Quasi-Periodic Mitigation of Runaway Electron Beam via Interaction with Kinetic Instabilities in the QUEST Spherical Tokamak

Thomas K. CLOAREC; Ryuya IKEZOE; Kazuaki HANADA; Makoto HASEGAWA; Hiroshi IDEI; Takeshi IDO; Toshiki KINOSHITA; Yoshihiko NAGASHIMA; Takumi ONCHI

doi:10.1585/pfr.21.1202010

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Quasi-Periodic Mitigation of Runaway Electron Beam via Interaction with Kinetic Instabilities in the QUEST Spherical Tokamak

Thomas K. CLOAREC, Ryuya IKEZOE, Kazuaki HANADA, Makoto HASEGAWA, Hiroshi IDEI, Takeshi IDO, Toshiki KINOSHITA, Yoshihiko NAGASHIMA, Takumi ONCHI

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Keywords: runaway electron, kinetic instability, current quench, RE mitigation, spherical tokamak

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2026 Volume 21 Article ID: 1202010

DOI https://doi.org/10.1585/pfr.21.1202010

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Abstract

Runaway electron (RE) driven kinetic instabilities have been observed in the QUEST spherical tokamak. A strong correlation between decay of the plasma current and activity of kinetic instabilities was first found with quasi-periodic behaviour during current quench. An efficient mitigation of RE by interaction with kinetic instabilities was experimentally demonstrated.

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