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PACS:01.60.+q DOI: URL: https://ufn.ru/en/articles/2026/7/f/ Citation: Bykov A M, Dogel’ V A, Zelenyi L M, Zirakashvili V N, Ivanchik A V, Kocharovskii V V, Krymskii G F, Kuzmichev L A, Levenfish K P, Postnov K A, Starodubtsev S A, Yakovlev D G "In memory of Igor Nikolaevich Toptygin" Phys. Usp.69 (7) (2026)