Fedotov¹,

Ilderton²,

Karbstein³

et al. 2022

Preprint

Self Cite

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“…One reason for this, which can be seen in the logarithmic plot (middle row), is that the QED result includes the linear Breit-Wheeler signal, which, being due to interference on the length scale of the pulse envelope, is missed by the LMA. The linear Breit-Wheeler signal has the effect of suppressing the rapid decay of the spectrum at larger values of s [116]. This disagreement between simulation and theory, whilst large, is occurring in a region which does not contribute significantly to the total probability of the process.…”

Section: Focused Lasersmentioning

confidence: 93%

“…The error in the LMA is largest at η = 2 because the full QED result can already access the first harmonic (due to the finite bandwidth of the envelope), whereas for η < 2.08, the LMA is essentially 'blind' to the first harmonic. (See also [116], which analyses pulse envelope effects on harmonic transitions in more detail.) Also visible in Fig.…”

Section: Lightfront Momentum Spectramentioning

confidence: 99%

“…3, that (ξ, η, N ) ≈ (0.5, 0.2, 16) is the point at which the LMA started to diverge from QED due to the linear Breit-Wheeler effect for the parameters we have chosen. Since linear Breit-Wheeler has a wider momentum spectrum [116], and since at ξ = 0.5, the spectrum is heavily suppressed at values of momentum in the 'tails', if s is far enough from the centre at s = 1/2, the linear Breit-Wheeler contribution will dominate. This explains the large increase in the error in Fig.…”

Section: Lightfront Momentum Spectramentioning

confidence: 99%

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Higher fidelity simulations of nonlinear Breit–Wheeler pair creation in intense laser pulses

Blackburn

King

2022

Eur. Phys. J. C

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When a photon collides with a laser pulse, an electron-positron pair can be produced via the nonlinear Breit–Wheeler process. A simulation framework has been developed to calculate this process, which is based on a ponderomotive approach that includes strong-field quantum electrodynamical effects via the locally monochromatic approximation (LMA). Here we compare simulation predictions for a variety of observables, in different physical regimes, with numerical evaluation of exact analytical results from theory. For the case of a focussed laser background, we also compare simulation with a high-energy theory approximation. These comparisons are used to quantify the accuracy of the simulation approach in calculating harmonic structure, which appears in the lightfront momentum and angular spectra of outgoing particles, and the transition from multi-photon to all-order pair creation. Calculation of the total yield of pairs over a range of intensity parameters is also used to assess the accuracy of the locally constant field approximation (LCFA).

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“…Clearly, as the high-intensity lasers involved in the listed collaborations (I O(10 22 ) Wcm −2 ) are tightly focussed and the production of γ quanta through bremsstrahlung generates a broad spectrum, attempts in describing theoretically the forthcoming measurements require to go beyond the traditional treatments of pair production by a monoenergetic γ beam and a plane-wave laser field, on which most of the investigations carried out so far rely [3][4][5][6][7][16][17][18][19][20][21][22][23][24][25][26][27][28]. This situation renders theoretical studies of the strong field pair production process in realistic setups a subject of raising interest.…”

Section: Introductionmentioning

confidence: 99%

Non-linear Breit-Wheeler pair production in collisions of bremsstrahlung $γ-$quanta and a tightly focussed laser pulse

Golub,

Villalba-Chávez,

Müller

2022

Preprint

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Experimental efforts toward the detection of the nonperturbative strong-field regime of the Breit-Wheeler pair creation process plan to combine incoherent sources of GeV γ quanta and the coherent fields of tightly focussed optical laser pulses. This endeavour calls for a theoretical understanding of how the pair yields depend on the applied laser field profile. We provide estimates for the number of produced pairs in a setup where the high-energy radiation is generated via bremsstrahlung. Attention is paid to the role of the transversal and longitudinal focussing of the laser field, along with the incorporation of a Gaussian pulse envelope. We compare our corresponding results with predictions from plane-wave models and determine the parameters of focused laser pulses which maximize the pair yield at fixed pulse energy. Besides, the impact of various super-Gaussian profiles for the laser pulse envelope and its transverse shape is discussed.

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Pulse envelope effects in nonlinear Breit-Wheeler pair creation

Cited by 21 publications

References 121 publications

Advances in QED with intense background fields

Advances in QED with intense background fields

Higher fidelity simulations of nonlinear Breit–Wheeler pair creation in intense laser pulses

Non-linear Breit-Wheeler pair production in collisions of bremsstrahlung $γ-$quanta and a tightly focussed laser pulse

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