Article révisé par les pairs
Résumé : A proton bombarded target coupled to an ion source is a key-equipment to produce a cyclotron accelerated Radioactive Ion Beam (RIB). This note concerns the target development for a 13N ion beam which will be the first one out of a more general project at Louvain-la-Neuve (Report RIB-1988-01). A 30-MeV proton beam of up to 300-μA intensity from the CYCLONE 30 bombards a graphite target to produce the 13N isotope via the 13C(p, n)13N reaction. Two major problems have to be solved: the extraction and transport of 13N and the beam-heat dissipation. These aspects are somewhat correlated to the temperature dependence of the 13N release and to the heat conductivity of graphite. A disk shaped target can be cooled through its side-face or through its back-face, and in fact both designs are explored. The extraction yield of the first one varies with the beam intensity up to a maximum value of 46% at 170 μA. For the second one, which is presently under development, the target temperature can be adjusted by a cooled finger of variable length. © 1989.