B245 Auxiliary systems

The estimate used in [Williams et al., 1998] for the negative neutral beam system correspond to an efficiency of 29% (108MW beam power out of 367 MW input power). The total mass is dominated by the 20 sources (2.5 t each) which include the filament source, the three-stage accelerator, and the neutralizer. These assumptions correspond to a reduction by about an order of magnitude of the existing systems. Much lower mass estimates have been used in [Cheung et al., 2004]. We assume here a figure of 2.5kg/(kW of injected power). The mass of the auxiliary system is given by

Maux = 2.5 kg/kW Pfus/Q Since Q « 20 we neglect this contribution in the following.

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