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Participant |
Tamburini, Matteo | |||||||
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Institution |
Max-Planck-Institut für Kernphysik - Saupfercheckweg 1 - Heidelberg - Baden-Württemberg - Germany | |||||||
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Session |
SF1 |
Accepted |
Yes |
Order |
4 |
Time |
16:15 | 15' |
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Talk |
Oral abstract |
Title |
Giant Collimated Gamma-Ray Flashes | |||||
| Coauthors | Tamburini, Matteo; Benedetti, Alberto; Keitel, Christoph H. | |||||||
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Abstract |
Electromagnetic instabilities with the self-generation of strong electromagnetic fields are ubiquitous in astrophysics. Here we show that astrophysical-like sources of high-energy synchrotron radiation can be recreated in the laboratory. In fact, when a dense ultra-relativistic electron beam interacts with a millimetre thickness solid conductor electromagnetic instabilities develop, and the ultra-relativistic electrons travel through self-generated electromagnetic fields as large as 10^7 - 10^8 gauss. This results into the production of a collimated gamma-ray pulse with peak brilliance above 10^25 photons s^-1 mrad^-2 mm^-2 per 0.1% bandwidth, photon energies ranging from 200 keV to GeV, and up to 60% electron-to-photon energy conversion efficiency. In addition to their intrinsic interest for reproducing astrophysical phenomena in the laboratory, these findings pave the way to novel investigations in strong-field QED and nuclear physics such as the interaction between real photons in vacuum. |
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Pdf file |
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Session |
SF1 |
Accepted |
Yes |
Order |
5 |
Time |
16:30 | 15' |
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Talk |
Oral abstract |
Title |
Implementing Nonlinear Compton Scattering Beyond The Local Constant Field Approximation | |||||
| Coauthors | Tamburini, Matteo; Di Piazza, Antonino; Meuren, Sebastian; Keitel, Christoph H. | |||||||
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Abstract |
In the calculation of probabilities of physical processes occurring in a background classical field, the local constant field approximation (LCFA) relies on the possibility of neglecting the space-time variation of the external field within the region of formation of the process. This approximation is widely employed in strong-field QED as it allows to evaluate probabilities of processes occurring in arbitrary electromagnetic fields starting from the corresponding quantities computed in a constant electromagnetic field. We demonstrate that the LCFA is quantitatively and qualitatively insufficient for describing the low-energy part of the emitted photon probability. In addition, we provide a simple recipe to implement an improved expression of the photon emission probability beyond the LCFA in numerical codes, which are an essential tool to interpret present and upcoming experiments in strong-field QED aiming at reproducing the extreme conditions of astrophysical environments with high-power lasers. |
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Pdf file |
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