Igor Tamm student Andrei Sakharov
In 1951, together with Andrei Sakharov, Tamm proposed a tokamak system for the realization of CTF on the basis of toroidal magnetic thermonuclear reactor and soon after the first such devices were built by the  INF. Results from the T-3 Soviet magnetic confinement device in 1968, when the plasma parameters unique for that time were obtained, showed temperatures in their machine to be over an order of magnitude higher than what was expected by the rest of the community. The western scientists visited the experiment and verified the high temperatures and confinement, sparking a wave of optimism for the prospects of the tokamak as well as construction of new experiments, which is still the dominant magnetic confinement device today.
In 1964 he was elected a Member of the German Academy of Sciences Leopoldina.Tamm was a student of Leonid Isaakovich Mandelshtam in science and life.Tamm was an atheist.Tamm died in Moscow, Soviet Union on 12 April 1971, the Lunar crater Tamm is named after him. He is buried at Novodevichy Cemetery.
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