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No Access Submitted: 12 October 2018 Accepted: 21 December 2018 Published Online: 14 January 2019

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

Physics of Plasmas 26, 013105 (2019); https://doi.org/10.1063/1.5066109
T. Wang1,2, T. Toncian3, M. S. Wei4, and A. V. Arefiev1,2
more...View AffiliationsView Contributors
  • T. Wang
  • T. Toncian
  • M. S. Wei
  • A. V. Arefiev
ABSTRACT
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 x-ray free electron laser for the detection of the magnetic field via the Faraday rotation. Post-processed three dimensional 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 focusing the laser pulse driving the magnetic field. We predict that the Faraday rotation can produce 103 photons with polarization orthogonal to the polarization of the incoming 100 fs long probe beam with 5 × 1012 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.

ACKNOWLEDGMENTS

This research was supported by the Air Force Office of Scientific Research under Grant No. FA9550-17-1-0382 and the National Science Foundation under Grant No. 1632777. Particle-in-cell simulations were performed using EPOCH3737. T. Arber, K. Bennett, C. Brady, A. Lawrence-Douglas, M. Ramsay, N. Sircombe, P. Gillies, R. Evans, H. Schmitz, A. Bell et al., “Contemporary particle-in-cell approach to laser-plasma modelling,” Plasma Phys. Controlled Fusion 57(11), 113001 (2015). https://doi.org/10.1088/0741-3335/57/11/113001 and developed under UK EPSRC Grant Nos. EP/G054940, EP/G055165, and EP/G056803. High performance computing resources were provided by the Texas Advanced Computing Center (TACC) at The University of Texas at Austin and by the Extreme Science and Engineering Discovery Environment (XSEDE) through allocation PHY180033. Data collaboration was supported by the SeedMe2 project3838. D. N. A. Chourasia and M. Norman, “Seedme: Data sharing building blocks,” in Proceedings of the Practice and Experience in Advanced Research Computing 2017 on Sustainability, Success and Impact (PEARC17) (2017), Vol. 69, p. 1. (http://dibbs.seedme.org).

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  1. © 2019 Author(s). Published under license by AIP Publishing.

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