2 MV van de Graaff generator being assembled. Central column and top-terminal. The acceleration tube in front of the column is for the spectrometer beam. The acceleration tube for the beam to be injected into the ring is behind the column. Additional keyword: "VAN DE GRAAFF" 41 E: Injection line from the van de Graaff towards the ring (injection from the inside of the ring). F: Ligne d'injection, du van de Graaff vers l'anneau (injection venant de l'intérieur de l'anneau). 42 = 40 43 = 41 * 44 E: Overview of the ring, nearly completed. F: Vue générale de l'anneau, presque fini. 45 = 44