Technical Specification for the SPIDER Cs ovens

This technical specification concerns the supply of the Caesium (Cs) oven for the SPIDER experiment that will be hosted in PRIMA facility. The main aim of the SPIDER experiment is to test and optimise the Beam Source that is the core component of the ITER Neutral Beam Injectors. The production of hydrogen (or deuterium) negative ions inside the sources relies mainly on the generation on a caesiated surface with a low work function, which enhances the ion yield and reduces the co - extracted electrons. In the SPIDER beam source fresh Cs has to be injected in a controlled way by means of three Cs ovens. Since the Cs ovens are embedded in the source, their design has to assure vacuum and high temperature compatibility. The present document gives a complementary description of the SPIDER Cs ovens design for their procurement. The document takes care in particular all the precautions to guarantee a good functioning in vacuum environment (e.g.: materials, cleaning, outgassing...). Information for the Cs oven procurement, delivery and acceptance tests are also given. The Supply shall be done in two batches: a Cs oven prototype (Batch A) and 3 Cs ovens (Batch B, series production), after testing of the prototype in vacuum by Consorzio RFX. Based on this Technical Specification, the Supplier shall manufacture, as semble and test the Cs ovens at the factory and then shall deliver them at the PRIMA Site, together with the as built drawings.