Retreat FOR2783




Carsten Müller (Uni Düsseldorf)

Retreat FOR2783

Retreat FOR2783
  • Alexandra Eckey
  • Alina Golub
  • Andreas Lindner
  • Andreas Seidel
  • Annika Tamara Schmitt
  • Baris Ölmez
  • Bin Liu
  • Carsten Müller
  • Chantal Sundqvist
  • Christian Bild
  • Daniel Seipt
  • Elena Mosman
  • Felipe Salgado
  • Felix Karbstein
  • Hartmut Ruhl
  • Holger Gies
  • Kai S. Schulze
  • Katinka von Grafenstein
  • Leonard Doyle
  • Leonhard Klar
  • Pooyan Khademi
  • Ricardo Oude Weernink
  • Samah Balouza
  • Selym Villalba
  • Yukiko Song
    • 1:00 PM 2:30 PM
      Block: E1, T1, T2
      • 1:00 PM
        Quantum Vacuum Simulation Algorithm and Code (QVSP) 30m

        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.

        Speakers: Baris Ölmez, Andreas Maximilian Lindner (LMU Munich)
      • 1:30 PM
        Vacuum birefringence and diffraction at XFEL: from analytical estimates to optimal parameters 30m

        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 allow for quantitatively accurate results on the one-percent level. We in particular demonstrate that an appropriate choice of the x-ray focus and pulse duration can significantly improve the signal for given laser parameters, using the experimental parameters to be available at the Helmholtz International Beamline for Extreme Fields at the European XFEL as example.

        Speaker: Elena Mosman (Tomsk Polytechnic University)
      • 2:00 PM
        Numerical Simulation of Colliding Laser Pulses 30m

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

        Speakers: Andreas Maximilian Lindner (LMU Munich), Baris Ölmez
    • 2:30 PM 3:00 PM
      Break: Coffee and discussions
    • 3:00 PM 4:30 PM
      Block: T1, T2, E2
      • 3:00 PM
        Photon merging in the collision of two laser pulses 30m

        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 this talk, results on the emission characteristics of the merged signal photons will be presented, demonstrating that the availability of just two laser beams is sufficient to achieve a sizable signal in experiments with state-of-the-art technology.

        Speaker: Chantal Sundqvist (FSU Jena)
      • 3:30 PM
        Experiments at the JETI laser 30m

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

        Speaker: Mr Pooyan Khademi
      • 4:00 PM
        First measurement of background signals 30m

        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.

        Speaker: Mr Leonard Doyle (LMU)
    • 4:30 PM 5:00 PM
      Break: Coffee and discussions
    • 5:00 PM 6:00 PM
  • Wednesday, April 28