Final design of the diagnostic calorimeter for the negative ion source SPIDER

The Short-Time Retractable Instrumented Kalorimeter Experiment (STRIKE) diagnostic will be used to characterize the SPIDER negative ion beam during short pulse operation (< 10 s) to verify the degree of attainment of ITER requirements about the maximum allowed beam non-uniformity ( 10% is required). After a preliminary design developed in the last few years, the complete STRIKE diagnostic system has been recently subjected to a final review and is now ready for construction. The main components of the system are: an array of 16 tiles made of unidirectional Carbon Fibre Composite (CFC) with the fibre direction parallel to the thickness, which will be exposed to the high power density beam (20 MW/m(2) peak) exiting from the SPIDER Beam Source; a supporting and positioning system, based on a set of structures made of stainless steel, with controlled moving systems, to be installed within the SPIDER vacuum vessel; a set of thermal, electric and thermo-graphic sensors to thoroughly characterize the beam. The development of the engineering design of the supporting and positioning system and an overview of the complete diagnostic system are given.