Who is the author of the term "Coulomb logarithm"? In fact, Coulomb logarithm was computed by Langmuir in his paper of 1928 where the term "plasma" was introduced into physics, but the term "Coulomb logarithm" seemed to appear later. The earliest reference I found is the paper Relativistic kinetic equation by Belyaev & Budker (1956).
UPDATE: I found the term "Coulomn logarithm" in several papers by S.I.Braginsky, V.I. Kogan, and G.I.Budker dated as early as 1951. They are published in a volume of declassified works issued in 1958.