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The ITER project requires at least two Neutral Beam Injectors (NBIs), each accelerating to 1MV a 40A beam of negative deuterium ions, to deliver to the plasma a power of about 33MW for one hour as additional heating. The fulfilment of such demanding performances required the realization of the full size prototype of the negative ion source (SPIDER − Source for Production of Ion of Deuterium Extracted...
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