High-Precision X-Ray Polarimetry

Marx, B.; Schulze, K. S.; Uschmann, I.; Kämpfer, T.; Lötzsch, Robert; Wehrhan, O.; Wagner, W.; Detlefs, C.; Roth, Thomas; Härtwig, J.; Förster, E.; Stöhlker, Th.; Paulus, G. G.

doi:10.1103/physrevlett.110.254801

Cited by 91 publications

(77 citation statements)

References 20 publications

(23 reference statements)

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“…The principle scheme of a vacuum birefringence experiment employing a high-intensity laser field to polarize the quantum vacuum was put forward in [39], envisioning the combination of an optical high-intensity laser pulse as pump and a bright linearly polarized x-ray pulse as probe. As the birefringence-induced signal is inversely proportional to the wavelength of the probe and directly proportional to the number of photons available for probing, x-ray probes seem most promising, particularly given the tremendous progress in x-ray polarization purity measurements achieved in recent years [40,41]. An experiment of this type will become possible, for example, at the Helmholtz International Beamline for Extreme Fields (HIBEF) at the European x-ray free-electron laser (XFEL).…”

Section: Probing Vacuum Birefringence With High-intensity Lasersmentioning

confidence: 99%

High magnetic fields for fundamental physics

et al. 2018

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Various fundamental-physics experiments such as measurement of the birefringence of the vacuum, searches for ultralight dark matter (e.g., axions), and precision spectroscopy of complex systems (including exotic atoms containing antimatter constituents) are enabled by high-field magnets. We give an overview of current and future experiments and discuss the state-of-the-art DCand pulsed-magnet technologies and prospects for future developments. * Electronic address: budker@uni-mainz.de †

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Section: Probing Vacuum Birefringence With High-intensity Lasersmentioning

confidence: 99%

High magnetic fields for fundamental physics

et al. 2018

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“…The polarization purity for the European XFEL is expected satisfy the condition (11) by employing a polarimetry setup similar to that discussed in Ref. [36]. The results presented in this section of the manuscript should be viewed as an upper estimate for the number of detectable photons, denoted as N out .…”

Section: Synthetic Diagnostic For Faraday Rotation Of An X-ray Probe mentioning

confidence: 87%

Structured targets for detection of Megatesla-level magnetic fields through Faraday rotation of XFEL beams

et al. 2019

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A solid density target irradiated by a high-intensity laser pulse can become relativistically transparent, which then allows it to sustain an extremely strong laser-driven longitudinal electron current. The current generates a filament with a slowly-varying MT-level azimuthal magnetic field that has been shown to prompt efficient emission of multi-MeV photons in the form of a collimated beam required for multiple applications. This work examines the feasibility of using an x-ray beam from the European XFEL for the detection of the magnetic field via the Faraday rotation. Post-processed 3D particle-in-cell simulations show that, even though the relativistic transparency dramatically reduces the rotation in a uniform target, the detrimental effect can be successfully reversed by employing a structured target containing a channel to achieve a rotation angle of 10 −4 rad. The channel must be relativistically transparent with an electron density that is lower than the near-solid density in the bulk. The detection setup has been optimized by varying the channel radius and the focusing of the laser pulse driving the magnetic field. We predict that the Faraday rotation can produce 10 3 photons with polarization orthogonal to the polarization of the incoming 100 fs long probe beam with 5 × 10 12 x-ray photons. Based on the calculated rotation angle, the polarization purity must be much better than 10 −8 in order to detect the signal above the noise level.

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“…For state-of-art PW-class lasers worldwide, the so-called extinction ratio of the outgoing radiation, defined as 10 · log 10 (P laser y /P ) dB, is typically in the range of −20 to −30 dB. However, recent developments have achieved extinction ratios ∼−100 dB for the polarization purity of x-ray sources [28]. Assuming that these improvements can be transferred to the optical domain, we can envisage a situation with P laser y /P ∼ 10 −10 .…”

Section: B Rotation Of Polarizationmentioning

confidence: 98%

Self-induced mode mixing of ultraintense lasers in vacuum

2014

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We study the effects of the quantum vacuum on the propagation of a Gaussian laser beam in vacuum. By means of a double perturbative expansion in paraxiality and quantum vacuum terms, we provide analytical expressions for the self-induced transverse mode mixing, rotation of polarization, and third harmonic generarion. We discuss the possibility of searching for the self-induced, spatially dependent phase shift of a multipetawatt laser pulse, which may allow the testing of quantum electrodynamics and new physics models, such as Born-Infeld theory and models involving new minicharged or axion-like particles, in parametric regions that have not yet been explored in laboratory experiments

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High-Precision X-Ray Polarimetry

Cited by 91 publications

References 20 publications

High magnetic fields for fundamental physics

High magnetic fields for fundamental physics

Structured targets for detection of Megatesla-level magnetic fields through Faraday rotation of XFEL beams

Self-induced mode mixing of ultraintense lasers in vacuum

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