Positron Production by Runaway Electrons in Lorentzian Plasmas
Shalenov E.O. Myrzali M.A. Seitkozhanov Y.S. Dzhumagulova K.N. Masheyeva R.U. Jumagulov M.N.
November 2025Multidisciplinary Digital Publishing Institute (MDPI)
Symmetry
2025#17Issue 11
We study electron–positron pair production by runaway electrons in fusion plasmas. The analysis uses a Coulomb logarithm derived for a Lorentzian plasma, which captures the high-energy “tail” in the non-Maxwellian runaway-electron distribution (κ-distribution). The Coulomb logarithm decreases as the distribution departs further from a Maxwellian. A lower kappa (κ) therefore reduces the Coulomb logarithm and yields a faster decline of the differential positron generation rate with increasing electron energy. Future work will explore how the electron–positron charge asymmetry manifests in their synchrotron radiation.
Coulomb logarithm , Lorentzian plasmas , positron , runaway electrons , tokamak research
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Department of General Physics, Satbayev University, Almaty, 050013, Kazakhstan
Institute of Experimental and Theoretical Physics, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Department of Plasma Physics, Nanotechnology and Computer Physics, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Department of Science and Innovation, Kazakh-British Technical University, Almaty, 050005, Kazakhstan
HUN REN Wigner Research Center for Physics, Budapest, 1121, Hungary
Department of General Physics
Institute of Experimental and Theoretical Physics
Department of Plasma Physics
Department of Science and Innovation
HUN REN Wigner Research Center for Physics
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