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Editorial: 16th IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems—Theory of Plasma Instabilities

The papers of this Special Issue of Nuclear Fusion are based on the presentations made at the 16th IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems—Theory of Plasma Instabilities (EPPI 2019) hosted by National Institute for Fusion Science in Shizuoka, Japan, 3–6 September 2019. A total of 96 participants from 15 countries and 2 international organizations made presentations on the most recent advances in research on energetic particle physics and multiscale physics of magnetically confined plasmas, with 14 Invited presentations, 22 oral presentations, 57 poster presentations, and 2 summary presentations.Theconfinement of energetic particles is one of the most important issues in fusion research because energetic particles, especially energetic alpha particles born from the D–T reaction, play an essential role in heating plasma to the extremely high temperature required for fusion reactions. In addition, due to the self-organizing nature of burning plasma, alpha particles require careful investigation for various multiscale phenomena before the burning plasma experiments.Inorderto predict the characteristics of the burning plasma, many experiments have been conducted for various problems in the field of magnetic confinement fusion. However, it is generally impossible to set completely the same physical conditions as the burning plasma. The appropriate approach to the prediction of the burning plasma is the elucidation of the physical mechanisms underlying the various phenomena and the development of theoretical models and simulations that are validated with the experimental data on the present devices. The EPPI 2019 was formed with the merging of two series of previous technical meetings on energetic particles in magnetic confinement systems and theory of plasma instabilities. The EPPI 2019 provided a forum not only for the presentations on the latest research results, but also for discussions to understand the underlying physics of various experimental results and to promote collaborative research among experiment, theory, and simulation toward the prediction of the