Manufacturing of the full size prototype of the ion source for the ITER neutral beam injector. The spider beam source

Each of the two ITER Heating Neutral Beam injectors (HNBs) will deliver 16.5MW of heating power obtained by the acceleration of a 40A deuterium negative ion beam up to the energy of 1MeV. The ions are generated into a cesiated ion source, where the gas is ionised with a radio frequency electromagnetic field. The largest world experiments for the production of negative ion beam presently operating in IPP Garching is ELISE, which represents the first and bigger step from the small size IPP devices to half of the size of HNB ion s ource. The technology developed in IPP has been applied to the development of another big experiment, SPIDER, which will be the -ion source? test facility for the full size ITER neutral beam ion source. The SPIDER beam source comprises an ion source with 8 radio - frequency drivers and a three grid system, providing an overall acceleration up to energies above 100keV. The beam source will be housed in a vacuum vessel which will be equipped with a beam dump and a graphite calorimeter to diagnose the beam. The manufacturing design of the main parts of the SPIDER Beam source has been completed and also the tests on the prototypes have been successfully passed. The most delicate and complex parts of the ion source and the accelerator, developed by galvanic deposit ion of copper are being manufactured. The parts will be completed by the end of 2014, when the assembling of the challenging device, will start. The paper describes the adaptations operated on the design of the beam source for the fabrication, in particula r also to the engineering development to enable the fulfilment of the tight requirements set in the technical specifications. Moreover the tests performed on the prototypes and the modifications that were implemented are reported.