Retreat FOR2783

Liste der Beiträge

21. Quantum Vacuum Simulation Algorithm and Code (QVSP)

Baris Ölmez, Andreas Maximilian Lindner (LMU Munich)

27.04.21, 13:00

Block

A numerical scheme for solving the nonlinear Heisenberg-Euler equation in up to 3 spatial dimensions plus time is derived and its properties are discussed. This "quantum vacuum simulation algorithm" is tested against a set of already known analytical results and its power to go beyond analytically solvable scenarios is shown.

22. Vacuum birefringence and diffraction at XFEL: from analytical estimates to optimal parameters

Elena Mosman (Tomsk Polytechnic University)

27.04.21, 13:30

Block

We study vacuum birefringence and x-ray photon scattering in the head-on collision of x-ray free electron and high-intensity laser pulses. Resorting to analytical approximations for the numbers of attainable signal photons, we analyze the behavior of the phenomenon under the variation of various experimental key-parameters and provide new analytical scalings. Our optimized approximations...

28. Numerical Simulation of Colliding Laser Pulses

Andreas Maximilian Lindner (LMU Munich), Baris Ölmez

27.04.21, 14:00

Block

The nonlinear optical properties of colliding high field laser pulses in HE weak field approximation is investigated numerically. The numerical approach is detailed.

20. Photon merging in the collision of two laser pulses

Chantal Sundqvist (FSU Jena)

27.04.21, 15:00

Block

Quantum vacuum nonlinearity allows for the effect of laser photon merging in the collision of two (or more) laser beams. As the merged photons origin from a manifestly inelastic process, their energy differs significantly from the background photons of the driving lasers, making them accessible for experiments. However, the number of merged photons is typically considered to be very small.
In...

29. Experiments at the JETI laser

Herr Pooyan Khademi

27.04.21, 15:30

Block

First strong field experiments at the JETI super laser in Jena are reported.

19. First measurement of background signals

Herr Leonard Doyle (LMU)

27.04.21, 16:00

Block

In August 2020, a first experimental campaign was conducted to investigate light scattered from a single laser focus in vacuum. Any photons measured constitute an undesired background signal for an actual multi-beam collision experiment. Key findings will be presented and possible improvements as well as the expected scaling towards higher power collision experiments will be discussed.

24. Signatures of quantum vacuum non-linearity in laser-pulse collisions at finite focal offsets

Ricardo Oude Weernink (Helmholtz Institute Jena / FSU Jena)

28.04.21, 09:00

Block

We study optical signatures of two-photon scattering processes by collision of two Gaussian beams. Effects on the signal photon distribution by focal shifts are observed for an XFEL probe and an optical pump while taking the beams' curvatures into account.

27. Radiation Reaction and Emergent Inertia in Strong Electromagnetic Fields

Herr Christian Bild (LMU)

28.04.21, 09:30

Block

Inertia in strong electromagnetic fields is an emergent quantity. The way to show this is with the help of a new approach to radiation reaction. Hence, we first review radiation reaction and explain what the concept of emergent inertia is.

25. Nonlinear Breit-Wheeler pair production: effects of laser focusing

Alina Golub (Heinrich-Heine-Universität Düsseldorf)

28.04.21, 10:00

Block

A discussion about effects of focusing on nonperturbative pair production rate when considering laser and bremsstrahlung photons

23. Latest results on fluid dynamic simulations for new laser wakefield acceleration targets

Andreas Seidel

28.04.21, 11:00

Block

26. Detector development for diagnosing single particles at strong-field QED experiments

Felipe Salgado (FSU Jena / Helmholtz-Institut Jena)

28.04.21, 11:30

Block

A detection particle system composed of LYSO scintillating screens and a Cherenkov calorimeter is proposed for diagnosing single electron-positron pairs created due to the nonlinear Breit-Wheeler process. Moreover, Monte-Carlo simulations to estimate the signal-to-noise ratio of the detectors are presented.

30. Electrons from elongated tragetts with up to GeV energies

Frau Katinka von Grafenstein (Ludwig-Maximilians-Universität München)

28.04.21, 13:00

Block

First experiments are reported that show electrons with up to GeV energies.

18. Quantum Meanfield Theory with Feedback

Yukiko Song (Chair Ruhl, LMU)

28.04.21, 13:30

Block

Renormalisation method for pair creation with feedback in time-dependent electric fields.

31. Radiation Reaction in Classical Electrodynamics

Christian Bild (LMU)

In this talk a new radiation reaction force is given. First, the Diracs derivation of the LAD-force is analysed. An unjustified employment of a Taylor series is identified as the cause of run away solutions. Next, an approach by Parrott to circumvent the Taylor Series is discussed. An additional geometric constrained is introduced, which is violated by Parrott's derivation. Finally, a new...