[5] Under the supervision of Yves Rocard, he participated in the construction and start-up of the linear accelerator at Orsay from 1952 until 1960.
[3] At Paris-Sud University, Delcroix created in 1960 a graduate curriculum in plasma physics at the level of the diplôme d’études approfondies (DEA).
[3] Delcroix, in collaboration with Abraham Bers (1930–2015),[6] wrote a two-volume textbook entitled Physique des Plasmas, published in 1994.
[3] From 1965 to 1976 Delcroix was the director of scientific research for the Direction des Recherches et Moyens d’Essai (D.R.M.E.
[3] Beginning in 1975, Delacroix with several colleagues created and maintained GAPHYOR (GAz PHysique ORsay),[2][3] a database and computerized retrieval system for atomic and molecular physics.