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Compression of a Runaway Electron Flow in an Air Gap with a Nonuniform Magnetic Field

  • PLASMA, HYDRO- AND GAS DYNAMICS
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The first results of study of the compression of a picosecond runaway electron flow in an air electrode gap by a pulsed guiding magnetic field increasing along the electron trajectory by a factor of 10–20 are reported. The main aim is to increase the density and homogeneity of the current of runaway electrons that are generated near the edge of a tubular cathode and are accelerated in an inhomogeneous electric field to a collector inside a solenoid. Restrictions on the integral current of runaway electrons caused by the reflection of particles with high transverse velocities from a region of concentration of magnetic field lines (magnetic mirror) have been analyzed. Under “optimal” conditions (magnetic field, the diameter of the cathode, and its position with respect to the solenoid are varied), a magnetized tubular runaway electron flow radially compressed by a factor of 3–4 with a current density up to 100 А/cm2 is formed.

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ACKNOWLEDGMENTS

We are grateful to the Department of Electrophysics, Ural Federal University, for access to a Tektronix DPO73304D oscilloscope. The experiments were performed on the equipment of the Shared Use Center, Institute of Electrophysics, Ural Branch, Russian Academy of Sciences.

Funding

This work was supported in part by the Russian Foundation for Basic Research (project no. 19-08-00292 (experiment) and no. 20-08-00172 (theory)).

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Authors and Affiliations

  1. Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, 620016, Yekaterinburg, Russia

    M. A. Gashkov, N. M. Zubarev, O. V. Zubareva, G. A. Mesyats, K. A. Sharypov, V. G. Shpak, S. A. Shunailov & M. I. Yalandin

  2. Lebedev Physical Institute, Russian Academy of Sciences, 119991, Moscow, Russia

    N. M. Zubarev, G. A. Mesyats & M. I. Yalandin

Authors
  1. M. A. Gashkov
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  2. N. M. Zubarev
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  3. O. V. Zubareva
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  4. G. A. Mesyats
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  5. K. A. Sharypov
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  6. V. G. Shpak
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  7. S. A. Shunailov
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  8. M. I. Yalandin
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Correspondence to N. M. Zubarev.

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Translated by R. Tyapaev

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Gashkov, M.A., Zubarev, N.M., Zubareva, O.V. et al. Compression of a Runaway Electron Flow in an Air Gap with a Nonuniform Magnetic Field. Jetp Lett. 113, 370–377 (2021). https://doi.org/10.1134/S0021364021060059

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  • DOI: https://doi.org/10.1134/S0021364021060059

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