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A list of all the posts and pages found on the site. For you robots out there is an XML version available for digesting as well.
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Posts
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posters
programming
QUVAC: quantum vacuum signal calculator Permalink
Quvac (from quantum vacuum, pronounced as qu-ack 🐸) allows to calculate quantum vacuum signals produced during light-by-light scattering. It uses linear Maxwell equations to describe the evolution of background electromagnetic fields and vacuum emission picture to calculate the transition amplitudes. It contains a lot of nice utilities supporting the research process (e.g. Bayesian optimization and simulations on a cluster).
Predict spatial laser jitter with neural networks Permalink
A number of helper classes for time-series laser jitter data pre-processing and model training/inference. Models could be trained on temporal or spectral (Short Time Fourier Transform) features. Open repository contains only the initial study with RNNs, current approach uses probabilistic time-series forecasting models (e.g. Autoformer).
Bayesian optimization framework for vacuum emission code Permalink
Optimization of light-by-light scattering scenarios using existing Vacuum Emission solver. It provides some helpful functions to run gridscan simulations and optuna optimizations.
Calculation of Thomson emission spectra based on electron’s trajectory Permalink
The electron’s trajectory is calculated via classical equations of motion. The emitted Thomson spectra is calculated with FFTs for a given electron trajectory.
publications
Back-reflection in dipole fields and beyond
Published in paper, 1900
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Towards a vacuum birefringence experiment at the Helmholtz International Beamline for Extreme Fields (Letter of Intent of the BIREF@ HIBEF Collaboration)
Published in paper, 1900
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Proof-of-principle experiment for the dark-field detection concept for measuring vacuum birefringence
Published in paper, 1900
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Numerical optimization of quantum vacuum signals
Published in paper, 1900
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Towards high photon density for Compton scattering by spectral chirp
Published in paper, 1900
Abstract:
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Signatures of the carrier envelope phase in nonlinear Thomson scattering
Published in paper, 1900
Abstract:
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On the usage of tapered undulators in the measurement of interference in the intensity-dependent electron mass shift
Published in paper, 1900
Abstract:
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Polarisation gating technique in nonlinear Compton scattering: effect of radiation friction and electron beam nonideality
Published in paper, 1900
Abstract:
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Narrow bandwidth gamma comb from nonlinear Compton scattering using the polarization gating technique
Published in paper, 1900
Abstract:
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research
Quantum vacuum
Numerical study of light-by-light scattering scenarios
Strong-field QED predicts that in the presence of strong electromagnetic fields the quantum vacuum starts to behave like a medium and affects light propagation. Due to this nonlinear interaction, the incoming photon might change its direction, energy and polarization. For currently achievable laser intensities the effect is really small and presents a huge experimental challenge.
Thomson/Compton scattering
Development of Thomson/Compton photon sources
The scattering of intense laser pulses on high-energy electron beams is a well-established method for generating x and γ radiation with applications in medicine, ultrafast radiography, and nuclear physics. Small intensities of an incident laser pulse lead to meager photon yields. Increasing laser intensity helps to boost photon yields, but also brings nonlinear effects into play, i.e., the spectrum is redshifted and high harmonics are generated. For temporally pulsed lasers, it also leads to a significant spectral ponderomotive broadening, which severely limits practical applications of such source.