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P: Fachverband Plasmaphysik

P 8: Laser Plasmas I - Codes and Modelling I

P 8.3: Vortrag

Dienstag, 19. März 2019, 11:30–11:45, HS 20

Probing the strong-field frontier of quantum electrodynamics — •Christoph Baumann and Alexander Pukhov — Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf

The success of QED is related to its very precise predictions that are in excellent agreement with experimental data. However, according to Ritus and Narozhny [1] and recently revisited by Fedotov [2], perturbative strong-field QED is conjectured to break down at αχ^2/3≃ 1, thus entering a novel and fully non-perturbative regime of QED for which no reliable theoretical calculations exist so far. Regarding ultra-fast radiation losses in such an extreme environment, this regime is thought to be out of experimental reach. Using the QED-PIC code VLPL [3], the present contribution, however, proposes several setups that might be promising for probing this exotic regime in the not too distant future. All setups have in common that the switching time of the strong background field is significantly shortened to reduce radiation losses. This can be done, for instance, by the collision of two high-current, tightly focused and tightly compressed electron beams [4], by the conversion of an optical laser pulse to an ultra-intense attosecond pulse [5] or by using the fact that the penetration depth in laser-solid interactions is limited to the skin depth [6].

[1] V. I. Ritus, Ann. Phys. 69, 555 (1972); N. B. Narozhny, Phys. Rev. D 21, 1176 (1980); [2] A. Fedotov, J. Phys.: Conf. Ser. 826, 012027 (2017); [3] C. Baumann et al., Phys. Rev. E 94, 063204 (2016); [4] V. Yakimenko et al., arXiv:1807.09271 (2018); [5] C. Baumann et al., arXiv:1811.03990 (2018); [6] C. Baumann et al., in preparation (2018)