Igor Tamm (1895–1971) was a notable Russian and Soviet physicist, best known for his work in the field of plasma physics and controlled thermonuclear fusion. He played a significant role in the development of magnetic confinement fusion devices, including the tokamak, which is a device designed to confine plasma using magnetic fields in order to achieve nuclear fusion. Tamm's contributions to science and technology helped lay the groundwork for future advancements in nuclear physics and energy generation.
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A physicist.[ref]
https://www.nobelprize.org/prizes/physics/1958/tamm/biographical/. Independent professional profile
Portrait of Igor Tamm
. CBS press photograph, identifier ner18397; individual photographer unidentified; existing Commons crop. Commons PD-US-no-notice claim: US publication during 1931–1977 without notice. Other jurisdictions may retain protection., via Wikimedia Commons. Source.