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Felix Karbstein12.09.22, 14:00
Quantum field theory predicts the vacuum to exhibit a non-linear response to strong electromag- netic fields. This fundamental tenet has remained experimentally challenging and is yet to be tested in the laboratory. We present proof of concept and detailed theoretical analysis of an experimental setup for precision measurements of the quantum vacuum signal generated by the collision of a bril-...
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Willi Hippler12.09.22, 14:45
This was the topic of my Master thesis.
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I will discuss the limitations of the polarization purity in X-ray channelcut polarizers due to Umweganregungen. To reach polarization purities in the range of 10^(-12) or better, these Umweganregungen has to be avoided. This can be done by align the azimuthal angle of the crystal very precicely. I developed a new and faster method, based on the... -
Alexandra Eckey (Heinrich-Heine-University Düsseldorf)12.09.22, 16:00
Motivated by corresponding experimental prospects (such as E3 or LUXE at DESY) we study strong-field Breit-Wheeler pair production by bremsstrahlung gamma-rays propagating through a high-intensity optical laser wave. The influence of the broad frequency spectrum of the bremsstrahlung on the properties of the process in the transition region between the perturbative and the non-perturbative...
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Alina Golub (Heinrich-Heine-Universität Düsseldorf)12.09.22, 16:45
Current experimental efforts toward the detection of the nonperturbative nonlinear strong-field regime of Breit-Wheeler pair creation plan to combine incoherent sources of GeV $\gamma$ quanta and tightly focussed optical laser pulses. This endeavour calls for a theoretical understanding of how the pair yields depend on the applied laser field profile [1]. In the present discussion, we provide...
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Yukiko Song (Chair Ruhl, LMU)13.09.22, 09:15Electron-positron pair creation
In the paper Relativistic Quantum Transport Theory for
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Electrodynamics by Zhuang, Heinz et al. a complete set of kinetic
equations for the covariant equal-time formulation of the quantum
kinetic theory is derived. We expand on this theory by computing
numerical solutions for time-dependent electric fields in the Schwinger
approximation. Early results suggest an important role of the... -
Baris Ölmez13.09.22, 10:00Quantum vacuum nonlinearities in the all-optical regimeOral
The calculation of colliding laser pulses in the weak-field limit of the
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Heisenberg-Euler quantum vacuum up to three spatial dimensions is
carried out using our Heisenberg-Euler Weak-Field Expansion
Simulator (HEWES). With the aid of HEWES different scenarios
potentially relevant are investigated. -
Holger Gies (TPI, FSU Jena)13.09.22, 10:45Quantum vacuum nonlinearities in the all-optical regimeOral
I present results from a study of the collision of two optical laser pulses in a pump-probe setup using beams with circular and elliptic cross section and estimate the number of discernible signal photons induced by quantum vacuum nonlinearities. In this analysis we study strategies to optimize the quantum vacuum signal discernible from the background of the driving lasers. One of the main...
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Chantal Sundqvist (FSU Jena)13.09.22, 13:00Quantum vacuum nonlinearities in the all-optical regimeOral
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.
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In... -
Xinhe Huang13.09.22, 13:45
The LUXE (Laser Und XFEL Experiment) project at DESY Hamburg aims to measure processes in the strong-field quantum electrodynamics regime with high precision by colliding electrons or a high-energy photon beam with high-power, tightly focused laser beam at a repetition rate of 1Hz. Simulations [LUXE CDR, arXiv:2102.02032 [hep-ex]] predict that the probability of pair production responds highly...
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Herr Leonard Doyle (LMU)13.09.22, 14:30Quantum vacuum nonlinearities in the all-optical regimeOral
The studies conducted during the first funding period led to a proposed set-up for a discovery experiment of photon-photon scattering in CALA (Munich) using two colliding laser pulses at fundamental frequency. In this talk we will give an update on our current understanding of the physics involved in the signal as well as background noise and report on the status of the final experiment design.
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Felipe Salgado (FSU Jena / Helmholtz-Institut Jena)14.09.22, 09:15
Updates on the E3 experiment at CALA and the first background measurements with the single particle detectors.
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Katinka von Grafenstein (Ludwig-Maximilians-Universität)14.09.22, 10:00
We will present an update on project related preparatory studies at CALA.
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